Addition Of Cu Element Research Articles

Effect of Cu-doping on the microstructure and magnetic properties of low-cost MM-Fe-B melt spun ribbons

In this paper, MM-Fe-B ribbons with different MM contents were prepared by melt spun technique at a fixed copper roll speed of 25 m/s. The maximum magnetic energy product of the MM15Fe78B7 ribbon is 9.22 MGOe and the coercivity is 6005 Oe. With the increase of MM contents, the coercivity of the magnet was increased, and the highest coercivity reached 9352 Oe in MM18Fe75B7. In addition, the microstructure and magnetic properties of Cu-doped MM15Fe78-xB7Cux (x = 0, 0.4, 0.6, 1 at.%) ribbons were systematically investigated. The results show that the introduction of Cu can suppress the formation of α-Fe soft magnetic phase in the melt spun ribbons. When the Cu content is 0.4 at.%, the grain size decreased from 61 nm to 44 nm, and the coercivity was improved from 6005 Oe to 8527 Oe, which is an increment of about 42 %, whereas the remanence and the magnetic energy product can remain basically unchanged. The addition of Cu element can not only refine the grain size, but also facilitate the enhancement of the homogeneity of the microstructure of the ribbons.

Effect of Cu alloying on the damping and compression properties of graphene nanoplatelets reinforced Al-30Zn-xCu alloy matrix composites

For a long time, metal matrix composites (MMCs) have always faced a trade-off between damping and mechanical properties, and this is especially true for high-Zn Al alloy matrix composites. In this study, graphene nanoplatelets (GNPs) reinforced Al-30Zn-xCu-0.5GNPs laminated composites with excellent damping-mechanical property balance were fabricated by flake powder metallurgy and Cu alloying. The addition of Cu element greatly refines the intragranular and intergranular precipitated η-Zn phases, which not only increases the Al-Zn interfacial area but also weakens the tendency of cracking at the grain boundaries. The increased Al-Zn interfacial area is conducive to the improvement of the damping performance of the composites through the interfacial damping mechanism, but the excessive generation of θ-CuAl2 induced by too high Cu additions will harden the matrix, resulting in a simultaneous decrease in the damping performance and plasticity.

The role of Cu element in Fe9.4Co6.7Ni6.6Mn0.9V0.9Cu2.4 magnetic high-entropy alloys

Spark plasma sintering (SPS) technology has obvious advantages in the preparation of high entropy alloys (HEAs) with high mechanical properties, but the mechanism of their magnetic enhancement is not clear. In this work, HEAs with high saturation magnetization (Ms) and excellent mechanical properties were designed and prepared. The properties of Fe9.4Co6.7Ni6.6Mn0.9V0.9 HEA were optimized by adding Cu element, and the main phase of the HEAs was (face-centered cubic) FCC phase. The addition of Cu element mitigates the distortion of the FCC phase, resulting in an increase in the intensity of Ms value for the alloy from 118 emu/g to 143.7 emu/g. However, this also leads to a slight reduction in yield strength while still maintaining a high level at 1132 MPa. Theoretical calculations based on first principles indicate that the magnetic enhancement of these alloys is facilitated by an increase in the atomic magnetic moments of their ferromagnetic constituents.

Tailorable copper-bearing titanium alloys with remarkable strength and ductility fabricated by spark plasma sintering for biomedical applications

Titanium and Ti-based alloys are widely used metallic biomaterials, however, the surgical infections related to bacteria always occur on the implants. Developing the antibacterial titanium alloys has been studied as one of the most effective methods to lower the inflammatory response. The addition of Cu element to Ti matrix can produce strong antibacterial properties. Here, the antibacterial Ti-xCu alloys (x = 3, 5, and 7 wt%) were fabricated by powder metallurgy (PM) technique using spark plasma sintering (SPS) route. The effects of Cu addition, SPS temperature, and post-heat treatment on microstructure and tensile properties of Ti–Cu alloys were investigated. The strengthening and deformation mechanisms were also discussed. The microstructures of PM Ti–Cu alloy consisting of α-Ti and Ti2Cu phases are fine and homogenous as well as free of porosity. With the increasing Cu addition, the yield and tensile strengths of Ti–Cu alloys increase, but the elongation decreases. The precipitation of Ti2Cu phases contributes the most increments of yield strength, and can also act as the barriers to pile up the dislocations during the plastic deformation, improving the work hardening rate and tensile strength. PM Ti–Cu alloys possess a good tensile strength of 575–810 MPa, and an excellent elongation of 11%–29%. The optimized tensile properties of PM Ti–5Cu alloys are comparable and even superior to those of Ti and other Ti-based alloys produced by traditional methods. Further, insights for the design and processing of PM Ti–Cu alloys with ample shaping freedom fabricated by SPS method are generalized and discussed.

