|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Functional, Energy, and Magnetic Materials
||Effect of Process Parameters on the Microstructure and Properties of Additively Manufactured NiTi-Based Shape Memory Alloys
||Sujith Kumar S, Lakhindra Marandi, Indrani Sen
|On-Site Speaker (Planned)
Laser engineered net shaping (LENS) based additive manufacturing (AM) technique appears promising for producing complex shaped components with required properties in a single step. NiTi-based shape-memory-alloys having pseudoelastic properties are particularly suitable to be manufactured by LENS. This unique material is a popular candidate for different niche applications such as cardio-vascular stents and sensors. In this investigation various process parameters are varied to achieve different levels of laser energy densities for LENS. Corresponding effects on microstructure and phase evolution of the NiTi alloys are evaluated thoroughly. Subsequently, mechanical properties are assessed implementing macro-, micro- and nano-indentations with load levels varying over five orders of magnitude and indenter tip geometry varying from sharp Berkovich to blunt spherical as well as by tensile testing. The systematic investigation documents that optimum combination of microstructure, phase evolution and mechanical properties including pseudoelasticity can be attained only upon carefully controlling the AM process parameters.
||Additive Manufacturing, Mechanical Properties, Biomaterials