CuAlNi单晶形状记忆合金压缩特性的实验研究

Experimental Study on Compressive Characteristic of CuAINi Single Crystal Shape Memory Alloy

具有相变伪弹性特性的CuAlNi单晶是目前应用最广泛的形状记忆合金之一。这种材料被广泛应用在工程、生物和医学科学等领域。由于单晶是各向异性,没有多晶中晶粒之间的相互作用,因而在特定晶向上的力学性能稳定。但是这种材料的一些基本性质,如压缩状态下马氏体的发生、生长和传播等还没有人详细研究。本文主要研究CuAlNi单晶在特定晶向上的变形过程,它的应力-应变特性,并利用特殊的显微成像系统首次获得了沿[110]方向压缩时二维马氏体的发生、生长和传播过程。

Super elastic single crystal CuAINi is one of the most popular shape memory alloys in the world. It has been widely used in engineering, biomechanics and medical science. Its mechanical characteristic is stable in selected crystal orientation as there is no mutual action among the polycrystal particle due to the anisotropic of single crystal. But some of its basic properties such as martensitic transformation of CuAINi single crystal under compression and also their generation, nucleation and propagation of transformation band are not completely investigated. In this paper, the deformation of CuAINi shape memory single crystal was reported under compression loading for selected crystal orientation. The stress-strain properties were also got when it is compressed. Two-dimentional microscope images of martensitic band were observed clearly with special CCD system for the first time.