Deformation Wear Research Articles

Tribological behaviour of AZ91D/ultra-high-temperature ceramic composites at room and elevated temperatures

In this research work, the tribological behaviour of an AZ91D alloy and its composites reinforced with different titanium-based ultra-high-temperature ceramic particulates was investigated. Titanium-based ultra-high-temperature ceramic materials (5 wt%) such as titanium carbide, titanium boride and titanium nitride was used for the fabrication of three different composites, namely ATC, ATB and ATN, respectively. The proposed composites were prepared using a novel ultrasonic treatment-assisted stir-squeeze casting technique. Material characterization was performed using scanning electron microscopy and X-ray diffraction techniques. The porosity and hardness of the composites were determined prior to the wear test. In the pin-on-disc tribometer, the wear test was carried out at room temperature by varying the normal load (12.5–50 N) and the sliding speed (0.25–1 m/s). In addition, at a temperature of up to 200 °C, the tribological behaviour of the composites was assessed. The homogeneous distribution of ultra-high-temperature ceramic particles in the matrix was confirmed by the analysis of the microstructure using scanning electron microscopy images. The X-ray diffraction results showed that the reinforcement materials in the matrix were thermally stable. The hardness of the ATC, ATB and ATN was improved by approximately 31%, 33.8% and 29.6%, respectively. In comparison, at all wear testing conditions, ATB demonstrated superior tribological performance, while the performance of ATN was poor and ATC was moderate. Abrasion, oxidation and delamination were the wear mechanisms at room temperature. At elevated temperatures, oxidation, delamination, thermal softening and plastic deformation wear mechanisms were significant..

Investigation on the impact wear behavior of 2.25Cr–1Mo steel at elevated temperature

The impact wear test of 2.25Cr–1Mo steel against Gr5C12 alloy was performed at a controlled kinetic energy impact wear rig. The effect of temperatures (from 25 °C to 450 °C) on the impact wear damage mechanism was investigated. The contact force, energy absorption, and interface deformation during the impact process were recorded and analyzed in real time. Wear volume, morphology, and elemental distribution of the wear scars were used to characterize wear and tribo-chemistry behavior. Results demonstrate that at varied temperatures, the interface behavior of 2.25Cr–1Mo steel is different. With the rise in temperature, both the contact force, absorption energy, and wear volume first increase and then decrease. The explanation is that higher temperatures can modify the material's surface properties. Delamination, plastic deformation, and oxidative wear are the major mechanisms of impact wear, but the proportions of the three wear mechanisms differ at varied temperature.

A Novel Application on the Drive Elements of Using Electrical Contact Resistance and Friction Coefficient for Evaluating Induction Heat Treatment.

The load on drive elements under extreme pressure conditions is significantly larger than that used in machine tools. When operating under a heavy load for a long period, large deformation and severe wear between the ball and the track are more likely to occur. To reduce wear, the most fundamental solution is to improve the surface properties of the material. Moreover, heat treatment is the most effective method to improve the surface properties of materials, thereby achieving wear resistance and low friction. It is necessary to develop a new heat treatment technology for wear resistance in extreme pressure conditions. Therefore, this study conducted experiments using a reciprocating friction tester. The responses of electrical contact resistance and the friction coefficient were measured synchronously to investigate wear resistance and low friction of the alloy steels after the induction heat treatment. Then, the results were compared and verified with low-carbon alloy steel after the traditional carburizing heat treatment. The experimental results show that the application of new induction heat treatment technology can not only improve the performance of drive components, but also save time and energy, and streamline the production process of the drive components. Therefore, the results of these wear analyses confirm that the induction heat treatment mode can replace the traditional carburizing heat treatment mode for drive elements.

Depth of Penetration and Surface Roughness Analysis of Al6061 cut by Abrasive Water Jet

In this study, model equations to predict average surface roughness value of abrasive water jet cut aluminium 6061 alloy are developed. Model equations are developed considering water jet pressure, abrasive flow rate and traverse speed of the jet. Model equations help in knowing average surface roughness value on the cutting and deformation wear regions. 27 abrasive water jet cutting experiments are conducted on trapezoidal shaped aluminium 6061 block. Depth of penetration values are found for all experimental cutting conditions. Average surface roughness values are found by non-contact surface roughness tester. Surface roughness testing is carried out along the length of depth of penetration. Low and high average surface roughness values are noticed on the cutting and deformation wear regions respectively. Smooth surface finish and rough surface finish with striations are observed on the cutting and deformation wear regions respectively.

