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采用雾化-双辊急冷法和热挤压工艺,成功地制备了快速凝固/粉末冶金(RS/PM)Mg-6wt%Zn、Mg-6wt%Zn-5wt%Ce和Mg-6wt%Zn-5wt%Ce-1.5wt%Ca合金,并对合金的压缩变形行为进行了研究,其中测试温度为25～300℃,初始应变速率为5×10-4/s。结果表明,合金的变形行为强烈依赖于变形温度。合金中细小、弥散的析出相为主要的非位错型障碍物,可能是造成合金硬化的主要原因;而随着温度的升高,软化机制的激活会引起合金变形行为的不同。其中,位错的交滑移、攀移以及晶界滑动可能是软化的主要原因。
The rapid solidification / powder metallurgy (RS / PM) Mg-6wt% Zn, Mg-6wt% Zn-5wt% Ce and Mg-6wt% Zn- 5wt% Ce-1.5wt% Ca alloy. The compressive deformation behavior of the alloy was studied. The test temperature was 25 ~ 300 ℃ and the initial strain rate was 5 × 10-4 / s. The results show that the deformation behavior of the alloy strongly depends on the deformation temperature. The small, dispersed precipitates in the alloy are the main non-dislocation-type obstacles, which may be the main reason for the alloy hardening. With the increase of the temperature, the activation of the softening mechanism will cause the deformation behavior of the alloy to be different. Among them, the dislocation cross-slip, climbing and grain boundary sliding may be the main reason for softening.