TiNiNb合金激光焊接接头的组织与性能  

Microstructure and Properties of Laser Welded Joint of TiNiNb Wide Hysteresis Shape Memory Alloy

作　　者：陈庚[1] 赵兴科[1] 陈俐[2] 王蔚[1] 黄继华[1] 张华[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京航空制造工程研究所高能束流加工技术重点实验室,北京100024

出　　处：《热加工工艺》2008年第17期99-101,共3页Hot Working Technology

基　　金：武器装备重点基金资助项目(6104110)

摘　　要：试验研究了TiNiNb宽滞后形状记忆合金Nd:YAG激光焊接的组织与性能。通过光学显微镜、扫描电镜、能谱分析、X射线衍射、硬度测试和拉伸试验对母材和焊缝的微观组织、元素分布、相组成以及接头力学性能进行了研究。结果表明:焊缝主要是由TiNi基体相和β-Nb相组成的共晶组织,β-Nb在TiNi基体相晶界和晶内分布不均匀;接头各区域的显微硬度均高于母材;室温下表现出较高的抗拉强度。用Nd:YAG激光焊接TiNiNb形状记忆合金是一种较理想的焊接方法。The TiNiNb wide hysteresis shape memory alloy was welded by Nd：YAG laser welding. The microstructure and properties of laser welded joint were investigated by OM, SEM, EDS, XRD and the tensile test. The results show that the microstructure of welded joint is mainly composed of TiNi phase and β-Nb phase, β-Nb distribution in the TiNi phase are not uniformity. The hardness of welded joint is higher than base metal and the tensile strength of the welding joint at the room temperature is better. The TiNiNb shape memory alloy is welded by Nd：YAG laser, which is a good method.

关 键 词：TININB合金 激光焊接 微观组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接] TG139.8[一般工业技术—材料科学与工程]