Erosion Wear Characteristics of Rock Eroded Using Abrasive Air Jet at 90° Impingement Angle

An abrasive air jet, which is sufficiently powerful to break rock, has significant potential in the field of assisted rock breaking, such as assistive tunnel excavation using a tunnel boring machine. To make its application more efficient and beneficial, a clear and definite erosion mechanism of an abrasive air jet is necessary. However, the present erosion mechanisms of an abrasive air jet have mostly neglected the secondary erosion of rebounding particles. The effect of rebounding particles on rock erosion was analyzed by numerical simulation and scanning electron microscopic images. We obtained a variety of stresses and the distribution when a perpendicular abrasive air jet erodes rock through smoothed particle hydrodynamics (SPH). In addition, the particle trajectory and a variety of velocities were also obtained, which provide the data necessary to analyze the formation and characteristics of the erosion pits. It can be concluded that the rebounding abrasive particles play an indispensable role in the stress formation and distribution of rock, and are also the primary cause of a particular erosion pit feature, that is, a semi sphere-like bottom, under an annular platform. The incident abrasive at the center of an air jet deepens the erosion pit with a large impact force and its energy propagates into the rock with a stress wave. Meanwhile, the rebounding abrasive enlarges the diameter of both the erosion pits and the semi sphere-like bottom. Because the diameter of an erosion pit is larger than that of a semi sphere-like bottom, an annular platform is formed. The incident abrasive at the jet boundary involves the formation of an annular platform. The incident and rebounding abrasives have different roles in the erosion wear of rock. The main wear characteristics of the rock are cutting and deformation wear. The incident abrasive with a high velocity induces the deformation and cutting wear at the semi sphere-like bottom. Only a cutting wear can be induced at an annular platform by an incident abrasive with a lower velocity. The rebounding abrasive induces the cutting wear of the rock only. However, the features of an erosion rock surface vary depending on the eroding angle of the rebounding abrasive.

Evaluation of Forging Die Defect by Considering Plastic Deformation and Abrasive Wear in a Hot Forged Axle Shaft

In the hot forging process, an abrasive wear is a major problem in the manufacturing process which may possibly happen together with the plastic deformation. Both effects are difficult to distinguish in the real tooling. Finite Element Modeling (FEM) is a tool that use to simulate those phenomena in the hot forging process. However, some unknown factors are not directly obtained from the actual measurement. Thus, the sensitivity analysis is applied together with FEM to approximate those parameters. This research was to evaluate the die defects of the hot forged axle shaft process which were the plastic deformation and the abrasive wear. The reliable simulation modeling was developed by conducting the sensitivity analysis of the unknown parameters; heat transfer and friction coefficient, and compared the results with the experimental results. Then, the evaluation of the defects was performed by considering the effect of the plastic deformation and abrasive wear separately. The plastic deformation would be determined by comparing the effective stress with the yield strength of the die material at the same temperature. To predict abrasive wear in 3D space the die profile from the actual process was measured by CMM and then it was compared with that obtained by FEM. Archard’s model was used to predict the abrasive die wear in FEM. The variation of the K-values was significant to the wear prediction. According to this study, the average K-value obtained from different positions gives the best representative than considering only a single point K-value.

Microstructure and Properties of Copper–Graphite Composites Fabricated by Spark Plasma Sintering Based on Two-Step Mixing

The microstructure and properties of Copper-Graphite Composites (CGC) prepared by spark plasma sintering (SPS) based on two-step mixing and wet milling were investigated. The results showed that Cu powders were rolled into Cu flakes during milling, and their size significantly decreased from 23.2 to 10.9 μm when the graphite content increased from 1.0 wt.% to 2.5 wt.%. The oxidation of Cu powder was avoided during two-step mixing and wet milling. After spark plasma sintering, the graphite powders of the composites were mainly distributed at Cu grain boundaries in granular and flake shapes. The mean size of Cu grains was 9.4 um for 1.0 wt.% graphite content and reduced slightly with the increasing of graphite content. Compared with other conventional methods, the composite prepared by two-step mixing and SPS achieved higher relative density, electrical conductivity, and micro-hardness, which, respectively, reduced from 98.78%, 89.7% IACS (International annealed copper standard), and 64 HV (Vickers-hardness) to 96.56%, 81.3% IACS, and 55 HV when the graphite content increased from 1.0 wt.% to 2.5 wt.%. As the graphite content increases, the friction coefficient and wear rate of the composite decreases. When the graphite content of CGC is 1.0 wt.%, the main wear mechanism was plastic deformation, delamination, adhesive, and fatigue wear. The adhesive and fatigue wear disappeared gradually with the increasing of graphite content.

