Microstructure and friction and wear properties of titanium modified layer of preset TiCuZnSn by FSP
In order to obtain the biomedical titanium metal with good surface comprehensive properties,the equimolar Ti,Cu,Zn and Sn metal powders were preset on the surface of TA2 pure titanium,and the surface of pure titanium was modified by friction stir processing(FSP).The microstructure of the modified layer was observed and analyzed by scanning electron microscopy,energy dispersive spectro-meter and electron back scattering diffraction,and the mechanical properties of the modified layer were tested by nano-indentation and friction and wear tests.The results show that the TiCuZnSn modified layer with no internal defects and good combination with titanium matrix could be obtained by FSP,and the maximum depth of the modified layer is about 2.5 mm.Alloying elements Cu,Zn and Sn could im-prove the Young's modulus and hardness of the modified layer,especially the hardness of the modified layer.The TiCuZnSn modified layer has no significant effect on the friction coefficient of TA2 titanium,but the average wear rate of the modified layer is significantly reduced.Compared with TA2 titanium,the average wear rate of the surface modified layer is reduced by about 28.95%.
titaniumsurface modificationTiCuZnSn alloy layerfriction stir processingfriction and wear
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