( 1. 华南理工大学 机械工程学院， 广州 510640;
2. 香港城市大学 物理及材料科学系， 香港九龙)
摘 要: 利用热爆方法来制备了多孔NiTi形状记忆合金。 研究了在不同热爆温度下制备出的样品与其机械性能之间的关系。结果表明： 在1223K下热爆反应制备的NiTi合金， 具有大的孔隙度， 高开孔率和基本各向同性，同时表现出较好的超弹性。 对断口分析发现， 断裂为脆性断裂和韧性断裂的复合。 这表明改善孔洞分布和形态， 可以极大地提高多孔NiTi形状记忆合金的机械性能和超弹性。
关键字: 多孔NiTi形状记忆合金；热爆； 超弹性
（ 1. School of Mechanical Engineering,
South China University of Technology,
Guangzhou 510640, China;
2. Department of Physics and Materials Science,
City University of Hong Kong, Hong Kong, China）
Abstract: The porous NiTi shape memory alloys was prepared by thermal-explosion methods. And the relationship between the specimens prepared at different thermal-explosion temperature and its mechanical properties were investigated. The results show that the NiTi alloy prepared by thermal-explosion methods at 1223K, has high porosity, high open pore ratio and isotropic pore distribution on the whole, and good superelasticity. The mechanism of rupture is the unite of brittle and ductile through observing the surface of rupture. It is proved that the reform of the pore distribution and morphology can improve the mechanical properties and superelasticity of the porous NiTi shape memory alloy.
Key words: porous NiTi shape memory alloys; thermal-explosion; superelasticity
