Mechanical and shape memory properties of triply periodic minimal surface (TPMS) NiTi structures fabricated by selective laser melting

Abstract

Additive manufacturing (AM) of NiTi parts by selective laser melting method is emerging as a widespread technique for implant and biomedical applications. With SLM, it is possible to fabricate complex porous parts with tailored shape memory and material properties (e.g elastic modulus, ductility, transformation stress, strain). In this study, NiTi samples with three distinct periodic geometrical structures (i.e., Schwartz, Diamond, and Gyroid) were fabricated by SLM and their morphological, mechanical and shape memory properties were systematically characterized. It was revealed that porous NiTi SMA can show the recoverable strain of 7% with low Young's Modulus and their properties can be adjusted with porosity characteristics.