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Impact-induced twinning in a magnesium alloy under different stress conditions

机译：在不同应力条件下镁合金中的冲击诱导孪晶

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摘要

We investigate deformation twinning in a highly textured magnesium alloy plate of Mg-3.1%Al-0.9%Zn-0.4%Mn under edge-on impact with in situ, synchrotron-based, ultrafast X-ray diffraction measurements, and corresponding stress states are simulated with the finite element method. Deformation twinning and its anisotropy under the triaxial stress condition are explained by a statistical analysis of resolved shear stress. The critical resolved shear stress criterion is applicable under complicated stress conditions induced by high strain rate impact loading. Three typical simple stress conditions are further explored as verification and application cases: uniaxial-stress, uniaxial-strain, and plane-stress. Extension twinning in the magnesium alloy is prone to occur for impact loading applied perpendicular to the crystallographic c-axis, regardless of the exact stress conditions.
机译：我们在边缘碰撞下的Mg-3.1％Al-0.9％Zn-0.4％Mn的高度纹理化镁合金板中调查孪晶的变形，与原位，同步辐射，超快X射线衍射测量和相应的应力状态是 用有限元法模拟。 通过分辨剪切应力的统计分析解释了在三轴应力条件下的变形孪生及其各向异性。 临界分离的剪切应力标准适用于高应变率冲击载荷引起的复杂应力条件下。 三种典型的简单压力条件进一步探索为验证和应用案例：单轴应力，单轴应变和平面应力。 无论精确应激条件如何，镁合金中均突破镁合金中的延伸孪晶用于垂直于晶体C轴的冲击载荷。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141360.1-141360.7|共7页
  • 作者

    Y.Y. Zhang; Y.F. Xu; Z.D. Feng; T. Sun; K. Fezzaa; M.X. Tang; S. Chen; S.N. Luo;

  • 作者单位

    The Peac Institute of Multiscale Sciences Chengdu Sichuan PR China;

    The Peac Institute of Multiscale Sciences Chengdu Sichuan PR China;

    The Peac Institute of Multiscale Sciences Chengdu Sichuan PR China;

    Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA;

    Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA;

    School of Materials Science and Engineering Southwest Jiaotong University Chengdu Sichuan PR China;

    The Peac Institute of Multiscale Sciences Chengdu Sichuan PR China;

    School of Materials Science and Engineering Southwest Jiaotong University Chengdu Sichuan PR China;

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

    Resolved shear stress; Deformation twinning; Transient X-ray diffraction; Magnesium alloys; Impact loading;

    机译：解决剪切应力;变形孪生;瞬态X射线衍射;镁合金;冲击载荷;

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