In this work, superelastic response of laser welded NiTi wires were studied using nanoindentations and cyclic tensile tests. At high power laser condition ~0.4 wt% of Ni content evaporated, which resulted in the formation of the martensite phase due to about 40 °C shift in the A_f temperature. This caused in 500 nm residual depth after the cyclic load-unload nanoindentation test and 1.9% residual strain after the cyclic tensile test, both signs of superelasticity deterioration. However, by adopting the possible lowest power laser condition, these parameters became 200 nm and 1%, respectively. By increasing the cyclic tensile test temperature to 60 °C (above A_f), similar superelastic responses were achieved due to the elimination of any unfavorable martensite phases inside their fusion zones.

在这项工作中，使用纳米压痕和循环拉伸试验研究了激光焊接NiTi线的超弹性响应。在高功率激光条件下，约0.4 wt％的镍含量蒸发，由于A _f温度约40°C的转变，导致马氏体相的形成。这导致在循环加载/卸载纳米压痕测试后的500 nm残余深度和在循环拉伸测试后的1.9％残余应变，这都是超弹性下降的迹象。但是，通过采用可能的最低功率激光条件，这些参数分别变为200 nm和1％。通过将循环拉伸试验温度提高到60°C（高于A _f），由于消除了其融合区内任何不利的马氏体相，因此获得了类似的超弹性响应。