Effect of Cu content on microstructure and properties of Ti-6Al-4V alloy fabricated by double-wire arc additive manufacturing

To solve the formation of coarse columnar β grains from Ti-6Al-4 V parts fabricated by wire + arc additive manufacturing, this study adds Cu element for in-situ alloying, effectively suppressing the growth of columnar grains and further enhancing properties. The results show that an addition of Cu element suppresses the lateral growth of β grains, eliminating the columnar structure of β grains. Compared with the Ti-6Al-4 V component, the original β grains in the Ti-6Al-4 V-10Cu component exhibit a refinement of 96 %. With an increase of Cu content, the phase structure of α-Ti transitions from lamellar to needle-like and eventually to equiaxed crystal structure. Moreover, as the Cu content rises, the precipitation of Ti2Cu increases, leading to precipitation strengthening and enhancing the microhardness. The average strength of the Ti-6Al-4 V-10Cu, Ti-6Al-4 V-11.7Cu, and Ti-6Al-4 V-15.7Cu walls is increased by 35.5 %, 56.9 %, and 71.6 %, respectively, compared with the Ti-6Al-4 V wall. The ultimate tensile strength is enhanced by 34.9 %, 49.5 %, and −1.4 %, respectively. However, the elongation is reduced by 48.6 %, 63.2 %, and 75.6 %, respectively.

Effect of Cu addition on the thermal conductivity and mechanical properties of Mg–Zn-xCu-Ce alloys

Thermal conductivity and mechanical properties of Mg–Zn-xCu-Ce alloys with different Cu contents under low extrusion temperature were systematically investigated in this work. The results shows that MgZnCu and Ce-rich (Mg, Zn, Cu, Ce) phase were formed in Mg–Zn-xCu-Ce alloys with high Cu content, which have significantly effect on the thermal conductivity and dynamic recrystallization (DRX). The distribution of grain morphology and LAGBs indicates that CDRX is the main mechanism. The addition of Cu element has an inhibitory effect on the DRX behavior, greatly refining the DRXed grains. After extrusion, a large amount of nano-phase is dispersed in the MZEC alloy, which has a strong pinning effect on dislocations. The formation of MgZnCu phase with high thermal conductivity sacrifices the solute atoms of Zn and Cu in α-Mg matrix, which leads to reduction of lattice distortion of Mg matrix, thereby ensuring high thermal conductivity of Mg–Zn–Cu–Ce ternary magnesium alloys. With the increase of Cu content, the strength and thermal conductivity of the alloy gradually increases. When the Cu content is 3.6 wt%, UTS (ultimate tensile strength), YS (yield strength), EL (elongation) and thermal conductivity are 350 MPa, 317 MPa,15.8% and 135 W/m∙K, respectively.

Effect of 0.5 at. % Cu addition on the crystallization behavior and soft magnetic properties of Fe83B11C1Si2P3 alloy

In order to gain insight into how the addition of Cu element affects the crystallization mechanism of amorphous nanocrystalline alloys and soft magnetic properties, the crystallization behavior of (Fe0.83B0.11Si0.02P0.03C0.01)100-xCux (x = 0 and 0.5) amorphous ribbons was investigated based on kinetic and thermodynamic behavior under non-isothermal and isothermal annealing conditions. The results show that under non-isothermal annealing conditions, the Cu0.5 amorphous ribbon not only favors the formation of the amorphous structure, but also enlarges the temperature window for annealing and improves the thermal stability of the α-Fe(Si) phase. At the same time, the Cu0.5 amorphous ribbon shows slow kinetic and is insensitive to heating rate change during annealing treatment. Under isothermal conditions, the addition of Cu decreases the nucleation activation energy (En) and increases the growth activation energy (Eg). This further indicates that the nucleation of α-Fe(Si) grains is easier than the growth process, which is conducive to the formation of a homogeneous nanostructure and improves the soft magnetic properties of the alloy. Compared to Cu0 amorphous ribbon, it is also shown that the Cu0.5 amorphous ribbon changes the crystallization mechanism from diffusion-controlled one-dimensional to two-dimensional growth when the crystallization volume fraction x is 10–30 vol%. While three-dimensional growth become dominated when x is reaches 60 vol% for both ribbons. Therefore, the kinetics of crystallization as well as microstructure supports that the Cu0.5 ribbon is able to exhibit uniformly fine nanocrystalline structures. Further, the Cu0.5 nanocrystalline ribbon shows a higher Bs of 1.85 T and a lower Hc of 2.55 A/m, respectively, and the favorable (100) orientation of α-Fe(Si) grains formed after annealing is another factor to increase Bs.

