Mg-9Gd-4Y-0.6Mn合金在293~723 K时 的变形行为及微观组织演变

来源期刊：中南大学学报(自然科学版)2006年第2期

论文作者：张新明 彭卓凯 邓运来 陈健美 蒋浩

文章页码：223 - 228

关键词：Mg-9Gd-4Y-0.6Mn合金;孪生;滑移;动态再结晶

Key words：Mg-9Gd-4Y-0.6Mn alloy; twinning; slip; dynamic recrystallization

摘    要：研究Mg-9Gd-4Y-0.6Mn合金在应变速率为0.01 s^-1、变形温度为293~723 K时的压缩塑性变形行为,并在光学显微镜下观察合金在不同变形温度下的表面滑移线及孪生变形形貌与内部微观组织。研究结果表明:合金流变应力应变曲线在不同温度呈现出不同的形状,加工硬化、动态回复和动态再结晶在不同的温度各自起到了重要的作用;在523 K以上时非基面滑移已被激活,形变孪生在296~723 K范围都存在,在673 K以上出现动态再结晶;动态再结晶晶粒优先在原始晶界和粗大第二相粒子处形核,同时在723 K还观察到晶界弓出形核和“孪生”动态再结晶现象。

Abstract: The plastic deformation behavior of Mg-9Gd-4Y-0.6Mn alloy was investigated by compression at 293 723 K and 0.01 s-1. The surface deformation relief and the internal microstructure of the alloy at different deformation temperatures were analysed by optical microscopy. Theresults show that the flow curves exhibit different shapes at different temperatures, and that work-hardening, dynamic recovery and dynamic recrystallization operate respectively at different temperatures. The non-basal slip is activated at above 523 K, twinning exits at 293 723 K, and dynamic recrystallization appears at above 673 K. The dynamic recrystallization (DRX) grains nucleate preferentially at initial grain boundaries and coarse particles, and in addition the nucleation by bulging of initial grain boundaries and“twinning”DRX at 723 K are observed.