热锻TiNi形状记忆合金膨胀分析  

Investigation of Hot Forged TiNi Shape Memory Alloy by Dilatometry

作　　者：钱士强[1] 吴建生[2] 

机构地区：[1]上海工程技术大学材料学院,上海200336 [2]上海交通大学材料学院,上海200031

出　　处：《热加工工艺》2004年第12期54-56,共3页Hot Working Technology

基　　金：高等学校博士学科点专项基金资助项目(20020248037);上海市科技发展基金资助项目(02DJ14042)

摘　　要：用膨胀法研究了热锻变形非平衡状态TiNi合金的相变特征,结果表明:热锻变形态TiNi合金有两类截然不同的膨胀曲线,第 类在降温时膨胀,对应B2→M相变;第 类在降温时收缩,对应B2→R相变。热锻变形更有利于R相变发生。热锻变形态合金的相变温度较高,在0℃乃至室温以上。其发生相变时的线伸长变化量比较大。固溶处理后,合金的相变温度降低,线伸长变化量减小。The phase transition characteristic of non-equilibrium TiNi alloy deformed by hot forge was studied with dilatometry. It is found that there are two kinds of completely different expansion curve when the alloy samples heating and cooling;if temperature drops samples I expanded but samples II contracts,the former is corresponding to B2→M phase change and the latter is B2→R;hot forging is promote to R not to M phase changing;the alloy deformed by hot forge has higher transformation temperature, above 0℃ or RT and has longer linear expansion elongation when phase change. Undergo solution treatment the transformation temperature of the alloy lower and linear expansion elongation reduce.

关 键 词：TINI合金 热变形 膨胀分析 R相变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]