In this study, spherical Ni–Ti composite powder was synthesized from blended elemental Ni and Ti powders using radio frequency plasma spheroidization process. The effects of powder feeding rate and carrier gas flow rate on the spheroidization efficiency and Ni content of the obtained powders were investigated. The spherical Ni–Ti composite powder with a slightly Ti-rich composition was obtained at the optimal feeding rate of 35 g/min and carrier gas flow rate of 3 L/min. In addition to NiTi phase, elemental Ni and Ti powders were also identified in the produced powder. The prepared powder was adopted for laser powder bed fusion densification. Microcracks and pores were observed in the L-PBF-processed samples. In addition to NiTi main phase, un-melted elemental powders, Ti₂Ni and Ni₃Ti phases were found in the microstructure of the printed parts. Based on the DSC analysis, the transformation temperatures of austenitic NiTi to martensite and vice versa were determined.

在这项研究中，球形镍-钛复合粉末从使用射频等离子体球化过程混合元素的Ni和Ti粉末合成。粉末进料速率和在球化效率载气的流速和所获得的粉末的Ni含量的影响。在 35 g/min 的最佳进料速率和 3 L/min 的载气流速下，获得了具有轻微富钛成分的球形 Ni-Ti 复合粉末。除了镍钛相，元素镍和Ti粉末在所产生的粉末也被鉴定。将制得的粉末为激光粉末床融合致密化通过。的L-PBF处理样品中观察到微裂纹和气孔。除了镍钛主相，未熔化的元素粉末，钛₂的Ni和Ni ₃的Ti相在印刷部件的微观结构中发现。根据DSC分析，奥氏体镍钛的相变温度为马氏体，反之亦然进行了测定。