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On the Micro-deformation Mechanism of Shape Memory Alloy under Complex Thermo-mechanical Loading Conditions and its Applications

复杂热机械载荷条件下形状记忆合金微变形机理及其应用

基本信息

批准号：
11650088
负责人：
TOKUDA Masataka
金额：
$ 2.37万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650088/
关键词：
shape memory alloy martensite phase transformation nucleation of variant complex loading microscopic observation thie-walled tube experiment 2-way shape memory effect smart materials microscopic 簿肉円管実験バリアント構成方程式 2方向形状記憶効果顕微鏡観察

项目摘要

Summary of Research Results : The present industrial/engineering application of shape memory alloy has been rather limited to the uniaxial deformation, e.g., the simple linear actuating movement using the simple elongation-contraction. On the other hand, the shape memory alloy can be expected to deform in more complex and elegant way, judging from the fundamental deformation mechanism of shape memory alloy. That is, the fundamental deformation mechanism of shape memory alloy is the martensite phase transformation (and its reverse phase transformation). This phase transformation is controlled by 7 independent- parameters, that is, the temperature and the stress tensor whose number of independent components is 6. The aim of this research work is to investigate fundamentally and systematically the role of 7 parameters and to develop the industrial applications of shape memory alloy, for examples, the three-dimensional actuator, complex device, intelligent material systems using these actuators and devices. In this research work, the various kind of combined loads of axial force and torque were applied to the thin-walled tubular specimen of Cu-based shape memory alloy and the corresponding deformation performances were observed. Moreover, the new microscopic observation system was constructed, and the behavior of martensite variant under complex loading conditions was observed. In these fundamental experimental investigations, numerous important data were collected, which are very important for the analysis of the relationship among the nucleation, growth and disappearance of martensite variant in the crystal grain under the complex loading conditions.

研究成果综述：目前形状记忆合金的工业/工程应用主要局限于单轴变形，如简单的伸缩运动。另一方面，从形状记忆合金的基本变形机理来看，形状记忆合金将以更复杂、更优雅的方式变形。也就是说，形状记忆合金的基本变形机制是马氏体相变(及其逆相变)。这种相变是由7个独立参数控制的，即温度和应力张量，它们的独立分量数为6。本研究的目的是从根本上系统地研究7个参数的作用，并开发形状记忆合金的工业应用，例如三维驱动器、复杂器件、使用这些驱动器和器件的智能材料系统。本研究对铜基形状记忆合金薄壁管状试件施加各种轴向力和扭矩的组合载荷，观察其变形性能。此外，还建立了新的微观观察系统，观察了马氏体在复杂加载条件下的变化行为。在这些基础性的实验研究中，收集了大量的重要数据，这些数据对于分析复杂加载条件下晶内马氏体变量的形核、长大和消失之间的关系是非常重要的。