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Effects of hot rolling processing on microstructures and mechanical properties of Mg-3%Al-1%Zn alloy sheet

机译：热轧工艺对Mg-3％Al-1％Zn合金薄板组织和力学性能的影响

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摘要

The microstructure evolution and deformation mechanisms of AZ31 alloy sheet during hot rolling were investigated. The initial microstructure in the as-received AZ31 sheet shows basal texture with an average grain size of 37 μm. During the subsequent hot rolling processing, dislocation slip occurs in addition to extension, contraction and double twinning, and the twinning mode is dependent on the grain orientation, grain size and rolling temperature. Continuous dynamic recovery and recrystallization (CDRR) is the main mechanism of grain refinement for the AZ31 sheet during hot rolling, and the {-1011} contraction and {-1011} -(10-12) double twinning accelerate the refinement process. Contraction and double twinning have positive effect on grain refinement and texture randomization for the AZ31 alloy during hot rolling. In this study, higher per-pass reduction of 50% and higher rolling temperature of 400 ℃ led to more uniform grain structure with more random texture, which resulted in the higher ductility than that of the sheet samples rolled at 300 ℃ and at per-pass reduction of 30%. Therefore, higher temperatures and larger per-pass reduction rolling are recommended for microstructure optimization and the mechanical properties improvement of the AZ31 sheet.
机译：研究了AZ31合金薄板热轧过程中的组织演变和变形机理。收到的AZ31板材的初始微观结构显示出基本纹理，平均晶粒尺寸为37μm。在随后的热轧过程中，除延伸，收缩和双孪晶外还会发生位错滑移，并且孪晶模式取决于晶粒取向，晶粒尺寸和轧制温度。连续动态恢复和重结晶（CDRR）是热轧过程中AZ31薄板晶粒细化的主要机理，{-1011}收缩和{-1011}-（10-12）双孪晶加速了细化过程。收缩和双孪晶对热轧过程中AZ31合金的晶粒细化和织构随机化具有积极作用。在这项研究中，更高的每道次压下率50％和更高的轧制温度400℃导致晶粒结构更均匀，织构更随机，从而导致其延展性高于在300℃和每通过减少30％。因此，建议使用更高的温度和更大的每道次压下率轧制来优化AZ31板材的微观结构并改善其机械性能。

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  • 来源
    《Materials Science and Engineering》 |2010年第8期|1970-1974|共5页
  • 作者

    L. Jin; J. Dong; R. Wang; L.M. Peng;

  • 作者单位

    National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, P.R. China Key State Laboratory of Metal Matrix Composite, Shanghai jiao Tong University, P.R. China School of Material Sciences and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China;

    National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, P.R. China Key State Laboratory of Metal Matrix Composite, Shanghai jiao Tong University, P.R. China;

    National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, P.R. China Key State Laboratory of Metal Matrix Composite, Shanghai jiao Tong University, P.R. China;

    National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, P.R. China Key State Laboratory of Metal Matrix Composite, Shanghai jiao Tong University, P.R. China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    AZ31 Mg alloy; hot rolling; grain refinement; twinning; texture;

    机译：AZ31镁合金;热轧晶粒细化孪生质地;

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