锻压技术

NiTi形状记忆合金的热瞬态相变与变形行为研究

英文标题：Thermal transient phase transformation and deformation behavior of NiTi shape memory alloy

作者：杜泓飞萧遥曾攀雷丽萍黑梦

单位：清华大学

分类号：

出版年,卷(期):页码：2015,40(7):120-126

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NiTi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NiTi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NiTi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.

基金项目：

国家自然科学基金资助项目(51275270)

杜泓飞（1986-），男，博士研究生

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