Outstanding performance of FeNiCoCr-based high entropy alloys: the role of grain orientation and microsegregation

High entropy alloys have presented more interests in energy related applications including catalyst materials. However, the engineering application of these materials is still hindered by lacking information of their mechanical and electrochemical behaviors. Different high-entropy alloys based on FeNiCoCr system (FeNiCoCr, FeNiCoCrCu, and FeNiCoCrMn) were fabricated based on thermodynamic predictions and studied in terms of microstructure and grain orientation in relationship with their mechanical and catalytic properties. The single-phase FCC solid-solutions were obtained in all the fabricated alloys, which have shown excellent ductility during compressive testing. The coarse dendrictic microstructure was observed in FeNiCoCr and FeNiCoCrMn alloys, while the finer one was obtained in FeNiCoCrCu, which presented higher value of microhardness. Analyses of EBSD measurements in the studied alloys have shown a strong relationship between the grain orientations and their mechanical behavior. Furthermore, a good corrosion resistance was achieved for the three fabricated alloys, being better the alloy with the addition of Cu element. Among the studied alloys, FeNiCoCrCu has presented excellent electrocatalytic activity and stability toward hydrogen evolution reaction in acidic media. The enhancement in corrosion resistance of FeNiCoCrCu could be associated with presence of {111}//ND component, while its strong catalytic activity is related to the {220}//ND orientation dominated by the material. This outstanding performance of FeNiCoCrCu has demonstrated as a promising candidate to substitute Pt for application as electrocatalyst in acidic media.

Characterization on corrosion and antibacterial properties of a new functionally graded porous Ti–Mo–Cu alloys with improved cytocompatibility

Biomaterial-associated infection for Ti–Mo alloy needs to be solved imminently, a functionally-graded porous Ti–15Mo-xCu alloys (x = 3, 7, 11, and 15 wt %) were developed by powder metallurgy. The effects of the Cu content on corrosion resistance, antibacterial properties, and cytocompatibility of the Ti–15Mo-xCu alloys were investigated. The results show the Ti–15Mo-xCu alloys were composed of β-Ti, α-Ti, and Ti2Cu phases. With the addition of Cu element, the Ti2Cu phase of the Ti–15Mo-xCu alloys mainly distributed at the grain boundaries, generating a micro-galvanic cell effect, which led to a decrease in the corrosion resistance of the Ti–15Mo-xCu alloys, compared with the Ti–15Mo alloy. Stable passivation was induced by the oxide films consisting of TiO2, MoO3, and Cu2O on the surface of the alloy during the corrosion process. The antibacterial properties increased with increasing Cu content. The antibacterial rate of the Ti–15Mo-xCu alloy with 7–15 wt % Cu content was greater than 90% against Escherichia coli, revealing good antibacterial properties. Moreover, the biocompatibility of the Ti–Mo–Cu alloy exhibited a downward trend after the culturing when the Cu content ranged from 11 to 15 wt %. Overall, the Ti–15Mo–7Cu alloy exhibited good corrosion resistance, antibacterial properties, and cytocompatibility, revealing its great potential in clinical applications.

Structural heterogeneity, β relaxation and magnetic properties of Fe-Zr-B amorphous alloys with Si and Cu additions

Despite numerous studies on β relaxation of amorphous alloys, the relationship between structural heterogeneity and β relaxation and the effect on magnetic properties of Fe-based amorphous alloys is still unknow. In this work, the structure and magnetic properties of Fe84-xZr6B10Mx (M = Si, Cu; x = 0, 0.6, 1 at%) amorphous alloys were investigated. With the increase of Si content, the negative value of average chemical affinity (∆Hchem) of the alloys is increased, leading to the synergetic enhancement in structural heterogeneity and β relaxation. In addition to this, the increase of liquid-like regions (LLRs) reduces saturation magnetic flux density (Bs) and increases coercivity (Hc). However, the addition of Cu element decreases the negative value of ∆Hchem of the alloys, resulting in weakening of structural heterogeneity and β relaxation synergetically. The reduction of LLRs has resulted in increase in Bs. Moreover, Fe-Cu atom pairs with positive enthalpy of mixing increases the local density of quasi dislocation dipoles (QDDs), resulting in the increase of Hc.