Improving the abrasion resistance of pearlitic steels by high-temperature hardening and cold treatment

The influence of high-temperature quenching and cold treatment on the amount of residual austenite, its stability and ability to deformation martensitic transformation, hardening and wear resistance during the abrasive wear of pearlite grade 150KhNML carbon steel is studied. It is shown that maximum wear resistance during abrasive wear is ensured by a structure consisting of metastable residual austenite and martensite. Such a microstructure is created by high-temperature hardening before testing: during operations, austenite on the working surface, as a result of abrasive particles, turns into dispersed and nanocrystalline martensite with a high level of frictional hardening. This also results in the operability of the secondary steel microstructure due to the micro-TRIP effect. An additional means for increasing abrasion resistance is cold treatment after high-temperature hardening, which provides an increase in carbon martensite cooling before testing for wear resistance and the formation of new portions of carbon martensite deformation during testing.

Influence of Crystallographic Orientation on Nanoscale Friction and Wear Mechanisms of the AZ91 Alloy

In the present study, nanoscale friction and wear behavior of the AZ91 alloy with respect to crystallographic orientations (basal, pyramidal and prismatic) were examined. The hardness of different crystallographic orientation was measured using nanoindentation. Load-dependent friction and wear behavior was investigated using atomic force microscopy (AFM). Electron back scattered diffraction (EBSD) was used to investigate the deformation behavior post-indentation and wear. A strong anisotropy in hardness, friction and wear with respect to crystallographic orientation was observed. The basal oriented grain was found to be most wear-resistant followed by prismatic and pyramidal oriented grains. The friction results corroborated the wear data. Additionally, the model proposed by Song et al. has been used to quantify the orientation dependence of friction values. Finally, it is anticipated that these results will enable the development of orientation informed surfaces for controlling the wear and friction response of materials.

A State-of-the-Art Review on the Wear of the Occlusal Surfaces of Natural Teeth and Prosthetic Crowns

This review focuses on the wear mechanisms of natural and restorative dental materials, presenting a comprehensive description and analysis of the works published in the last two decades on the wear at the interface of occlusal surfaces. Different groups of tribological pairs were considered: tooth-tooth, tooth-restorative material (tooth-ceramic, tooth-resin-based-materials, and tooth-metal), and restorative-restorative materials. The lack of standardization of the wear tests impairs the direct comparison of the obtained results. However, it was possible to infer about the main wear mechanisms observed on the different classes of dental materials. Concerning ceramics, their toughness and surface finishing determines the wear of antagonist tooth. Abrasion revealed to be the main wear mechanisms at occlusal interface. In the case of resin-based composites, the cohesion of the organic matrix and the nature, shape, and amount of filler particles greatly influences the dental wear. The protruding and detachment of the filler particles are the main causes of abrasion of antagonist enamel. Metallic materials induce lower wear on antagonist enamel than the other classes of materials, because of their low hardness and high ductility. Most of the studies revealed plastic deformation and adhesive wear as the main wear mechanisms. Overall, more research in this area is needed for a better understanding of the mechanisms involved at the occlusal surfaces wear. This would be essential for the development of more suitable restoration materials.

Polyethylene Wear With Ceramic and Metal Femoral Heads at 5 Years: A Randomized Controlled Trial With Radiostereometric Analysis

