|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solid State Precipitation
||Effect of Ca Additions on the Ageing Behavior of Mg-15Gd-0.5Zr Alloy
||Houwen Chen, Chenglong Liu, Jian-Feng Nie
|On-Site Speaker (Planned)
Mg-Gd-based alloys with Gd content more than 10 wt.% exhibit obvious precipitation hardening and high strength. The additions of elements, such as Zn and Ag, can enhance the age-hardening response of Mg-Gd binary alloys by the formation of additional precipitates on the basal plane of Mg matrix phase. In this presentation we will provide a detailed investigation of Ca additions on the ageing behavior of the Mg-15Gd-0.5Zr alloy. The results show that Ca additions slightly increase the age-hardening response of Mg-15Gd-0.5Zr alloy, which is attributed to the formation of basal precipitate plates with a crystal structure different from those reported in Zn- or Ag-containing Mg-Gd alloys. The basal precipitate plates co-exist with β′ phase in the peak-aged condition, and grow with ageing time. Ca atoms also segregate to β′ and β phases in the over-aged condition.
||Planned: Supplemental Proceedings volume