Efficient oily wastewater treatment by a novel electroflotation-membrane separation system consisting a Ni-Cu-P membrane prepared by electroless nickel plating

Electroflotation-membrane separation system with a conductive membrane has recently emerged as a promising technology for oily wastewater treatment. However, the conductive membrane prepared by electroless plating often suffers the problems of low stability and high activation cost. To solve these problems, this work proposed a new strategy regarding surface metallization of polymeric membrane by surface nickel-catalyzed electroless nickel plating of nickel‑copper‑phosphorus alloys for the first time. It was found that, addition of copper source remarkably enhanced the membranes' hydrophilicity, corrosion resistance and fouling resistance. The Ni-Cu-P membrane had an underwater oil contact angle of up to 140°, and simultaneously possessed rejection rate > 98 % with rather high flux of 65,663.0 L·m−2·h−1 and excellent cycling stability when separating n-hexane/water mixtures under gravity drive. The permeability is higher than the state-of-the-art membranes for oil/water separation. The Ni-Cu-P membrane as the cathode can be assembled into an electroflotation-membrane separation system, allowing to separate oil-in-water emulsion with 99 % rejection. Meanwhile, the applied electric field significantly improved membrane flux and fouling resistance (flux recovery up to 91 %) when separate kaolin suspensions. Polarization curve and Nyquist curve analysis further confirmed that addition of Cu element obviously enhanced corrosion resistance of the Ni modified membrane. This work provided a novel strategy to make up high-efficiency membranes for oily wastewater treatment.

Effects of Cu/Er on Tensile Properties of Cast Al-Si Alloy at Low Temperature.

The current protocol presents the effects of the addition of Cu, rare earth Er, and Cu-Er composite elements on the microstructure of the Al-10Si-0.3Mg alloy. The variations in their low-temperature tensile properties were also investigated. The addition of rare earth Er elements, Cu elements, and Cu-Er composite elements increased the strength of all three groups of alloys when stretched at low temperatures (-60 °C). Further, the elongation of the alloy increased with the addition of Er, while the elongation of the other two groups decreased. The low-temperature (-60 °C) tensile strength of the alloy with the same composition was higher than that at room temperature (20 °C), but the elongation decreased. Notably, by adding rare earth Er to the Al-10Si-0.3Mg alloy, the three-dimensional morphology was changed from coarse dendritic to fine fibrous, the secondary dendritic arm spacing (SDAS) of the alloy was reduced, and the grains were refined. The Al2Cu phase, Al-Si-Cu-Mg quaternary phase, and Cu-rich phase appeared in the alloy with the addition of Cu elements, but the Si phase morphology and α-Al dendrites were not significantly improved. Interestingly, the Si phase morphology of the alloy was improved by adding Cu-Er composite elements, and SDAS was reduced. Still, the Al2Cu phase, Al-Si-Cu-Mg quaternary phase, and Cu-rich phase were not much improved.

Effects of Antibacterial Co-Cr-Mo-Cu Alloys on Osteoblast Proliferation, Differentiation, and the Inhibition of Apoptosis.

ObjectivesTo investigate the effects of antibacterial Co‐Cr‐Mo‐Cu alloys with different Cu contents on osteoblast proliferation, differentiation, and the inhibition of apoptosis to optimize the selection of surgical implantation.MethodsMicrostructure, phase structure, and ion release were evaluated using X‐ray diffraction, scanning electron microscopy (SEM), and inductively coupled plasma (ICP) spectrometry. The effects on osteoblast proliferation, differentiation, and apoptosis were characterized by cell proliferation assay, alkaline phosphatase (ALP) activity assay, and western blotting, respectively.ResultsCompared to the original Co‐Cr‐Mo alloys, the released Cu ions from Co‐Cu alloys promoted osteoblast proliferation and differentiation and inhibited apoptosis. It can be noted that the optical density (OD490) and the ALP activity have increased to 1.237 and 1.053, respectively, in Co‐2Cu alloy (0.604 and 0.171 for original Co‐Cr‐Mo alloy). Meanwhile, these effects were evaluated through the upregulation of ROS levels and 4E‐binding protein 1 (4E‐BP1) expression and the downregulation of adenosine 5′‐monophosphate (AMP)‐activated protein kinase (AMPK) and p‐AMPK. Moreover, the antibacterial properties of the Co‐Cu alloys were also enhanced, as demonstrated by the strong antibacterial activity of Cu phases in Co‐Cu alloys incubated with Staphylococcus aureus, in which more than 99.8% of the bacteria has been killed.ConclusionsThe addition of Cu element in the Co‐Cr‐Mo alloys could induce OB proliferation and differentiation and inhibited OB apoptosis. Meanwhile, it can be recognized that the Co‐Cu alloys with 2wt% Cu exhibit the highest performance among all the samples, indicating that the effects of osteoblast differentiation and the inhibition of apoptosis are highly dependent on the adding of Cu elements. Co‐Cr‐Mo‐Cu alloys with an excellent antibacterial property could be used as a tool to improve osteogenic ability and antibacterial properties in orthopaedic implant operations.

