Hot deformation behavior of Cu-bearing antibacterial titanium alloy  

作　　者：Zheng Ma Ling Ren M.Babar Shahzad Rui Liu Ying Zhao Ke Yang 

机构地区：[1]Institute of Metal Research, Chinese Academy of Sciences [2]Center for Human Tissues and Organs Degeneration, Shenzhen Institute of Advanced Technology, Chinese Academy of Science

出　　处：《Journal of Materials Science & Technology》2018年第10期1867-1875,共9页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51631009,81271957,51501218,and 81572113);the Guangdong Provincial Science and Technology Projects(No.2014A010105033);the Shenzhen Peacock Programs(Nos.KQCX20140521115045444 and 110811003586331);the Shenzhen-Hong Kong Technology Cooperation Funding Scheme(No.SGLH20150213143207919);the Basic Research Project of Shenzhen City(No.JCYJ20120616142847342);Shenzhen Science and Technology Research Funding(JCYJ20160608153641020)

摘　　要：We investigated the deformation behavior of a new biomedical Cu-bearing titanium alloy （Ti-645 （Ti-6.06AI-3.75V-4.85Cu, in wt%）） to optimize its microstructure control and the hot-working process. The results showed that true stress-true strain curve ofti-645 alloy was susceptible to both deformation tem-perature and strain rate. The microstructure of Ti-645 alloy was significantly changed from equiaxed grain to acicular one with the deformation temperature while a notable decrease in grain size was recorded as well. Dynamic recovery （DRV） and dynamic recrystallization （DRX） obviously existed during the thermal compression of Ti-645 alloy. The apparent activation energies in （α ＋ β） phase and β single phase regions were calculated to be 495.21 kJ mo1^-1 and 195.69 kJ mo1^-1, respectively. The processing map showed that the alloy had a large hot-working region whereas the optimum window occurred in the strain rate range of 0.001-0.1 s-1, and temperature range of 900-960℃ and 1000-1050℃. The obtained results could provide a technological basis for the design of hot working procedure of Ti-645 alloy to optimize the material design and widen the ootential application of Ti-645 alloy in clinic.We investigated the deformation behavior of a new biomedical Cu-bearing titanium alloy （Ti-645 （Ti-6.06AI-3.75V-4.85Cu, in wt%）） to optimize its microstructure control and the hot-working process. The results showed that true stress-true strain curve ofti-645 alloy was susceptible to both deformation tem-perature and strain rate. The microstructure of Ti-645 alloy was significantly changed from equiaxed grain to acicular one with the deformation temperature while a notable decrease in grain size was recorded as well. Dynamic recovery （DRV） and dynamic recrystallization （DRX） obviously existed during the thermal compression of Ti-645 alloy. The apparent activation energies in （α ＋ β） phase and β single phase regions were calculated to be 495.21 kJ mo1^-1 and 195.69 kJ mo1^-1, respectively. The processing map showed that the alloy had a large hot-working region whereas the optimum window occurred in the strain rate range of 0.001-0.1 s-1, and temperature range of 900-960℃ and 1000-1050℃. The obtained results could provide a technological basis for the design of hot working procedure of Ti-645 alloy to optimize the material design and widen the ootential application of Ti-645 alloy in clinic.

关 键 词：cu-bearing titanium alloy Constitutive equation Thermal deformation MICROSTRUCTURE Processing map 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TS207.3[金属学及工艺—金属材料]