1. Partitioning of Ca to metastable precipitates in a Mg-rare earth alloy.
- Author
-
Shi, Qianying, Natarajan, Anirudh Raju, Van der Ven, Anton, and Allison, John
- Subjects
PRECIPITATION (Chemistry) ,RARE earth metal alloys ,ALLOYS - Abstract
The potential effect of the element Ca on the precipitation behavior was investigated in an Mg-rare earth alloy. A combination of metastable β′′′ and β′ precipitates was observed for the peak aging condition at 200°C. Ca addition was found to have no significant effect on the precipitating phases and evolution sequence. Composition analysis showed that the Ca partitioned to both β′′′ and β′ precipitate phases. First-principles calculations indicated that Ca partitions to the rare-earth sublattice in the precipitate phase. This finding suggests the potential of Ca to partially replace costly rare-earth elements in precipitation-hardened Mg-rare earth alloys. Both experimental investigation and first-principal calculation in a Mg-Nd-Y-Ca alloy revealed the partitioning of non-rare-earth element Ca to Mg-RE precipitates, suggesting the potential of Ca to enhance precipitation and strength. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF