|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Tricky Transformations in an Ion Irradiated Nickel-titanium Alloy
||Alejandro Hinojos, Daniel Hong, Nan Li, Khalid Hattar, Peter Anderson, Michael J Mills
|On-Site Speaker (Planned)
Controlling the martensitic transformation and subsequent mechanical properties in NiTi alloys through standard means of thermal and deformation processing has been probed for decades and has reached its realm of marginal gains. Prior work breaking with tradition utilizing ion irradiation showed little success in NiTi thin films. Using a combination of ion irradiation and plastic deformation crystallographic defects could produce unique heterogeneous microstructures to enhance psuedoelastic properties. Thermally cycled and uncycled NiTi were irradiated with two ion irradiation doses in order to understand the interaction between transformation and irradiation induced defects. In this work we have observed the transformation suppression of the thermal transformation in irradiated NiTi, but an enhancement in the reversible strain of the alloy. Here microstructural (XRD, EBSD, S/TEM) and mechanical (nanoindentation) characterization with in-situ cooling and micropillar testing will be used to assess the irradiation effects and transformation properties.
||Characterization, Mechanical Properties, Phase Transformations