Material and mechanical properties of NiTi shape memory alloys strongly depend on the fabrication process parameters and the resulting microstructure. In selective laser melting, the combination of parameters such as laser power, scanning speed, and hatch spacing determine the microstructural defects, grain size and texture. Therefore, processing parameters can be adjusted to tailor the microstructure and mechanical response of the alloy. In this work, NiTi samples were fabricated using Ni50.8Ti (at.%) powder via SLM PXM by Phenix/3D Systems and the effects of processing parameters were systematically studied. The relationship between the processing parameters and superelastic properties were investigated thoroughly. It will be shown that energy density is not the only parameter that governs the material response. It will be shown that hatch spacing is the dominant factor to tailor the superelastic response. It will be revealed that with the selection of right process parameters, perfect superelasticity with recoverable strains of up to 5.6% can be observed in the as-fabricated condition.

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Published in Proceedings of SPIE, v. 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, article 105960W, p. 1-7.

© 2018 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Narges Shayesteh Moghaddam, Soheil Saedi, Amirhesam Amerinatanzi, Ehsan Saghaian, Ahmadreza Jahadakbar, Haluk Karaca, and Mohammad Elahinia, "Selective laser melting of Ni-rich NiTi: selection of process parameters and the superelastic response," Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 105960W (March 22, 2018). DOI: https://doi.org/10.1117/12.2305247

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The authors would like to acknowledge the financial support provided for the project “Nitinol Commercialization Accelerator” and TVSF awards.