|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Functional, Energy, and Magnetic Materials
||Anisotropy in Thermo-mechanical Properties of NiTi Alloy Processed by Selective Laser Melting (SLM)
||Keyvan Safaei, Mohammadreza Nematollahi, Parisa Bayati, Fatemeh Kordizadeh Zavareh, Hossein Abedi, Mohammad Elahinia
|On-Site Speaker (Planned)
Selective laser melting (SLM) is a free-form additive manufacturing (AM) method showing remarkable progress in fabricating shape memory alloys. The SLM process parameters make an eminent role in the microstructure of the fabricated parts. The high thermal gradient toward the building direction results in a textured microstructure along <001> direction and columnar grain morphology toward the building direction that is the main source of the anisotropic behavior of the SLM NiTi. In this work, the thermomechanical behavior of the additively manufactured NiTi coupons through selective laser melting method is investigated under torsion, compression, and tension. The X-ray diffraction patterns confirm the strong texture along <001> direction along the building direction. The specimens show a remarkable anisotropic thermomechanical behavior. The stress-strain responses show a dissimilar transformation behavior including critical stress and recoverable strain in different stress states. The in-situ strain monitoring also shows the strain localization in all samples.
||Additive Manufacturing, Phase Transformations, Mechanical Properties