Ti-Ni-V形状记忆合金超弹性研究  

Superelasticity of Ti-Ni-V Shape Memory Alloys

作　　者：贺志荣[1] 

机构地区：[1]陕西理工学院,陕西汉中723003

出　　处：《稀有金属材料与工程》2015年第7期1639-1642,共4页Rare Metal Materials and Engineering

基　　金：陕西省科技统筹创新计划(2011KTDZ01-03-06);陕西省教育厅科技计划(12JK0436)

摘　　要：采用拉伸和应力-应变循环实验研究了退火温度、时效温度、时效时间、形变温度和应力-应变循环对Ti-50.8Ni-0.5V（原子分数,%）形状记忆合金超弹性（SE）的影响。随退火温度的升高,合金的应力诱发马氏体临界应力（σM）先减小后增大,超弹性残留应变（εR）先增大后减小再增大,为了获得优异的室温SE,退火温度应取500～600℃。随时效温度的升高,合金的σM降低,εR增加,SE变差;随时效时间延长,300℃时效态合金的SE稳定,400和500℃时效态合金的SE变差。随形变温度的升高,σM增加,SE改善。随循环次数增加,400℃退火态合金的SE稳定;500℃退火态合金的σM降低;600℃退火态合金的SE由非线性向线性转变。The effects of annealing temperature, annealing time, aging temperature, aging time, deformation temperature and stress-strain cycle on superelasticity（SE） of Ti-50.8Ni-0.5V（atomic fraction, %） shape memory alloys were investigated by tensile tests and stress-strain cycle tests.With increasing the annealing temperature, the critical stress for inducing martensitic transformation（σM） of the alloy decreases first and then increases; the residual strain（εR） first increases, then decreases, and finally increases.To get an excellent SE at room temperature for the alloy, the annealing temperature should be 500～600 ℃.With increasing aging temperature, the σM decreases, the εR increases, and the SE of the alloy becomes weak.With increasing aging time, the SE of 300 ℃ aged alloy are stable, while the SE of 400 and 500 ℃ aged alloys deteriorates.With increasing deformation temperature, the σM increases, while the SE improves.With increasing cyclic number, the SE of the 400 ℃ annealed alloy is stable, the σM of the 500 ℃ annealed alloys drops, and the SE of 600 ℃ changes from nonlinear type to linear type.

关 键 词：Ti-Ni-V合金 形状记忆合金 超弹性 热处理 循环形变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]