Efficient rejuvenation of heterogeneous {[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4}99.9Cu0.1 bulk metallic glass upon cryogenic cycling treatment

The effects of cryogenic thermal cycling on deformation behaviour and structural variation of {[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4}99.9Cu0.1 bulk metallic glass (BMG) were studied and compared with Cu-free [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG. After thermal-cycled treatment between 393 K and cryogenic temperature, the {[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4}99.9Cu0.1 BMG obtained a plastic strain of 7.4% combined with a high yield strength of 4350 MPa. The excellent soft magnetic properties were maintained after CTC treatment. The minor addition of Cu element results in an initial nano-sized heterogeneity in the matrix, which facilitates the rejuvenation process during thermal cycling, and brings to a low optimal thermal temperature of 393 K, making the {[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4}99.9Cu0.1 BMG more attractive in industrial application. During thermal cycling, the formation of more soft regions leads to the increase of structural heterogeneities, which is beneficial to the initiation of shear transition zones and the formation of multiple shear bands, and thus results in the enhancement of plasticity. This study links the subtle variation of specific structure with macroscopic mechanical properties, and provides a new insight of composition selection for cryogenic thermal cycling treatment.

Microstructure and mechanical properties of Sn–58Bi eutectic alloy with Cu/P addition

Sn–(58-x) Bi–x Cu/P ternary alloys were prepared by downward continuous casting, and the microstructure of the alloy was characterized using scanning electron microscopy (SEM), x-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The results show that the addition of Cu and P can refine the eutectic structure and form rod-shaped Cu6Sn5 and P3Sn4 phases distributed in Sn matrix. The refined eutectic structure can be observed in Sn–(58-x) Bi–x Cu/P alloys, and this results in the elongation at break increases up. In addition, the wettability of Sn–58Bi alloy increases on Cu substrate with the addition of Cu and P elements. The improvement of the wettability of Sn–58Bi alloy by the addition of Cu element can be attributed to the increase of Cu-Sn IMC nucleation and growth rate. The addition of P element in Sn–58Bi alloy can improve its anti-oxidation performance, which is beneficial to the improvement of its wettability.

Effect of Copper Addition on Fatigue Strength Al-10Si Alloys Produced by Die Casting

Aluminum Silicon Alloy (Al-Si) is widely used in the industry because it has a good cast ability, good mechanical properties and good corrosion resistance. At its expense, many failures are caused by fatigue fracture. Fatigue fracture is caused by a dynamic load within a certain time or cycle. Nearly 90% of structural components damaged caused by fatigue fracture. To improve the mechanical properties of Al-Si alloys can be added Cu elements. In this study Al-10Si alloys added Cu elements with variations of 1, 3, 5 (wt.%) Through die casting process. The casting results are mechanical characterized by hardness test, tensile test and fatigue test. The microstructure was examined by optical microscope and SEM. The results showed that the addition of Cu elements up to 5 wt. % in Al-10Si increased hardness to 98 HRB and tensile strength to 245.23 MPa but decreased ductility from 3.1% to 2.4%. The results of fatigue test showed a significant increase in the number of cycles at 80MPa can reach 1.5 x 107 without fracture (fatigue endurance limit). The microstructure examination results confirmed the presence of CuAl2. The CuAl2 phase inhibits dislocation movement so that greater force for deformation and improve mechanical properties

Improved corrosive wear resistance of carbidic austempered ductile iron by addition of Cu

