| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Formation and Stability of Ni-Y Clusters in Mg85Y9Ni6 Alloys |
| Author(s) |
Hiroshi Okuda, Mikito Ito, Michiaki Yamasaki, Yoshihito Kawamura |
| On-Site Speaker (Planned) |
Hiroshi Okuda |
| Abstract Scope |
Formation and growth of Y-Ni clusters in Mg85Y9Ni6 alloys have been examined by in-situ small- and wide-angle X-ray scattering measurements and EXAFS. Amorphous ribbons have been heated in-situ from room temperature to the melting at the heating rate of 10 K/min. Small clusters were found even in the amorphous state, as is the same for Mg85Y9Zn6 alloys. The distribution of clusters change even in the amorphous region, and then after crystallization, the growth of the cluster became more apparent and reached the size of Y8TM6+interstitial ‘L12 cluster’ as demonstrated for MgYZn alloys. EXAFS measurements showed that the size of the L12 clusters is slightly smaller than that of MgYZn, but still the atomic configurations are the same. These results suggested that the kinetics of LPSO formation in MgYNi alloys are characterized as hierarchical phase transformations as proposed for MgYZn alloys. Difference appeared at the relative stability at higher temperatures. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |