摘要
研究最后一道次压下量对铸态WE43镁合金在480℃直接热轧过程中位错滑移和孪生行为的影响。结果表明,在480℃轧制时柱面<á>滑移始终是主要的滑移模式。另外,不同压下量下激活的孪生类型不同。较小的压下量(2%)下激活的主要是{1012}拉伸孪生,而在较大的压下量(12%和20%)下激活的主要是{1011}压缩孪生和{1011}−{1012}二次孪生。Schmid因子计算表明,{1012}孪晶变体选择遵循Schmid定律,而{1011}孪晶变体选择不遵循Schmid定律。即使单道次压下量达到20%也几乎没有发现动态再结晶晶粒,这可能是因为没有达到动态再结晶所需要的变形量。
The effect of rolling reduction of the last pass on the dislocation slip and twinning behavior during direct hot rolling of a cast WE43 magnesium alloy at 480℃ was investigated.The results showed that prismatic<á>slip was always the main deformation mode during rolling at 480℃.In addition,the activated twinning type was associated with rolling reduction.The{1012}extension twinning was activated at a slight rolling reduction(2%),while{1011}compression twinning and{1011}−{1012}double twinning were activated at larger rolling reduction(12%and 20%).Schmid factor calculation showed that the activation of{1012}extension twin variants followed the Schmid Law,whereas the activation of{1011}compression twin variants did not follow it.Even if the rolling reduction reached 20%,almost no dynamic recrystallization(DRX)grains were found,presumably because the amount of deformation required for DRX to occur was not reached.
作者
李乾坤
闫宏
陈荣石
Qian-kun LI;Hong YAN;Rong-shi CHEN(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)
基金
financially supported by the Natural Science Foundation of Liaoning Province, China (No. 2020-MS-004)
the National Natural Science Foundation of China (Nos. 51601193, 51701218)
the National Key Research and Development Program of China (No. 2016YFB0301104)
the State Key Program of National Natural Science of China (No. 51531002)。
关键词
镁合金
变形
孪晶变体
再结晶
magnesium alloy
deformation
twin variants
recrystallization