Wear Deterioration Research Articles

Study of microstructural evolution during operation of electrically connected components and analysis of failure mechanism

Abstract As a key current-carrying structure of high-voltage bushings, the reliability of electrical connection components is crucial to the safe and stable operation of power equipment. To obtain the microstructural evolution of electrical connection components with different deterioration states, CUD strap contactors were deteriorated in different ways, and electron backscatter diffraction (EBSD) technique was used to test the microstructure of strap contactors with different deterioration states. The results showed that compared to the unused contactors, the contact resistance of the contactors under the combined effect of friction and high temperature increased 203.12 times and was in a failed state. During the process from unused state to wear deterioration, high temperature deterioration, and then to eventual failure of the contactors, the average grain size gradually grows from 8.15 μm to 25 μm, the dislocation density gradually decreases from 2.38×1014 m-2 to 1.04×1014 m-2, and there are a significant proportion of the recrystallized organization. These changes are detrimental to the mechanical properties of the contactors. In addition, the distribution of grain boundaries in the contact area proves the occurrence of over-temperature phenomenon in this area, which will accelerate the deterioration of the contactors and eventually lead to the failure of the component. The relevant conclusions can provide a theoretical basis for the design of electrical connection structure of strap contacts as well as the study of deterioration mechanism.

Tribo-corrosion-fatigue behaviors of the parallel wires of main cable in the suspension bridge

The suspension bridge in service is subjected to the coupling effects of dead load, vehicle load, wind load and corrosive environment. These factors cause the tribo-corrosion-fatigue behaviors of parallel steel wires of main cable, which seriously affect the load-bearing safety of the main cable. Therefore, it is of great significance to investigate tribo-corrosion-fatigue behaviors of steel wires and the saddle materials. The self-made test rig was developed to carry out tribo-corrosion-fatigue tests between the parallel steel wires, and between the steel wire and saddle groove. Tribo-corrosion-fatigue behaviors (friction coefficient, wear profile, failure area, wear mechanism and wear coefficient) of main cable wires was revealed by high speed digital microscope and scanning electron microscope. The results show that the friction coefficient shows a trend of rapid increase – decrease – increase – stabilization. It decreases with increasing contact load as compared to an increase with increasing fatigue load. The wear width and depth both increase nearly linearly with increasing cycles, while the failure area increases nearly parabolically. As the contact load and fatigue load increase, the wear width and depth increase, and the corrosion of wear area is more obvious. The wear coefficient decreases first and then increases with the increase of cycles. The wear mechanisms are mainly adhesive wear, abrasive wear, fatigue wear and corrosion wear. The increase of contact load and fatigue load promotes the wear deterioration behaviors of cable wires. The results have fundamental significance to ensure the load-bearing safety of the main cable and improve the service safety of the suspension bridge.

Improvement of thermal shock resistance and hot mechanical properties by FCC/BCC/B2 multiphase strengthened microstructure in laser cladded high-entropy alloy coatings

NiCoFeCrSiAlxCu0.5TiMoB0.4 high-entropy alloy (HEA) coatings were prepared by laser cladding, and the microstructure, phase structure and thermal properties were studied. The results showed that the solid solution phase of the coating matrix changed from FCC + BCC to BCC as the main phases with increasing Al content. Moreover, the enrichment of Ti resulted in the significant formation of a stacking fault structure in the interdendritic region of the dual-phase coatings. The ordered B2 phase precipitated from the BCC structure exhibited high hardness and crack damage resistance. The wear rates of the HEA-Al0.5 and HEA-Al1.5 coatings at 600 °C were 3.78 × 10−5 and 4.35 × 10−5 mm3/(N·m)−1, respectively. The wear mechanisms of HEA coatings were mainly abrasive wear and oxidation wear. Because of the high microhardness of the BCC phase, cracks initiated and propagated on the worn surface, which aggravated the oxidation wear deterioration of the HEA coating. Overall, this study may provide a theoretical basis for the microstructure-property relationships of HEA coatings and contribute to the development of high-performance coatings.

