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Dynamic microstructural evolution in Mg-4Zn-2Al-2Sn alloy during hot deformation

机译：Mg-4Zn-2Al-2Sn合金热变形过程中的动态组织演变

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摘要

The dynamic microstructural evolution of the Mg-4Zn-2Al-2Sn (ZAT422) alloy during hot deformation was studied. The compression tests were carried out under the strain rate of 0.01 s~(-1) and 5 s~(-1) at 548 K and the strain rate of 5 s~(-1) at 648 K. It was shown that the operating mechanisms of dynamic re-crystallization (DRX) of ZAT422 alloy during hot deformation were affected by both strain rate and temperature. Parallel or crossed {1012} tension twins appeared in the sample deformed to the strain of 0.04 under the strain rate of 0.01 s~(-1) at 548 K, while new grains with characteristics of discontinuous dynamic recrystallization (DDRX) occurred at corrugated grain boundaries. With the strain rate increasing from 0.01 s~(-1) to 5s~(-1) the effect of twin dynamic recrystallization (TDRX) increased, and necklace structure of DRXed grains formed along the original grain boundaries and the deformation twin boundaries. When the temperature increased to 648 K, continuous dynamic recrystallization (CDRX) occurred within the recrystallized grains, resulting in the further refinement of the microstructure. And it should be noted that TDRX still occurred at this temperature.
机译：研究了Mg-4Zn-2Al-2Sn（ZAT422）合金在热变形过程中的动态组织演变。压缩试验是在548 K的0.01 s〜（-1）和5 s〜（-1）的应变速率和648 K的5 s〜（-1）的应变速率下进行的。 ZAT422合金热变形过程中动态重结晶（DRX）的工作机理受应变速率和温度的影响。样品在548 K下以0.01 s〜（-1）的应变速率变形至0.04应变时，出现了平行或交叉的{1012}拉伸孪晶，而波纹状晶粒中出现了具有不连续动态重结晶（DDRX）特征的新晶粒边界。随着应变速率从0.01 s〜（-1）增加到5s〜（-1），孪晶动态再结晶（TDRX）的效果增强，DRX晶粒的项链结构沿原始晶界和形变孪晶界形成。当温度升至648 K时，在重结晶晶粒内会发生连续动态重结晶（CDRX），从而使显微组织进一步细化。应当指出的是，TDRX仍在此温度下发生。

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  • 来源
    《Materials Science and Engineering》 |2016年第7期|393-398|共6页
  • 作者

    Dongqing Zhao; Yuansheng Yang; Jixue Zhou; Yu Liu; Chengwei Zhan;

  • 作者单位

    Shandong Key Laboratory for High Strength Lightweight Metallic Materials, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China,Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China,Shandong Academy of Sciences, Keyuan Road No. 19, Jinan, China;

    Shandong Key Laboratory for High Strength Lightweight Metallic Materials, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China,Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;

    Shandong Key Laboratory for High Strength Lightweight Metallic Materials, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China;

    Shandong Key Laboratory for High Strength Lightweight Metallic Materials, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China,Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloy, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China;

    Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloy, New Materials Research Institute, Shandong Academy of Sciences, Jinan, China;

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  • 正文语种 eng
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  • 关键词

    Mg-4Zn-2Al-2Sn alloy; Hot deformation; Microstructural evolution; Dynamic recrystallization;

    机译：Mg-4Zn-2Al-2Sn合金;热变形;微观结构演变;动态重结晶;

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