选择性激光熔化制备的NiTi形状记忆合金的微观结构、转变行为及功能特性简述

Wang Xiebin, Kustov Sergey, Van Humbeeck Jan

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jingshi Road 17923, Jinan 250061, China.

School of Materials Science and Engineering, Shandong University, Jingshi Road 17923, Jinan 250061, China.

Materials (Basel). 2018 Sep 11;11(9):1683. doi: 10.3390/ma11091683.

Due to unique functional and mechanical properties, NiTi shape memory alloys are one of the most promising metallic functional materials. However, the poor workability limits the extensive utilization of NiTi alloys as components of complex shapes. The emerging additive manufacturing techniques provide high degrees of freedom to fabricate complex structures. A freeform fabrication of complex structures by additive manufacturing combined with the unique functional properties (e.g., shape memory effect and superelasticity) provide great potential for material and structure design, and thus should lead to numerous applications. In this review, the unique microstructure that is generated by selective laser melting (SLM) is discussed first. Afterwards, the previously reported transformation behavior and mechanical properties of NiTi alloys produced under various SLM conditions are summarized.

由于具有独特的功能和力学性能，镍钛形状记忆合金是最有前途的金属功能材料之一。然而，其加工性能较差限制了镍钛合金作为复杂形状部件的广泛应用。新兴的增材制造技术为制造复杂结构提供了高度的自由度。通过增材制造实现复杂结构的自由成型，并结合独特的功能特性（如形状记忆效应和超弹性），为材料和结构设计提供了巨大潜力，因此有望带来众多应用。在本综述中，首先讨论了选择性激光熔化（SLM）产生的独特微观结构。随后，总结了先前报道的在各种SLM条件下制备的镍钛合金的相变行为和力学性能。