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete.

Concrete as a building material is susceptible to degradation by environmental threats such as thermal diffusion, acid and sulphate infiltration, and chloride penetration. Hence, the inclusion of nanomaterials in concrete has a positive effect in terms of promoting its mechanical strength and durability performance, as well as resulting in energy savings due to reduced cement consumption in concrete production. This review article discussed the novel advances in research regarding C-S-H gel promotion and concrete durability improvement using nanomaterials. Basically, this review deals with topics relevant to the influence of nanomaterials on concrete's resistance to heat, acid, sulphate, chlorides, and wear deterioration, as well as the impact on concrete microstructure and chemical bonding. The significance of this review is a critical discussion on the cementation mechanism of nanoparticles in enhancing durability properties owing to their nanofiller effect, pozzolanic reactivity, and nucleation effect. The utilization of nanoparticles enhanced the hydrolysis of cement, leading to a rise in the production of C-S-H gel. Consequently, this improvement in concrete microstructure led to a reduction in the number of capillary pores and pore connectivity, thereby improving the concrete's water resistance. Microstructural and chemical evidence obtained using SEM and XRD indicated that nanomaterials facilitated the formation of cement gel either by reacting pozzolanically with portlandite to generate more C-S-H gel or by functioning as nucleation sites. Due to an increased rate of C-S-H gel formation, concrete enhanced with nanoparticles exhibited greater durability against heat damage, external attack by acids and sulphates, chloride diffusion, and surface abrasion. The durability improvement following nanomaterial incorporation into concrete can be summarised as enhanced residual mechanical strength, reduced concrete mass loss, reduced diffusion coefficients for thermal and chloride, improved performance against sulphates and acid attack, and increased surface resistance to abrasion.

Wear failure analysis of ball bearings based on lubricating oil for gas turbine

PurposeBall bearings in gas turbine have played a critical role in supporting heavy radial loads but with higher failure rates and repair costs. Therefore, the purpose of this study is to introduce and study a method for their failure analysis with an actual industrial example to guarantee operation reliability and safety.Design/methodology/approachSpectrometric oil analysis was used as an early abnormal wear indicator, based on which emergent in-use oil replacement was carried out to reduce the wear rate. However, with wear deterioration, further wear failure investigation was conducted by LaserNet Fines and ferrography to detect the imminent wear failure. Finally, with the assistance of elemental analysis of the typical wear particles, the root cause and worn components were determined by scanning electronic microscope and energy-dispersive X-ray spectroscopy.FindingsThe results have shown that an extraneous source led to wear failure, which later caused overheat between the outer bearing ring and ball. It is in accordance with visual inspection of the disassembled engine.Originality/valueThis method has specified the occasion under which the suitable measurement can be taken. It can achieve the rapid wear condition assessment allowing for root cause and worn parts identification. In addition, wear rate reduction by change of oil can be efficient for most of the time to avoid premature disassemble, especially with the possibility of contamination. It has provided experience to address similar industry-level practical wear failure analysis problems.

Remaining Fatigue Life Predictions of Railway Prestressed Concrete Sleepers Considering Time-Dependent Surface Abrasion

One of the safety-critical components of ballasted track systems is railway sleepers whose main functions are to (i) transfer vertical load, (ii) maintain rail gauge, and (iii) restrain longitudinal rail movement. Railway sleepers can be manufactured using timber, concrete, steel, composite, and any other engineered materials. Prestressed concrete sleepers are the most commonly used type worldwide because of their superior value-for-money performance. In practice, railway sleepers experience thousands of cycles of aggressive wheel–rail dynamic loads and wear deterioration can be observed over their service life. Not only does the deterioration affect track quality and geometries, but it also undermines the structural integrity of the track structures. The wear and abrasion directly decrease the capacity of railway sleepers, resulting in the reduction in service life. In this paper, the emphasis is placed on the assessment of the fatigue life of prestressed concrete railway sleepers with imperfect geometry. This study is the world’s first to establish a new fatigue simulation of railway concrete sleepers considering accumulative non-constant amplitudes, which has been validated using full-scale experimental results and empirical analyses. Parametric studies have been conducted to obtain new insights into the fatigue performance of the worn sleepers. The new findings will improve railway sleeper maintenance and inspection criteria, and will provide a new guideline on track-condition monitoring networks.

