约束加热温度对近等原子比NiTi合金相变行为的影响  

Effect of Constrained-heating Temperature on the Transformation Behavior ina Near-equiatomic NiTi Alloy

作　　者：刘礼华 杨建华[2] 赵连城[2] 

机构地区：[1]江苏江阴钢绳厂金属制品研究所 [2]哈尔滨工业大学

出　　处：《金属科学与工艺》1992年第2期24-29,共6页

摘　　要：本文用电阻法、X 射线衍射和透射电镜技术研究了约束加热温度对近等原子比 NiTi 合金相变行为的影响。结果表明,合金的相变行为随约束加热温度的不同而有显著差异。未经约束加热的试样中仅发生马氏体相变,经100℃和450℃约束加热后,在发生马氏体相变前分别发生无公度相变和 R 相变,而经550℃约束加热后,则仅发生马氏体相变。文中分析了上述相变行为的内在原因,并指出与不同约束加热温度下所发生的内应力场有关。The effect of constraied-heating temperature on the transformation beh avior in a near-equiatomic NiTi alloy has been studied by means of electr- ical resistance measurement,X-ray diffraction and TEM techniques.It is show that the transformation behavior of the alloy is remarkably influenced by the constrained-heating temperature.Only martensitic transformation occurs on heating or cooling in the sample without constrained-heating.But the incommensurate transformation and R transformation appear before the mart- ensitic transformation on cooling in the sample constrained-heating at 100℃ and 450℃ respectively.The transformation behavior is the same as that of the sample without constrained-heating when increasing the constrained-he- ating temperature to 550℃.The cause for the difference of the transformat- ion behavior has been discussed and is believed to be mainly related to the characteristics of the initial stress field induced by constrained-heating in the parent phase.

关 键 词：NITI合金 约束加热 相变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]