Temperature Effects on the Microstructures of Mg-Gd-Y Alloy Processed by Multi-direction Impact Forging

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 243-251
• 页数: 9页
• 语种: 英文

摘要

A high strain rate multi-directional impact forging (MDIF) was applied to a solutionized Mg-Gd-Y-Zr alloy in the temperature range of 350-500 ℃.Results demonstrate that the dominant deformation mode is twinning at a temperature below 400 ℃,whereas at a medium temperature of 450 ℃ considerable continuous dynamic recrystallization was promoted by {10-12} extension twins.At a higher temperature of 500 ℃,twinning activation was suppressed.New DRX grains were observed but their sizes were much bigger than those resulting from the MDIFed 50 passes at 450 ℃,which are ascribed to the larger grain boundary mobility and atomic diffusion at 500 ℃.Moreover,a non-basal weak texture was gained afterward MDIF at each temperature,which is credited to the MDIF process and the minor strain applied in each pass.