Reliability modelling of wheel wear deterioration using conditional bivariate gamma processes and Bayesian hierarchical models

Wear of wheel profiles is a common degradation process that significantly impacts the reliability of wheelsets. In this study, a conditional bivariate Gamma process is constructed to characterize wheel wear, and hierarchical Bayesian models are employed to identify the differences in wear between each vehicle within a train. Before computation, the field data are modified by isotonic regression and monotone cubic Hermite interpolants. Due to the failure modes involving flange thickness and wheel diameter difference, the distributions of first-passage times are calculated using an analytical approach and kernel density estimation, respectively. The proposed model is validated with a real-world case study of a train consisting of eight vehicles. The results indicate that the laws of wear vary throughout the train, besides left and right wheels. Based on the results, conclusions can be drawn that the first and last vehicles in a train have higher mean wear rates than others, and that different vehicles have different levels of reliability during different stages; the early failure rates are close to zero, but they rapidly increase in the late stage.

Hierarchical mode optimization strategy for gear engagement process of automated manual transmission with electromagnetic actuator

When vehicles equipped with automated manual transmission (AMT) are in the gear engagement process (GEP), the problems of longitudinal shift jerk and synchronizer wear deterioration is prominent, which seriously affects the GEP quality. This paper develops and evaluates a hierarchical mode optimization strategy (HMOS) for GEP. Firstly, the models of gear-shift actuator and three-stage GEP are established, and the correlation between sleeve displacement and cone torque is revealed based on the established models. Next, the HMOS is proposed for cone torque optimization and sleeve trajectory tracking during GEP. At the top layer of the HMOS, a novel sliding-mode predictive controller (SMPC) with constraints is proposed for the cone torque decision during the synchronization stage of the GEP. At the bottom layer of the HMOS, an MPC-based sleeve trajectory tracking controller integrated with a load torque disturbance observer (L-DOB) is presented. Finally, the simulation and hardware-in-the-loop (HIL) test are carried out in a driving condition of power upshift from the first gear to the second gear to verify the performance of the optimization strategy. The verification results show that the proposed optimization strategy achieves satisfactory longitudinal shift jerk, synchronizer sliding work, and thermal stress.

FDC Based on Neural Network With Harmonic Sensor to Prevent Error of Robot

In order to further improve the productivity of manufacturing equipment, it is indispensable to monitor the conditions of all the manufacturing equipment and not just the processing chambers. In this paper, we present a robust machine learning based deterioration diagnosis technology with harmonic sensor, which has frequency characteristics that have high sensitivity to deterioration and low sensitivity to torque. The robust deterioration diagnosis using a small amount of data is possible by limiting the input data to be trained and inferred to signals and motion patterns, and inferring with neural network models that do not require developments for manufacturing equipment. The example of wafer transfer robots in the ion implanter and the Low-Pressure Chemical Vapor Deposition (LP-CVD) and the coater/developer show that wear deterioration of machine components can be detected from the level of deterioration output and it is possible to prevent errors of the wafer transfer robots because of maintenance based on increases in the level of deterioration.

