Ti6Al4V合金的低温超塑性拉伸变形行为

材料研究学报

2008, Vol. 22

Issue (3): 269-273

论文

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Ti6Al4V合金的低温超塑性拉伸变形行为

赵文娟;丁桦;曹富荣;赵敬伟;张亚玲

东北大学材料与冶金学院

Mechanical Behavious of Ti6Al4V Alloy during Low-temperature Superplastic Deformation

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东北大学材冶学院

引用本文:

赵文娟; 丁桦; 曹富荣; 赵敬伟; 张亚玲 . Ti6Al4V合金的低温超塑性拉伸变形行为[J]. 材料研究学报, 2008, 22(3): 269-273.

全文: PDF(964 KB)

摘要: 在700℃-850℃的温度范围内对Ti-6%Al-4%V(质量分数)合金板材进行超塑性拉伸试验,研究了应变速率为3×10-4 -5×10-3s-1条件下的拉伸变形行为. 结果表明:Ti6Al4V合金在空气中表现出良好的低温超塑性变形能力. 在800℃初始应变速率ε=5×10-4s-1条件下,延伸率达到536%. 在较低的700℃下变形(ε=5×10-4s-1), 延伸率仍然超过了300%. 在整个变形温度区间内,应变速率敏感性指数m均为0.3左右, 最大值为0.63.在850℃变形激活能与晶界自扩散激活能十分相近,表明晶界扩散控制的晶界滑动是超塑性变形的主要机制.在700-750℃, 变形激活能远大于晶界自扩散激活能, 位错运动是激活能升高的原因.在800℃变形的激活能介于两者之间, 表明随着温度的降低变形机制逐渐发生改变.

关键词 ：金属材料, Ti6Al4V合金, 低温超塑性

Abstract：In this study, superplastic tensile tests were carried out for Ti-6wt%Al-4wt%V alloy at temperatures of 700℃～850℃with initial strain rates of 3×10-4～5×10-3s-1. The tensile results show that Ti6Al4V alloy exhibit good low temperature superplasticity. The elongation of 536% was obtained at 800℃ with an initial strain rate of 5×10-4s-1, and the elongation over 300% were obtained even at a temperature of 700℃ (with an initial strain rate of 5×10-4s-1). The strain rate sensitivity values m kept about 0.3 in the whole deformation temperature range, and the maximal m value was 0.55. At the temperature range of 800～850℃, the deformation activation energy was very close to self-diffusion activation energy of grain boundary, which shows the main deformation mechanism is grain boundary sliding controlled by grain boundary diffusion. Yet, at the temperature range of 700～750℃, the deformation activation energy was much higher than the self-diffusion activation energy of grain boundary. The reason may be dynamic recrystallization and active dislocations motion.

Key words： Ti6Al4V alloy low-temperature superplasticity activation energy

收稿日期: 2007-08-17

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https://www.cjmr.org/CN/Y2008/V22/I3/269

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