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Microstructure evolution and mechanical properties of an Mg-Gd alloy subjected to surface mechanical attrition treatment

机译:表面机械磨耗处理的Mg-Gd合金的组织演变和力学性能

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摘要

Nanometer-sized grains (around 50-100 nm) were generated in the surface layer (0-30 μm) of an Mg-3Gd alloy by means of surface mechanical attrition treatment (SMAT) at room temperature. The deformation process and the formation mechanism of nano grains were investigated by using transmission electron microscopy. The results show that twinning dominates the initial stage of the plastic deformation when the dislocation slips are obstructed. And till all the coarse grains are divided into substructures by twin-twin interactions and twin-dislocation arrays intersections, dislocation slips and stacking faults begin to play an important role in impelling subgrains to nanograins by lattice rotating through dislocation arrays slipping. Dynamic rotation recrystallization is the primarily formation mechanism of the nanocrystalline of Mg-3Gd alloy by SMAT, which is distinct from the migration recrystallization normally observed in severe plastic deformation process.
机译:通过在室温下通过表面机械磨损处理(SMAT)在Mg-3Gd合金的表面层(0-30μm)中生成纳米级晶粒(约50-100 nm)。利用透射电子显微镜研究了纳米颗粒的形变过程和形成机理。结果表明,当位错滑移受阻时,孪晶主导了塑性变形的初始阶段。并且直到通过双生子相互作用和双位错阵列相交将所有粗晶粒划分为子结构为止,位错滑移和堆垛层错开始在通过位错阵列滑移的晶格旋转将亚晶粒推向纳米晶粒中起重要作用。动态旋转再结晶是通过SMAT进行Mg-3Gd合金纳米晶形成的主要机理,这与在严重塑性变形过程中通常观察到的迁移再结晶不同。

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  • 来源
    《Materials Science and Engineering》 |2015年第10期|146-154|共9页
  • 作者单位

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Key Laboratory of Near Net Forming of Jiangxi Province, Nanchang University, Nanchang 330031, PR China,Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kow-Ioon, Hong Kong, PR China;

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kow-Ioon, Hong Kong, PR China,Centre for Advanced Structural Materials, City University of Hong Kong, Shenzhen Research Institute, Shenzhen 518057, PR China;

    The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;

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

    Surface mechanical attrition treatment; Mg-3Gd alloy; Microstructure evolution; Mechanical properties; Dynamic rotation recrystallization;

    机译:表面机械磨损处理;Mg-3Gd合金;微观组织演变;机械性能动态旋转重结晶;

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