BackgroundA common bearing combination in total hip arthroplasty today is a metal femoral head articulating with polyethylene in the cup. Ceramic heads are thought to be more resistant to third-body damage, and have better wettability and decreased surface roughness, which taken together have been suggested to result in less polyethylene wear. The purpose of this study is to compare the initial creep deformation and follow wear pattern, using radiostereometric analysis, of ceramic and metal femoral heads that articulate with a modern highly cross-linked polyethylene cup liner. MethodsFifty patients with primary osteoarthritis and scheduled for an uncemented total hip arthroplasty were randomized 1:1 to either a ceramic (BIOLOX delta) or a metal (CoCr) femoral head. The patients were followed up for 5 years with repeated radiostereometric analysis examinations (postoperatively, then at 14 days, 3, 12, 24, and 60 months), as well as a hip-specific outcome questionnaire. ResultsDuring the first 3 months both groups showed expected creep within the liner of 0.12 mm (standard deviation 0.03) for the ceramic and 0.08 mm (standard deviation 0.02) for the metal heads. Between 3 months and 5 years there was very little wear of the liner in either group, corresponding to 0.003 mm/y for ceramic and 0.007 mm/y for metal heads. There was no difference in cup migration or clinical outcome between the groups and no cups were revised. ConclusionWith the introduction of modern highly cross-linked polyethylene, the ceramic head demonstrates no superiority when it comes to either early deformation or polyethylene wear compared with the metal head.

Study of surface integrity of milled gamma titanium aluminide

This paper presents a comprehensive investigation of the effects of cutting parameters on the surface integrity of milled γ-TiAl alloys. Surface topography, surface roughness, surface defects, plastic deformation, micro-hardness, chip morphology, and tool wear of the milled γ-TiAl alloys were analyzed. The results indicate that the feed rate had the greatest influence on the surface topography and surface roughness. The value of surface roughness increased with the increase in cutting depth and feed rate. However, with the increase in cutting speed, it initially increased and then decreased. The minimum surface roughness was found to be 0.066 μm. The thickness of the plastic deformation layer and the micro-hardness value increased with the increase in cutting depth and feed rate. Also, they initially increased and then decreased with the increase in cutting speed. The minimum thickness of the plastic deformation layer was 15 μm and the depth of the hardened layer on the processed surface varied between 55 and 70 μm. The chip morphology was closely related to the quality of the processed surface. When the cutting depth and feed rate decreased, the chip morphology was transformed from segmented to nearly smooth. When the cutting depth and feed rate reached a critical point, plastic processing of γ-TiAl was achieved. Compared to brittle deformation, a more favorable processed surface was obtained. Finally, the comparison tests of tool wear were carried out with dry and flood coolant cutting. When the cutting speed reached 120 m/min in dry cutting, the tool life was very poor, and the cutting distance was only 1 m. However, the tool life was generally good when cutting with low cutting speed under the following conditions: vc = 60 m/min, ap = 0.1 mm, and fz = 0.01 mm/tooth. Under these conditions, the cutting distance was 60 m in dry cutting with the tool wear of 0.2 mm and 120 m in flood coolant cutting with the tool wear of 0.1 mm. The tool life in flood coolant operation was better than that of dry operation. The tool life decreased to 30 m when cutting with high cutting speed or feed rate (ap = 0.25 mm or fz = 0.025 mm/tooth).

Influences of grain size and temperature on tribological characteristics of CuAlNi alloys under nanoindentation and nanoscratch

The mechanical response of CuAlNi nanocrystalline under the nanoscratch through an abrasive tip sliding on the workpiece is investigated using molecular dynamics (MD) simulation. The influences of the grain size, alloy composition, temperature and scratch speed on the plastic deformation characteristic and wear mechanism are surveyed. The results represent that increasing the grain size leads to higher force and hardness, which suggests the reverse Hall-Petch relationship. Meanwhile, the indentation and scratch forces tend to increase when reducing the Cu content and temperature, increasing the scratch speed. The deformation behavior exhibits that grain boundaries play a key role in inhibiting the spread of strain and stress. The results show that the stress and strain are concentrated not only in the contact region between the abrasive tip and substrate but also in the grain boundary and adjacent grain boundary areas. Notably, the sliding, twisting of grain boundary and the fusion of grains are a significant mechanism in the deformation behavior of polycrystalline, resulting in the dislocation is strongly developed in the grain boundary. Furthermore, the movement of atoms in various directions leads to different morphology of pile-up. From quantitative results of the special wear rate show that the ability to lose material volume is larger with Cu86Al11Ni3 alloy and at a temperature of 600 K, as well as the polycrystalline is higher than the single-crystalline. Finally, the residual depth ratios exhibit more strain recovery at the grain size of 6.17 nm and lower temperature.

