中文摘要：

基于NbTi-TiNi共晶型相变，经成分分析，通过电弧熔炼制备几种具有NbTi和TiNi记忆合金铸态双相组织的NbTiNi合金。这种合金是一种原位自生的NbTi／TiNi记忆合金复合材料，具有复合比可控（通过调整Ni或Nb含量）、可逆马氏体相变温度可调（通过调整Ti／Ni比例）的特点。通过对其辅以常规的锻造、拔丝等大变形工艺加工，使NbTi和TiNi组元细化至微米级别，进一步得到复合组元比表面大、分布均匀、界面强度高的超细片层NbTi／TiNi记忆合金复合丝材料。通过热膨胀仪和万能拉伸试验机对其进行热膨胀和力学性能测试。结果表明。该复合材料不但具有很高的屈服强度（超过1．6GPa），还具有负膨胀点记忆效应、应变软模效应等新功能特性。

英文摘要：

Based on the eutectic transformation of NbTi-TiNi, a series of hypereutectic NbTiNi alloys with NbTi and TiNi shape memory alloy dual phase structure were designed and obtained by arc melting method. Such alloy is a kind of in-situ NbTi/TiNi shape memory alfoy composite with NbTi matrix and TiNi functional component. The reversible martensitic transformation tem- perature and the volume fraction of the embedded TiNi can be controlled by adjusting the Ti/Ni atomic ratio and Ni （Nb） con- tent of the alloy. After forging and wire drawing the NbTiNi alloy ingots, NbTi and NiTi phases became micron scale lamellas. Then an uhrafine lamellar NbTi/TiNi shape memory alloy composite wire with high yield strength was obtained. As the specific surface area of ultrafine TiNi lamellar is large, and the interface bonding of the NbTi/TiNi phase is much strong, the coupling effect between the NiTi lamellar and NbTi matrix can be represented effectively. The thermal expansion and mechanical proper- ties were tested using dilatometer and universal tensile test machine. The results show that some new functional properties were observed, such as high yield strength（ more than 1.6 GPa）, negative therural expansion point memory effect and strain induced modulus softening effect.