Journal of Alloys and Compounds | 2019
Effect of Zn addition on dynamic recrystallization behavior of Mg-2Gd alloy during high-temperature deformation
Abstract
Abstract The effect of Zn/Gd ratio on dynamic recrystallization (DRX) of Mg–2Gd–xZn (x\u202f=\u202f0, 1, 2 and 3\u202fwt%) alloys was investigated by shear punch tests in the temperature range of 623–723\u202fK and shear strain rate range of 1.0\u202f×\u202f10−2–1.2\u202f×\u202f10−1 s−1. It was observed that at low Zn/Gd ratio, excessive co-segregation of Gd and Zn solute atoms retards recrystallization and provides higher strength. At high Zn/Gd ratios, precipitation reduces the co-segregation, so that the alloy with Zn/Gd\u202f=\u202f1.5, experienced the fastest DRX and the lowest strength. In addition, segregation resulted in a weaker texture, by elimination of nucleation and growth of the preferred orientations.