( 1. 華南理工大學(xué) 機(jī)械工程學(xué)院， 廣州 510640;
2. 香港城市大學(xué) 物理及材料科學(xué)系， 香港九龍)
摘 要: 利用熱爆方法來(lái)制備了多孔NiTi形狀記憶合金。 研究了在不同熱爆溫度下制備出的樣品與其機(jī)械性能之間的關(guān)系。結(jié)果表明： 在1223K下熱爆反應(yīng)制備的NiTi合金， 具有大的孔隙度， 高開孔率和基本各向同性，同時(shí)表現(xiàn)出較好的超彈性。 對(duì)斷口分析發(fā)現(xiàn)， 斷裂為脆性斷裂和韌性斷裂的復(fù)合。 這表明改善孔洞分布和形態(tài)， 可以極大地提高多孔NiTi形狀記憶合金的機(jī)械性能和超彈性。
關(guān)鍵字: 多孔NiTi形狀記憶合金；熱爆； 超彈性
（ 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
