激光选区熔化制备镍钛合金的研究进展

镍钛形状记忆合金因其具有良好的力学性能、生物相容性和耐蚀性,被广泛应用于各个领域,尤其是生物医学领域.同时,诸如心血管支架、骨植入物等应用对于成形件的结构及精度都提出了极大的要求.因此,对以SLM为代表的金属3D打印工艺在制备NiTi合金,以及其工艺参数对成形件质量、显微结构、相变温度和力学性能的影响进行了阐述.同时,列举了一些3D打印制备的NiTi合金在生物医学领域的应用实例,并指出了SLM制备NiTi合金存在的问题,最后对其今后的发展趋势进行了展望.

Progress in the preparation of NiTi alloy by selective laser melting

Nickel-titanium shape memory alloys are widely used in various fields, especially in the biomedical field, because of its good mechanical properties, biocompatibility, and corrosion resistance. At the same time, applications such as cardiovascular stents and bone implants have great demands on the structure and precision of the molded parts. Therefore, this paper reviews the preparation of NiTi alloy by metal 3D printing technology such as selective laser melting (SLM), and the influence of process parameters on the quality, microstructure, phase transition temperature, and mechanical properties of the drip molding. Some examples of the application of NiTi alloy prepared by 3D printing in the biomedical field are listed. Finally, the existing problems in SLM preparation of NiTi alloy were summarized, and the development trend of SLM preparation has prospected.