Carburization and wear behavior of self-lubricating Ti(C,N)-based cermets with various secondary carbides

Self-lubricating Ti(C,N)-based cermets were manufactured using vacuum sintering and solid carburizing in this study, and the effects of various carbides on the carburization and wear behavior of the cermets were investigated. The findings demonstrate that solid carburizing resulted in strong graphite precipitation in all the Ti(C,N)-based matrices. Refractory carbides significantly affect the morphological characteristics of graphite in cermets. The activated carbon atoms in the cermet matrix are consumed in two ways: rearrangement followed by precipitation in the form of graphite and combination with metal atoms followed by precipitation in the form of carbides or carbonitrides. As the amount of refractory carbide dissolved in the binder phase increases, more carbon atoms are consumed by bonding with metal atoms, and less graphite is precipitated. The precipitation of carbides and carbonitrides in the ceramic phase increases the rim phase thickness. After carburization, the mechanical properties of the cermets were noticeably degraded owing to the introduction of graphite and the coarsening of ceramic particles. However, the presence of graphite significantly reduced the friction coefficient of the cermet material owing to its good lubrication effect. The decreased mass loss and better wear morphology suggest that the wear deterioration of all the cermets is remarkably mitigated by carburization. The wear properties of cermets are determined by the mechanical properties and the lubrication conditions of the contact surfaces, and good lubrication conditions can partially compensate for the degradation of the mechanical properties of cermets in the sliding wear process.

A three-dimensional finite element analysis of concrete sleepers and fastening systems subjected to coupling vertical and lateral loads

At horizontal railway curves, the rail is typically a subject to both vertical and lateral wheel loads. The underestimated influence of lateral load at such locations in the design process could compromise the structural integrity of the whole railway track system. Rail-seat deterioration and damage of fastening system components are two possible failure mechanisms associated with high lateral loadings that could lead to safety concerns and costly maintenance activities. It is, therefore, of high importance to analyse the track response including concrete sleepers and fastening systems to coupling vertical and lateral loadings. For such end, a three-dimensional finite element railway model was created and subjected to a variety of lateral to vertical loading ratios. Of other elastic fastening systems, the Skl-style (W14) fastening system, which is currently of high demand, was accounted for as a result of it has been barely researched. The finite element model was rigorously verified with the experimental works and classical theories found in the previous knowledge. The finite element outputs could investigate the complex structural behaviour of railway concrete sleepers and fastening systems and the transmission mechanism of the lateral loading through the track system. The findings indicated that the concrete-rail pad interface is significantly influenced by the high lateral to vertical loading ratio which produces localized contact area of high compressive stress; however, the influence of lateral load on the produced stresses of both tension clamps and angled guide plates is minimal. Further, lateral sliding at concrete-rail pad interface was apparent even at low lateral load, increasing the possibility of wear deterioration of the contacting surfaces. Lastly, the gap between the field angled guide plate and the rail base is a critical parameter that influences the lateral load path and failure mechanisms. The outcomes of this research would lead to better insight into the influences of lateral wheel load more clearly and thus contribute to improvements in the current design practices of concrete sleepers and fastening systems at demanding locations.

A biocompatible Pd-based BMG with excellent corrosive-wear resistance for implant applications

The mechanical properties, electrochemical behavior, wear and corrosive-wear performance of a Pd40Cu30Ni10P20 bulk metallic glass (BMG) were studied. It is found that the Pd-based BMG shows high hardness of over 500 HV, which is superior to that of conventional biomedical alloys, like the CoCrMo alloy, 316 L stainless steel (SS), and Ti6Al4V alloy. The Pd-based BMG possesses a great corrosion resistance in the phosphate buffer saline (PBS) solution, which is ascribed to the formation of a highly-protective Pd-enriched sub-surface structure. The Pd-based BMG exhibits the greater dry- and corrosive-wear resistance than that of traditional crystalline biomedical alloys studied in this work. This trend can effectively ensure the working longevity of the Pd-based BMG as orthopedic implant. The triobocorrosion experiment results illustrate that the extremely high corrosive-wear resistance of the Pd-based BMG can be attributed to the high passivation capacity during wet sliding. The possible mechanism of the corrosion-accelerating wear deterioration is discussed, which provides the guidance for the improvement in the corrosive-wear resistance of Pd-based BMGs for their potential biomedical applications.

