ABSTRACT

In this work, Ni-Ti shape-memory alloy (SMA) plates were laser welded using different laser powers. A systematic trend of decreasing deterioration in nanomechanical properties – including superelastic recovery – from the weld centre, through the interface region and the heat-affected zone to the base–metal regimes has been observed. The extent of the deterioration increases with increasing laser power. The observations are explained in terms of a decreasing cooling rate and increasing austenite finish temperature (A_f) with an increase in laser power.

中文翻译：

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激光焊接 NiTi 形状记忆合金的纳米级超弹性响应

摘要

在这项工作中，Ni-Ti 形状记忆合金 (SMA) 板使用不同的激光功率进行激光焊接。已经观察到从焊接中心、界面区域和热影响区到基体金属区域的纳米力学性能下降（包括超弹性恢复）的系统趋势。劣化的程度随着激光功率的增加而增加。观察结果解释为随着激光功率的增加，冷却速率降低，奥氏体终温 ( A _f ) 增加。