界面组织特征
(吉林大学 材料科学与工程学院，长春 130025)
摘 要:
关键字: TiNi形状记忆合金；不锈钢；激光钎焊；界面结构
between TiNi shape memory alloy and stainless steel
（School of Materials Science and Engineering, Jilin University,Changchun 130025, China）
Abstract:Microstructure and interfacial structure of laser-brazed joint between TiNi shape memory alloy (SMA) and stainless steel (SS) were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The brazing seam primarily consists of α-Ag solid solution, α′-Cu solid solution and eutectic structures. Three continuous reaction layers form between the silver-based filler metal and SS during laser brazing and are austenite (A), martensite (M), A + M and α-Ag + α′-Cu + M, respectively. The reaction layer between the filler metal and TiNi SMA is mainly composed of Ti(Ni, Cu) and (Ni, Cu)Ti2 compounds.
Key words: TiNi shape memory alloy; stainless steel; laser brazing; interfacial structure