Influence of the gamma irradiation dose on tribological property of polytetrafluoroethylene

Abstract In this study, the evolution of structure, nanomechanical and tribological properties of polytetrafluoroethylene (PTFE) induced by gamma-ray irradiation with dose up to 20 MGy were investigated, and the frictional failure mechanism after irradiation was also discussed. The structural analyses reveal that the crystallinity degree of PTFE increases significantly with the increase of irradiation dose. The functional groups of COOH, C C and -(CH2)n-are produced due to surface chemical reaction induced by irradiation above 5 MGy dose. High density cracks appear on the surface and both the length and width of the crack propagate with the increase of irradiation dose. Both the nanohardness and Young's Modulus of the irradiated PTFE increase significantly when the irradiation dose is lower than 5 MGy. Further exposure leads to the decrease of nanohardness. The mean friction coefficient increases from 0.035 to 0.12 after 0.3 MGy irradiation and turn to saturation with further increasing irradiation dose. However, after 5 MGy gamma-ray irradiation, the wear rate of PTFE increases significantly, the present of crack on the surface and subsurface accelerates the peeling of the bulk material during the sliding process and results in the wear deterioration.

Nonlinear finite element analysis for structural capacity of railway prestressed concrete sleepers with rail seat abrasion

Abstract Prestressed concrete sleepers are the most commonly used type of railway sleepers in ballasted railway track. They have a strong influence on track performance, track stiffness and railway safety. Reportedly in many railway lines (especially in heavy-rail networks), many prestressed concrete sleepers have failed due to rail seat abrasion (RSA). RSA is a wear deterioration of the concrete underneath the rail that results in various problems such as loss of fastening toe load, gauge variation, improper rail cant, and eventually loss of rail fastening. In addition, the RSA will directly decrease the capacity of worn concrete sleepers. However, to the best of authors' knowledge, there were very few studies that quantitatively examined the effects of RSA on the structural capacity of the prestressed concrete sleepers. In this paper, a numerical study is executed to evaluate the load-carrying capacity of a prestressed concrete sleeper using LS-DYNA. The nonlinear model was validated firstly based on both theoretical analyses and experimental results in accordance with Australian Standard. Using the validated finite element model, the influences of different wear depth of RSA are investigated; and different compression strength and tensile strength of concrete and the prestress losses are highlighted. The outcomes of this study lead to better insight into the influences of RSA more clearly and improve track maintenance and inspection criteria.

Stability of Metal Matrix Composite Pads During High-Speed Braking

Metal matrix composites are now commonly used as braking pads for the train running over 250 km/h by virtue of a number of desirable properties. To develop a fundamental understanding of the stability of metallic composites at high-speed braking, four typical composite materials, with different Cu and Fe contents, were subjected to a series of high-speed emergency braking at a simulative running speed of 380 km/h and a braking inertia of 27 kg/m−2 and a normal pressure of 1.27 MPa in this paper. The results showed that the sample with higher Cu content displayed a fade COF and deteriorated wear, but the one with higher Fe content could maintain a stable COF and low wear rate. The tribological behaviour is associated with the relative rate of generation and consumption of the tribo-oxide film. For the sample with higher Cu content, the generation rate of tribo-oxide film was less than the consumption rate, and the COF fading and wear deterioration with the increasing braking times were attributed to the reduction in resistance to deform or to shear the asperities, which was thought to be caused by the degradation of near-surface layer due to the removal of protective tribo-oxide film. In contrast, for the sample with higher Fe content, the generation rate was approximately equal to the consumption rate, and a well-established tribo-oxide film on the surface was responsible for the stable friction level and low wear rates.

