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Abstract: TiNi shape memory alloy(TiNi SMA) is brazed to stainless
steel(SS) by using silver-based filler metal with Ag 50%～68%, Cu
10%～30%, Zn 12%～20% and Sn 0%～10% and by means of laser welder. The
microstructures and properties of brazing joint are studied by means of
adjusting technological parameters(laser output power and brazing time).
The results showed that the AgCuZnSn filler metal is good for the
wettability to brazing TiNi SMA and SS. Joint interface between filler
metal and TiNi SMA is smooth and compact. A reaction layer is formed
between filler metal and SS. There are important influences of brazing
technological parameters on the microstructures and properties of TiNi
SMA heat affected zone. The higher effective heat input will result in
grain growth, hardness reducing and plasticity increasing in the heat
affected zone of TiNi SMA. The high joint tensile strength, shape memory
effect and superelasticity could be obtained by strictly controlling
brazing technological parameters.
Key words: TiNi shape memory alloy Stainless steel Brazing
Microstructures Properties
CLC No: TG425
吉林省自然科学基金资助项目(20000518).
Received 20040411, received in revised form 20020040902
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