|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Magnesium Technology 2021
||Microstructure and properties of Mg-Gd-Y-Zn-Zr alloy fabricated by centrifugal casting and ring-rolling process
||Xiaodong Peng, Zhenduo Ma, Guobing Wei, Yan Yang, Tiancai Xu
|On-Site Speaker (Planned)
Ring-shaped Mg-8.5Gd-4Y-1Zn-0.4Zr (wt %) alloy was produced by centrifugal casting and ring-rolling process. The effects of different accumulative ring-rolling reductions on the microstructure, mechanical properties and texture of the alloy were investigated. The results indicate that the as-cast microstructure consists mainly of equiaxed grains and network eutectic phase distributing at the grain boundaries. The ring-rolled alloys exhibit a bimodal microstructure composed of fine dynamic recrystallized (DRXed) grains with weak basal texture and coarse un-DRXed grains with strong basal texture. With the increase of accumulative ring-rolling reduction, the coarse un-DRXed grains are refined and the volume fraction of fine DRXed grains is increased significantly. The mechanical properties of ring-rolled alloy are improved and reach 510 MPa of UTS and 435 MPa of YS after aging. In addition, strengthening mechanism of the alloy is discussed and is related to the bimodal microstructure, mainly concerned with lamellar LPSO phases and dynamic precipitated phases.