Tribocorrosion behaviors of a biodegradable Mg65Zn30Ca5 bulk metallic glass for potential biomedical implant applications

In this study, the tribological behavior of Mg65Zn30Ca5 BMG under dry friction in air and lubrication friction in phosphate buffered saline (PBS) solution were investigated using ball-on-disk reciprocating sliding. The results were compared with those of AZ31B alloy and pure Mg. The Mg65Zn30Ca5 BMG exhibits the highest dry wear resistance among three Mg-based alloys. Nevertheless, under lubricated sliding in PBS solution, the wear rate of Mg65Zn30Ca5 BMG and pure Mg increases whereas that of AZ31B decreases in comparison with the cases under dry friction. The electrochemical results suggest that the corrosion resistance of Mg-based alloys in PBS solution decreases in the following consequence: AZ31B, Mg65Zn30Ca5 and pure Mg, which results in an accelerated wear rate of Mg65Zn30Ca5 and pure Mg during sliding in PBS solution. The tribocorrosion results demonstrate that the tribological contact decreases the corrosion potentials and increases the corrosion current densities of Mg-based alloys. The tribocorrosion of Mg-based alloys is dominated by their corrosion current density. The possible mechanism of synergistic effects of corrosion and wear deterioration is discussed. The present study provides the hints for the design of wear-resistant Mg-based BMGs for further orthopedic applications.

Grinding wheel redress life estimation using force and surface texture analysis

Grinding characterized by low material removal rate and high surface finish is an abrasive machining process. Geometrically undefined grits of grinding wheel influences part surface finish. Cutting edges worn out during grinding are retained by timely dressing. Operators on shop floor decides on the dressing interval based on end of wheel life such as burns, chatter marks and deterioration in the workpiece surface finish. Incorrect dressing of grinding wheel increases unnecessary machining time and wheel wastage. The present work defines the usefulness of grinding force signal and ground surface texture analysis in the estimation of grinding wheel redress time. Grinding experiments were performed in surface grinding machine with white Alumina wheel on D2 tool steel specimen. During the experiments, the force signals were acquired from 9257B Kistler dynamometer, for each grinding pass with 16 KHz sampling frequency. Ground workpiece surface images were captured using multi-sensor Coordinate Measuring Machine (CMM). Experiments were continued till the grinding wheel reaches its end of life. Grinding force signal features prominent to the assessment of grinding wheel deterioration in time, frequency and time-frequency domains were extracted based on prognostic metric evaluation. Hough transform based image texture features were also extracted. The test results depict that a good correlation exists between grinding force signals and ground surface images in measuring the wear deterioration level and thus the ground surface features can be considered as an explicit criterion in the redress life estimation of the grinding wheel.

Effects of noble elements on the glass-forming ability, mechanical property, electrochemical behavior and tribocorrosion resistance of Ni- and Cu-free Zr-Al-Co bulk metallic glass

In this study, the influences of Pd, Au and Pt on the glass-forming ability (GFA), mechanical property, electrochemical behavior and tribocorrosion resistance of the Ni- and Cu-free Zr53Al16Co31 bulk metallic glass (BMG) were investigated. Alloying of noble elements enhances the GFA and the Zr53Al16Co26M5 (M = Pd, Au and Pt) BMGs with a diameter of 5 mm can be fabricated by copper mold casting. The ZrAlCo-based BMGs show a good combination of mechanical properties with a high yield strength of over 2000 MPa, low Young's modulus of about 93 GPa and high hardness of over 550 HV. Pd, Au and Pt take a significant influence on the corrosion resistance of the ZrAlCo-based BMGs in phosphate buffer saline (PBS) solution. The ZrAlCoPt alloy exhibits the highest corrosion resistance whereas ZrAlCoAu displays the lowest one, which can be correlated with their Zr and Al concentration in the surface passive film of alloys. The ZrAlCo-based BMGs illustrate a lower wear resistance in PBS solution than that in air, which is attributed to the synergistic effects of abrasive and corrosive wear. The wear resistance of ZrAlCo-based BMGs in PBS solution highly corresponds to their corrosion resistance. The ZrAlCoPt alloy demonstrates the highest tribocorrosion resistance while ZrAlCoAu shows the lowest one among these four ZrAlCo-based BMGs. The possible mechanism of corrosion accelerating wear deterioration is discussed, which provides the guidance for the improvement in the tribocorrosion resistance of Zr-based BMGs for their promising biomedical applications.