Exploration on tribological behaviour of coumarin as copper rolling oil additive through surface characterization

Tribological performance of coumarin in copper rolling oil was studied by four-ball tests and cold rolling tests. Then a systemic investigation on surface topography and surface chemistry of rolled strips was performed by field emission scanning electron microscope (FE-SEM), laser scanning confocal microscopy (LSCM), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy (Raman). Results showed that coumarin was a kind of potential lubrication additive. The average friction coefficient (AFC) and wear scar diameter (WSD) were reduced by 30.2% and 30.1%, respectively, when the optimum concentration of coumarin (2.0 wt%) was added in copper rolling oil. Meanwhile, as the formation of tribofilm during rolling process, the nonuniform deformation and adhesive wear were effectively inhibited. Thinner copper strips with fine surface quality were obtained. The surface average roughness (Sa) of rolled copper strips was reduced by up to 68.8%. Surface characterization showed that the carbonyl group in coumarin molecule connected to Cu atoms with its molecular plane vertical or tilted to the metal surface. Besides, thermal analysis disclosed that this tribofilm had negligible surface residuals, especially when coumarin concentration was lower than 3.0 wt%.

Investigation of Tribological and Corrosion Behavior of Cu-Ti Alloy Processed by Multiaxial Cryoforging

Wear and corrosion properties of Cu-3%Ti alloy subjected to multiaxial forging (MAF) under cryogenic conditions are estimated at room temperature. Wear study was performed using pin-on-disk dry sliding wear setup at 10 and 20 N loads with varying sliding distances (500-3000 m) under different sliding velocities (1 and 2 m/s). Coefficient of friction and wear mass loss decreases with an increase in MAF cycles, due to increases in hardness of samples. Wear resistance decreases with an increase in load and sliding velocity. Worn surface shows the plastic deformation regions, wear track, micro-cracks, micro-plowing groove and scratches. Potentiodynamic polarization test clearly shows that current density (Icorr) increases with an increase in MAF passes, because of grain refinement. Reduction in corrosion rate was evident from electrochemical impedance spectroscopy results which show increased diameter of the capacitive arc. An enhancement of corrosion resistance was revealed at higher MAF passes.

Optimal Design of Cash Circulation Module Gear for Financial Machinery Based on Tribology

To achieve the characteristics of the cash cycle module of a financial machine, such as a compact transmission mechanism, high transmission accuracy, large torque, high rotation speed, high service temperature, no lubrication, and long service life, this work presented a solution to optimize the tooth shape of a thermoplastic gear and the design of a thermoplastic gear with a limit pressure angle of 35°. Through the modeling and simulation analysis of the factors affecting the life of the gear, it was found that the gear with the improved tooth profile was superior to the control gear without the improved tooth profile in terms of sliding wear of the tooth surface, thermal deformation wear, and interference wear. The experimental results demonstrated that the wear resistance of a thermoplastic gear with a tooth profile of 35° was 1.1 times higher than that of the gear with a tooth profile of 20°, which was consistent with the simulation analysis results and can be used as a theoretical basis for thermoplastic gear design in related fields.

Revision of a Monoblock Metal-on-Metal Cup Using a Dual Mobility Component: Is It a Reasonable Option?

Revision of large-diameter, monoblock acetabular components for both hip resurfacing arthroplasty and metal-on-metal (MoM) total hip arthroplasty (THA) is correlated to a high amount of complications. For this reason, performing a limited revision by conversion to a dual mobility (DM) without acetabular component exchange has been proposed in order to limit these complications. Although DM bearing offers an easy solution avoiding the intraoperative and time-associated complications, concern about polyethylene wear and stability remains due to the difference regarding the design, the coverage angle and the clearance of the two implants. In order to evaluate the performance of this new solution with the new material to prevent the possibility of failure it is essential to conduct a review of the literature A qualitative systematic review of the literature has been conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A comprehensive search of PubMed, EMBASE, Google Scholar, and Scopus for English and French articles between January 2000 and October 2019 was performed, with the primary objective of finding articles about dual mobility bearing coupling with large metal-on-metal cup in the case of hip revision procedure. Various combinations of the key words were used in the search strategy. Thirteen articles with DM bearing mated with MoM cup were analyzed. Of the 130 hip revisions selected, with a follow-up from 6 to 53 months, there were a total of 14 with complications (10.77%): four true dislocations (3.08%); six intra-prosthetic dislocations (IPD, 4.6%), two of which presented plastic deformation and polyethylene wear; four other complications (3.08%), included a cup osteolysis, a clicking noise, a superficial infection and a periprosthetic fracture. All the mentioned true dislocations occurred during the first month while IPDs appeared during the first two years from the index revision. In conclusion, according to the literature analyzed, we can stress that the concerns and doubts about mating a DM bearing with large MoM cup cannot be dissolved. It has been pointed out that a DM bearing is not designed for a MoM cup; it is not mechanically tested on MoM cups, which presents different clearance and coverage angles. Predictable complications may occur, such as IPD, polyethylene wear and true dislocation. These complications have been reported at an even higher rate than they were in the eighties, when the first generation of DM implants were of a lower quality of polyethylene and the characteristic of the design was less optimal than modern ones.

