| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
ISRO-mediated Nucleation in Fcc Alloys during Rapid Melting and Solidification Processes |
| Author(s) |
Julien W. Zollinger, Ivan Cazic, Michel Rappaz, Benoît Appolaire |
| On-Site Speaker (Planned) |
Julien W. Zollinger |
| Abstract Scope |
Kurtuldu et al. have presented a new mechanism of nucleation in fcc alloys based on icosahedral quasicrystals (iQC) or icosahedral short-range order (ISRO) clusters formation in the liquid phase and acting as pre-nuclei for the fcc phase. Such mechanism has been evidenced in Al and Au alloys when minute additions of Cr and Ir, respectively, were added and has led to a drastic reduction of the grain size. It has also been shown that ISRO modifies the growth behavior, inducing a dendrite orientation transition. In the present work, the influence of ISRO on nucleation of various fcc alloys will be presented, with an emphasis on rapid melting and solidification processes. Based on model experiments and detailed EBSD analysis, the mechanisms of feathery grain nucleation in Al-based alloys, of divorced nucleation in Au-based alloys and of columnar-to-equiaxed transition in Ni-based superalloys will be presented. |
| Proceedings Inclusion? |
Planned: |