Gear wear monitoring by modulation signal bispectrum based on motor current signal analysis

Gears are important mechanical components for power transmissions. Tooth wear is one of the most common failure modes, which can present throughout a gear’s lifetime. It is significant to accurately monitor gear wear progression in order to take timely predictive maintenances. Motor current signature analysis (MCSA) is an effective and non-intrusive approach which is able to monitor faults from both electrical and mechanical systems. However, little research has been reported in monitoring the gear wear and estimating its severity based on MCSA. This paper presents a novel gear wear monitoring method through a modulation signal bispectrum based motor current signal analysis (MSB-MCSA). For a steady gear transmission, it is inevitable to exist load and speed oscillations due to various errors including wears. These oscillations can induce small modulations in the current signals of the driving motor. MSB is particularly effective in characterising such small modulation signals. Based on these understandings, the monitoring process was implemented based on the current signals from a run-to-failure test of an industrial two stages helical gearbox under a moderate accelerated fatigue process. At the initial operation of the test, MSB analysis results showed that the peak values at the bifrequencies of gear rotations and the power supply can be effective monitoring features for identifying faulty gears and wear severity as they exhibit agreeable changes with gear loads. A monotonically increasing trend established by these features allows a clear indication of the gear wear progression. The dismantle inspection at 477h of operation, made when one of the monitored features is about 123% higher than its baseline, has found that there are severe scuffing wear marks on a number of tooth surfaces on the driving gear, showing that the gear endures a gradual wear process during its long test operation. Therefore, it is affirmed that the MSB-MSCA approach proposed is reliable and accurate for monitoring gear wear deterioration.

Tribological and corrosion behaviors of Mg56.5Cu27Ag5Dy11.5 bulk metallic glass in NaCl solution

In this study, the tribological behaviors of Mg56.5Cu27Ag5Dy11.5 bulk metallic glass (BMG) in air and NaCl solution were investigated using ball-on-disk reciprocating friction. The Mg56.5Cu27Ag5Dy11.5 BMG exhibits higher strength and hardness than those of commercial AZ31B alloy and pure Mg. The wear rate of the Mg56.5Cu27Ag5Dy11.5 in air is 3.8×10−7mm3·mm−1·N−1, which is superior to those of AZ31B alloy (7.3×10−7mm3·mm−1·N−1) and pure Mg (6.5×10−7mm3·mm−1·N−1). The wear mechanism of Mg56.5Cu27Ag5Dy11.5, AZ31B, and pure Mg sliding in air is dominated by oxidation and abrasive wear. The wear rates of alloys in NaCl decrease in the following order: 8.3×10−7mm3·mm−1·N−1 for pure Mg, 6.3×10−7mm3·mm−1·N−1 for AZ31B, and 5.4×10−7mm3·mm−1·N−1 for Mg56.5Cu27Ag5Dy11.5. The Mg56.5Cu27Ag5Dy11.5 and pure Mg demonstrate inferior corrosion resistance in NaCl to that of AZ31B. Thus, the Mg56.5Cu27Ag5Dy11.5 and pure Mg subject to tribocorrosion controlled by synergistic effects of abrasive and corrosive wear, which results in a large wear rate during sliding in NaCl. The possible mechanism of corrosion accelerating wear deterioration is discussed, which provides the guidance for the improvement in the tribocorrosion resistance of Mg-based BMGs for further load-bearing applications.