Effect of Cu on Martensite Transformation of CoCrMo alloy for biomedical application

作     者：Ruoxian Wang Gaowu Qin Erlin Zhang Ruoxian Wang;Gaowu Qin;Erlin Zhang

作者机构：School of Materials Science and EngineeringKey Lab.for Anisotropy and Texture of MaterialsEducation Ministry of ChinaNortheastern UniversityShenyang110819China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第52卷第17期

页      面：127-135页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financial support from National Natural Science Foundation(No.31271024 and No.31470930) 

主　　题：Biomaterials Co-based alloy Cu addition Precipitation Martensite transformation 

摘      要：The martensite transformation of Co-29Cr-6Mo-xCu(Co-xCu,x=0,1.5,2,4,wt%)alloys was investigated in order to explore ductile Co-based alloy without Ni for biomedical *** effect of Cu on martensite transformation of Co-29 Cr-6 Mo alloy was investigated using scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-Ray diffraction(XRD)and electron backscatter diffraction(EBSD)*** results revealed that the fraction ofγ-phase was increasing with increasing of copper *** detail,the fraction ofγ-phase of aged Co-1.5 Cu alloy was 4.72%and noγ-phase was found in aged Co-0Cu ***,the fraction ofγ-phase of aged Co-2Cu alloy and Co-4Cu alloy was 51.68%and 46.17%,*** demonstrated that the minimum Cu content which could inhibit martensite transformation in this alloy system was 2 wt%.Calculated phase diagram revealed that increasing the copper content of this alloy system could enlargeγ-phase zone,which means Cu could inhibit the formation ofγ-phase and consequently stabilizeγ-*** distributed Cu-rich phase was identified in aged Co-4Cu *** possible reason for the inhibition of martensite transformation by Cu addition is that alloying with Cu atom might decrease charge accumulations and increase atomic bonds,which increase the stacking fault energy ultimately.