摘要
通过材料的热-力循环实验及数字图像相关(DIC)测量方法来系统研究Ni Ti记忆合金的热瞬态行为,得到不同恒应力水平下及不同温度变化率下的热瞬态响应。根据得到的实验结果,系统分析了温度诱发马氏体相变中的马氏体带演化出现的原因、演化规律以及临界相变应力与温度的关系,揭示了Ni Ti记忆合金的热瞬态相变及变形演化与所在的应力状态及温度变化速率的密切关系,为Ni Ti记忆合金的热瞬态过程的有限元多尺度模拟提供重要的参考。
The thermal transient behavior of NiTi memory alloy was studied by using the thermal-mechanical circulation experiment of material and digital image correlation （DIC） measurement system and the thermal transient behaviors were successfully got under different constant stress levels and temperature variation rates. Based on the experimental results, the reason and law of evolution for martensite deformation band, and the relation between critical phase transition stress and temperature during martensite transformation induced by temperature were systematically analyzed. It is revealed that the thermal transient phase transformation and deformation evolution of NiTi shape memory alloy have close relations with the stress state and temperature variation rate, which provides important information for multi scale finite element simulation during thermal transient process for NiTi shape memory alloy.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第7期120-126,共7页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51275270)
关键词
NITI形状记忆合金
热瞬态
相变
变形行为
NiTi shape memory alloy
thermal transient
phase transformation
deformation behavior
