|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Technology 2018
||C-74: Microstructure and Mechanical Behavior of ECAP-processed Magnesium at the Ice-water Temperature
||Dai Zuo, Diaoyu Zhou, Taotao Li, Wei Liang, Fuqian Yang
|On-Site Speaker (Planned)
Magnesium of high purity is processed by equal channel angular pressing (ECAP) up to 8 passes at the ice-water temperature. The microstructure and mechanical behavior of the ECAP-processed magnesium are studied. The ECAP processing leads to the formation of fine, equiaxed grains of ~1 μm. The basal planes initially parallel to the extrusion direction evolve to strong basal planes with tilting angle in the range of 25°-45° to the extrusion direction. Increasing the number of passes leads to the decreases of twins and dislocation density, while the dislocation density is still very high in individual grains after eighth passes. The large decreases of twins and dislocation density make dynamic recrystallization (DRX) difficult, leading to the decrease of the degree of DRX. Tension test reveals that the mechanical behavior of the ECAP-processed Mg is dependent on the grain size and texture.