|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||A Combinatorial Approach to Investigate Abnormal Grain Growth Behavior in Cu-Al-Mn Shape Memory Alloys
||Hyoungrok Lee, Sheng Xu, Toshihiro Omori, Ryosuke Kainuma
|On-Site Speaker (Planned)
Abnormal grain growth (AGG) can be induced by the cyclic heat treatment (CHT) through the β(bcc) ↔︎ α(fcc) phase transformation in the Cu-Al-Mn system. The subgrain structure formed around the α precipitates serves as a driving force for AGG of the β phase, and thus, the control of subgrain structure is of importance to obtain a large single crystal. In this study, the effect of composition on AGG was investigated through a combinatorial approach in Cu-Al-Mn. Diffusion couples between Cu-14Al-10Mn and Cu-20Al-10Mn (at%) were prepared and subjected to the CHT. The composition profiles were analyzed by EPMA/WDS, and the microstructures were analyzed using EBSD. The α solvus temperature decreased by increasing the Al concentration and the subgrain size also decreased up to 19.5 at%, meaning increase in the driving force for AGG. Furthermore, the optimal Al composition to obtain a large grain was found.
||Copper / Nickel / Cobalt, Phase Transformations, Process Technology