(1. 江西省科學院 江西省銅鎢新材料重點實驗室，南昌 330029；
2. 中國石油大學(北京) 材料科學與工程學院，昌平 102249)
摘 要: 為改善記憶合金復合材料中各復合組元間的耦合作用，利于材料功能特性的展現(xiàn)，原位合成一種NiTi-NbTi記憶合金復合材料。通過對NiTi-NbTi復合材料進行約束態(tài)熱循環(huán)的方式，使樣品中回復力達到應力誘發(fā)馬氏體相變的臨界應力，拉伸復合材料時NiTi直接相變，進而降低復合材料整體的表觀彈性模量。拉伸結果表明：對于同種NiTi-NbTi復合材料，同樣在120 ℃的拉伸溫度下，未經歷約束態(tài)熱循環(huán)的樣品表觀彈性模量為64.5 GPa，而經歷約束態(tài)升、降溫熱循環(huán)樣品的表觀彈性模量為55.2 GPa，彈性模量變化率為14.4%。
關鍵字: NiTi-NbTi復合材料；形狀記憶合金；約束態(tài)馬氏體相變
（1. Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330029, China;
2. Department of Materials Science and Engineering, China University of Petroleum-Beijing, Changping 102249, China）
Abstract:An in-situ NiTi-NbTi shape memory alloy composite was prepared to improve the coupling effect between the matrix and NiTi shape memory alloy and imporve the exhibition of functional properties of the composite. The recovery stress generated by NiTi embedded in the NiTi-NbTi composite can reach its critical transformation stress when it is subject to proper constraint thermal cycle, and therefore, the embedded NiTi can tranform immediately upon loading, which can make that the NiTi-NbTi composite exhibits a much lower apparent modulus. Tensile tests show that the same two samples under the same tenslie test temperature show two different apparent modulus. For the sample underwent constraint thermal cycle, the apparent modulus is 55.2 GPa, whereas, for another one without undergoing constraint thermal cycle, the apparent modulus is 64.5 GPa, and the rate of change is 14.4%.
Key words: NiTi-NbTi composite; shape memory alloy; constraint martensitic transformation
