|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Functional, Energy, and Magnetic Materials
||Additive Manufacturing of Functionally Graded Shape Memory Alloys
||Mohammadreza Nematollahi, keyvan Safaei, Parisa Bayati, Mohammad Elahinia
|On-Site Speaker (Planned)
It is well-known that NiTi shape memory alloys’ properties are highly composition and structure-dependent. Additionally, we have previously shown that processing NiTi through additive manufacturing (AM) techniques can be used to tailor properties such as transformation temperatures and microstructures through varying process parameters (PPs). In this study, two sets of PPs were used to additively manufacture a functionally graded NiTi using one initial powder feed with 50.8 at. % of Ni. The monolithic superelastic-shape memory part was characterized through DSC, XRD, SEM, and optical microscopy, and mechanical testing. One set of PPs resulted in an austenite finish temperature of 21 C, which suggested superelastic behavior at room temperature, while the other portion showed shape memory effect with Af of 86 C. XRD analysis confirmed the SE and SMA phases at room temperature consistent with the mechanical and DSC results. In-situ strain observations revealed the evolution of stress-strain in the part.
||Additive Manufacturing, Characterization, Phase Transformations