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采用拉伸速率突变法,研究Ti-29Nb-13Ta-5Zr(Ti-29-13)合金冷轧后在700～800℃和5×10-4～1×10-2s-1应变速率范围内的高温变形行为和变形机制,并与典型β钛合金Ti-15V-3Cr-3Sn-3Al(Ti-15-3)进行比较。结果显示两种合金中均出现了非连续屈服现象,Ti-29-13合金的亚晶行为不同于Ti-15-3合金。Ti-29-13合金的延伸率低于Ti-15-3合金,应力指数n几乎恒定为3.3,变形激活能为152～161kJ/mol;Ti-15-3合金在730℃以上的n值为2.3～2.5,变形激活能为173～176kJ/mol。
The tensile rate mutation method was used to study the effect of Ti-29Nb-13Ta-5Zr (Ti-29-13) alloy at 700-800 ℃ and 5x10-4-1x10-2s-1 strain rate High temperature deformation behavior and deformation mechanism, and compared with the typical β titanium alloy Ti-15V-3Cr-3Sn-3Al (Ti-15-3). The results show that both alloys exhibit discontinuous yielding. The subgrain behavior of Ti-29-13 alloy is different from that of Ti-15-3 alloy. The elongation of Ti-29-13 alloy is lower than that of Ti-15-3 alloy, the stress index n is almost constant at 3.3 and the deformation activation energy is 152 ~ 161kJ / mol. The Ti value of Ti-15-3 alloy at 730 ℃ is 2.3 ~ 2.5, deformation activation energy of 173 ~ 176kJ / mol.