In this work, different contents of Cu were added into carbidic austempered ductile iron (CADI) to improve the corrosion resistance and the corrosive wear resistance. Microstructures of CADI have been systematically investigated by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), atomic force microscope (AFM). The results showed that with the addition of Cu elements, the thickness of bainitic ferrite plates and the potential difference (ΔUmatix- graphite nodules and ΔUmatix- carbides) were reduced significantly. The effect of Cu on the corrosion resistance and the corrosive wear resistance has been studied by an electrochemical workstation and two kinds of corrosive wear tester. In addition, worn surfaces and corroded surfaces of the samples have been examined by SEM, 3D laser scanning microscope and X-ray photoelectron spectroscopy (XPS). As the Cu content increased, the corrosion resistance of CADI under acidic condition increased. When the Cu content was 1 wt%, both corrosive wear resistance without load under alkaline condition and corrosive wear resistance with load under alkaline and acidic condition were optimal. Nevertheless, under acidic condition, the corrosive wear resistance without load of CADI with 1.5 wt% Cu was optimal.

The Effect of Cu and Mo on Mechanical Properties and Corrosion Resistance of Austempered Ductile Iron

The metal casting is the most economical manufacturing process. It can make products with complex geometries in one process. Austempered Ductile Iron (ADI) is a cast iron product that has high prospects for application, because ADI has a high strength closed to forged iron. The purpose of this study is to investigate the effect of addition of Cu and Mo on mechanical properties and corrosion resistance of ADI. Cu is added with percentages of 0.5 and 1% by weight, while Mo is added by percentages of 0.3 and 0.6% by weight. The austempering process is conducted on salt bath temperture 350 <sup>o</sup>C for 4 hours. The results of the process were characterized by hardness test, tensile test and corrosion resistance. Hardness and tensile strength of ADI were tested by Brinell hardness test based on ASTM E10 and ASTM E8 repectively. Corrosion resistance of ADI was tested by immersion corrosion testing based on ASTM G31 standard. The results of this study indicate that the addition of Cu element significantly increases the strength of ADI. The addition of Mo element inhibits graphite nodularity and not significantly increases the mechanical properties. Addition of Mo increases corrosion resistance due the amount of retained austenite.

Fabrication of biodegradable MgXCu(X=0, 0.1, 0.4, 0.7) coating on Ti6Al4V alloy with enhanced antibacterial property

ABSTRACT Currently, orthopaedic implant materials such as titanium alloy are biologically inert materials which are not easily integrated with bone tissues, thus resulting in implantation failures due to the loosening and infection. In this study, bioactive MgXCu(X = 0, 0.1, 0.4, 0.7) coatings were successfully fabricated on Ti6Al4 V substrate by arc ion plating (AIP) technique to improve the antibacterial property. The surface composition and morphology of the coating was characterised by X-ray diffraction, inductively coupled plasma-atomic emission spectrometry (ICP) and scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). The electrochemical experiment and immersion test showed the corrosion rate of MgXCu coating increased with the addition of Cu element. Antibacterial assays proved that the MgXCu coating could successfully reduce the viability of Staphylococcus aureus (S.aureus) and the thickness of the bacterial film. Consequently, it is concluded that MgXCu coated Ti6Al4 V with antibacterial property is much potential to be used in orthopaedic applications.

Study on microstructure and mechanical properties of as-cast Mg-Zn-Sn-xCu(x=0,0.5,1.0,1.5wt.%) alloys

In this paper, with the help of optical microscope, X-ray diffraction, scanning electron microscope and mechanical testing machine, the microstructures of ZT63-xCu (x=0,0.5,1.0,1.5wt.%) magnesium alloys were investigated and their mechanical properties were explored. It was found that the structure of as-cast alloys presented a typical dendrite morphology. The eutectic structure was refined by the addition of a certain amount of Cu, When Cu content continued to increase, the volume fraction of the eutectic structure increased and its continuity enhanced. The alloy without Cu addition was composed of α -Mg, MgZn2 and Mg2Sn phases. With the addition of Cu elements, MgZnCu phase was formed in the alloy, in addition to α-Mg, MgZn2 and Mg2Sn phases. With the increase of Cu content, the volume fraction of MgZnCu phase increased, and the proportion of MgZn2 phase gradually decreased. ZT63 alloy had the best matching of mechanical properties, its tensile strength and yield strength were 231Mpa and 80Mpa respectively, and the elongation reached 14.5%. With the increase of Cu, the mechanical properties of the alloys declined. When the Cu content is 1.5wt.%, tensile strength of the alloy decreased to 174Mpa, and the elongation was only 7%. The reduction of mechanical properties was related to the increase of MgZnCu phase.