Dry Sliding Wear Behavior of Boron-Doped 205 Manganese Steels

In the present study, the wear properties of 205 manganese steels produced by a casting process with different boron contents (0.0023-0.0182 wt.%) were investigated, using a pin-on-disc tribometer under dry sliding conditions. The friction coefficient of 205 manganese steel by boron addition (at 0.0076 wt.%) reduced from 0.28 to 0.18. The addition of boron to 205 manganese steel led to a decrease in the friction coefficient due to the lubricating effect of boron. X-ray diffraction showed that the boron addition to 205 manganese steel increased lattice parameters of the samples. The wear test results at 5 and 10 N loads showed that the wear amount of 205 manganese steels decreased with boron addition. Thus, the wear results showed that the wear resistance of 205 manganese steel is increased with the addition of small amounts of boron. Furthermore, scanning electron microscopy images indicated that the characteristic wear mechanisms for the boron-doped samples on the worn surfaces were abrasive, and it was plastic deformation, mild abrasive, and adhesive wear mechanism in the undoped 205 manganese steel.

Studies on High Temperature Wear and Friction Behaviour of AA6061/B4C/hBN Hybrid Composites

This present work deals with the use of hexagonal boron nitride (h-BN) as a solid lubricant for AA6061/B4C composite due to its special features of self-lubricating property, thermal and chemical stability. The wear behaviour of composites at elevated temperature test, varied from 27 to 300 °C, was performed for AA6061 alloy with boron carbide (B4C) 5–15 wt% and h-BN 5–15 wt% reinforced hybrid composites under a load of 10 and 45 N at constant sliding velocity and sliding distance of 2.2 m/s and 2500 m. The prepared composites were characterized using X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis. The mechanical properties of hybrid composites were evaluated using tensile testing and hardness. The microstructural results revealed a homogenous distribution of reinforcement particles and grain refinement in the composites up to 10 wt% of h-BN. The tensile test results showed a significant improvement in the tensile strength up to 82% attained for the 15% B4C and 5% h-BN hybrid composite compared to AA6061 matrix alloy. The wear behaviour and different wear mechanisms under various testing conditions were explored. The mild-severe wear transition is noticed with increasing load and temperature for AA6061. The wear properties of a hybrid composite of C10N10 exhibited superior wear resistance due to the complete lubrication effect on the entire worn surface. The predominant wear of abrasive and adhesion occurred at room and elevated temperatures and low load conditions. Oxidative wear, plastic deformation, and delamination wear were operating with an increase in load and temperature.

Anisotropic Dry Sliding Friction and Wear Properties of a Novel Stainless Steel/ZA8 Alloy Interpenetrating Phase Composite Produced by Squeeze Casting

Novel interpenetrating phase composites (IPCs) were produced by infiltrating ZA8 alloy into sintered 304 stainless steel fiber preforms through squeeze casting. Microstructural characteristics and dry sliding wear behavior of the IPCs at room and elevated temperatures under different applied loads were investigated. The results indicate that the microstructures and wear behavior of the IPCs exhibit anisotropy. The IPCs have better wear resistance properties and lower friction coefficients in the longitudinal direction compared to the radial direction. Compared with the unreinforced alloy, the composites exhibit lower friction coefficients at both room and elevated temperatures, and the wear rate of the IPC is higher at room temperature and significantly lower at 120 °C. The friction coefficients and wear rates of the IPCs first decrease and then increase with increasing fiber fraction. The IPC with 35.98 vol% has the best wear resistance. For the IPCs, a higher applied load leads to a higher friction coefficient and wear rate. The predominant wear mechanisms for the ZA8 alloy are delamination wear, which becomes more severe with increasing applied load at room temperature, and plastic deformation and adhesive wear at 120 °C, and the IPCs show predominant abrasive (ploughing) wear and slight delamination wear. Abrasive wear becomes more severe for a too high fiber fraction at both temperatures.