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首页> 外文期刊>Materials Science and Engineering >Superplastic behavior and microstructure evolution of a new Al-Mg-Sc-Zr alloy subjected to a simple thermomechanical processing
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Superplastic behavior and microstructure evolution of a new Al-Mg-Sc-Zr alloy subjected to a simple thermomechanical processing

机译：新型Al-Mg-Sc-Zr合金经过简单热机械加工后的超塑性行为和微观组织演变

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摘要

A new Al-Mg-0.15% Sc-0.10% Zr (wt%) alloy sheet with an average (sub)grain size of ～2.25 nm was processed by a simple thermomechanical processing. Excellent superplastic (elongations of ≥ 800%) can be achieved at a temperature range of 450-500 ℃ and a high strain rate range of 1 × 10~(-2)-1 × 10~(-1) s~(-1). A maximum elongation of ～ 1579% was obtained at 475 ℃ and a high strain rate of 5×10~(-2)s~(-1). Electron back scatter diffraction analysis and transmission electron microscopy results showed that superior superplastic ductility of the Al-Mg-Sc-Zr alloy can be ascribed to the complete transformation of low angle grain boundaries to high angle grain boundaries due to the occurrence of continuous dynamic recrystallization and the presence of stable coherent Al_3Sc_xZr_(1-x) particles that effectively impede the growth of the grains during superplastic deformation. Besides, strong β-fiber rolling textures gradually weakened, and random textures were predominant in the superplastic deformed alloy. Analyses on the superplastic data revealed that the average strain rate sensitivity parameter and the average activation energy of the Al-Mg-Sc-Zr alloy were ～0.48 and ～84.4 kJ/mol~(-1), respectively. All results indicated that the main superplastic deformation mechanism was grain boundary sliding.
机译：通过简单的热机械加工处理了一种新的Al-Mg-0.15％Sc-0.10％Zr（wt％）合金薄板，其平均（亚）晶粒尺寸约为2.25 nm。在450-500℃的温度范围和1×10〜（-2）-1×10〜（-1）s〜（-1）的高应变速率范围内，可以获得优异的超塑性（伸长率≥800％）。 ）。在475℃下获得的最大伸长率为〜1579％，应变率为5×10〜（-2）s〜（-1）。电子背散射衍射分析和透射电镜结果表明，Al-Mg-Sc-Zr合金具有超塑性的超塑性，可以归因于连续动态再结晶的发生，使低角度晶界完全转变为高角度晶界。稳定的相干Al_3Sc_xZr_（1-x）粒子的存在，有效地阻碍了超塑性变形过程中晶粒的生长。此外，超塑性变形合金的强β-纤维滚动织构逐渐减弱，且随机织构占主导地位。对超塑性数据的分析表明，Al-Mg-Sc-Zr合金的平均应变速率敏感性参数和平均活化能分别为〜0.48和〜84.4 kJ / mol〜（-1）。所有结果表明，主要的超塑性变形机制是晶界滑动。

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  • 来源
    《Materials Science and Engineering》 |2016年第4期|205-217|共13页
  • 作者

    Y.L. Duan; L. Tang; Y. Deng; X.W. Cao; G.F. Xu; Z.M. Yin;

  • 作者单位

    School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China ,Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China ,Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China ,State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

    School of Materials Science and Engineering, Central South University, Changsha 410083, China ,Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China;

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  • 正文语种 eng
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  • 关键词

    Al-Mg alloy; Superplasticity; Microstructural evolution; Al_3Sc_xZr_(1-x) particles; Grain boundary sliding;

    机译：铝镁合金;超塑性微观结构演变;Al_3Sc_xZr_（1-x）粒子;晶界滑动;

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