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Superplastic behavior of a severely deformed Mg-6Gd-3Y-0.5Ag alloy

机译：严重变形的Mg-6GD-3Y-0.5AG合金的超级塑性行为

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摘要

An extruded Mg-6Gd-3Y～0.5Ag magnesium alloy was processed by the simple shear extrusion (SSE) technique at 553 K for 1, 2, 4 and 6 passes to refine the microstructure. The electron back scattered diffraction (EBSD) analysis was used to investigate the microstructural evolutions of the alloy after the SSE processing. The grain orientation spread (GOS) maps revealed that by increasing the SSE passes, the fraction of the fine dynamically recrystallized (DRXed) grains increased accordingly from 3% after 1 pass of SSE to about 81% after 6 passes. The fraction of low angle grain boundaries (LAGBs) was relatively high in the early stages of the SSE processing, due to occurrence of dynamic recovery (DRV), but it began to drop significantly after 4 and 6 SSE passes, as the DRX proceeded. Therefore, continuous dynamic recrystallization (CDRX) was identified as the governing recrystal-lization mechanism during SSE at 553 K. The shear punch testing (SPT) was carried out at different temperatures and under various shear strain rates to assess the superplastic behavior of the alloys. It was found that only the alloy processed by 6 SSE passes exhibited superplastic flow, for which a maximum strain rate sensitivity (SRS) index of 0.45 and an average activation energy of 112 kJ mol~(-1) were obtained. Accordingly, grain boundary sliding (GBS) associated with the diffusion of grain boundaries was suggested to be the prevalent deformation mechanism during the superplastic flow of the 6-pass SSEed condition. Moreover, the SPT results revealed that as the SSE pass number increases the maximum SRS indices increase and shift to the lower temperatures indicating the rise in the contribution of the GBS mechanism. The kernel average misorientation (KAM) maps delineated that after SPT at 623 K the fine equi-axed DRXed grains were almost strain-free without any change in their shape for the 6-pass SSEed condition, while the one after 2 SSE passes was comprised of extremely deformed grains along the SPT loading direction.
机译：通过在553k的简单剪切挤出（SSE）技术以1,2,4和6的通过以进行挤出的Mg-6GD-3〜0.5Ag镁合金以改善微观结构。使用回散射衍射（EBSD）分析来研究SSE处理后合金的微观结构演进。晶粒取向扩散（GOS）地图显示，通过增加SSE通过，细动态再结晶（Drxed）颗粒的一部分在SSE的1次通过后的3％下增加3％至约81％。由于动态恢复（DRV）的发生，低角度晶界（LAGBS）的比率在SSE处理的早期阶段相对较高，但在4和6个SSE通过后，它开始显着下降，因为DRX进行。因此，在553k期间将连续的动态再结晶（CDRX）鉴定为控制在SSE期间的控制重结晶机制。剪切冲头测试（SPT）在不同的温度下进行，并在各种剪切应变速率下进行评估合金的超塑性行为。发现仅在6个SSE通过的合金才表现出过度塑性流量，其中获得了0.45的最大应变率灵敏度（SRS）指数和112kJMol〜（-1）的平均活化能。因此，建议与晶界的扩散相关的晶界滑动（GBS）是在6遍阶段条件的超塑性流动期间是普遍的变形机构。此外，SPT结果表明，随着SSE通过号码增加最大SRS指数，增加并转移到较低温度，表明GBS机制贡献的增加。内核平均误导（Kam）地图描绘了623k的SPT后，细平轴下的Drxed晶粒几乎没有任何改变它们的6通过SSEED条件的形状，而2个SSE通过后的一个。沿SPT装载方向极其变形的晶粒。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140616.1-140616.15|共15页
  • 作者

    A. Rezaei; R. Mahmudi; C. Cayron; R.E. Loge;

  • 作者单位

    School of Metallurgical and Materials Engineering College of Engineering University of Tehran North Kargar Street Tehran 14395-515 Iran;

    School of Metallurgical and Materials Engineering College of Engineering University of Tehran North Kargar Street Tehran 14395-515 Iran;

    Laboratory of Thermomechanical Metallurgy PX Group Chair Ecole Polytechnique Federate de Lausanne (EPFL) CH-2002 Neuchatel Switzerland;

    Laboratory of Thermomechanical Metallurgy PX Group Chair Ecole Polytechnique Federate de Lausanne (EPFL) CH-2002 Neuchatel Switzerland;

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  • 正文语种 eng
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  • 关键词

    Superplasticity; Grain boundary sliding; Simple shear extrusion; Shear punch testing; Dynamic recrystallization; Mg-Gd-Y alloys;

    机译：超塑性;晶界滑动;简单的剪切挤压;剪切打孔测试;动态再结晶;Mg-Gd-Y合金;

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