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.
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)
