【摘要】 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。更多还原

【Abstract】 Incremental step strain-rate test in the temperature range of 700-800 oC and the strain rate range of 5×10-4-1×10-2 s-1 were conducted for investigation of high temperature deformation behavior of Ti-29Nb-13Ta-5Zr(Ti-29-13),as well as another typical β titanium alloy Ti-15V-3Cr-3Sn-3Al(Ti-15-3).Results show there exist discontinuous yielding phenomenon in both alloys and the subgrain behavior is different between them.The strain to failure of Ti-29-13 is lower than that of Ti-15-3.In the deformation of Ti-29-13,the stress exponent is near 3.3,which is almost constant,and the deformation activation energy is 152-161 kJ/mol;while in the deformation of Ti-15-3,the stress exponent at the temperatures higher than 730 oC is 2.3-2.5,and the deformation activation energy is 173-176 kJ/mol.更多还原