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首页> 外文期刊>Materials Science and Engineering >Influence of Nd or Ca addition on the dislocation activity and texture changes of Mg-Zn alloy sheets under uniaxial tensile loading
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Influence of Nd or Ca addition on the dislocation activity and texture changes of Mg-Zn alloy sheets under uniaxial tensile loading

机译：Nd或Ca的添加对单轴拉伸载荷下Mg-Zn合金薄板位错活性和织构变化的影响

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摘要

In situ hard X-ray diffraction experiments were carried out to investigate the dislocation slip activity of Mg-1 wt. % Zn-based alloys containing Nd or Ca during tensile loading. Diffraction patterns collected during tensile loading at 3 temperatures were analyzed using a convolutional multiple whole profile fitting procedure. High activation of nonbasal a and pyramidal c +a dislocations was found in the Nd- and Ca-containing alloys. The microstructure evolution after 10% deformation was examined by complementary EBSD measurements. The microstructure evolution was related to the differences in the initial texture and active deformation modes, according to the alloying and temperature. In-grain misorientation axes analysis obtained from the EBSD measurements confirms that the addition of Nd or Ca contributes to the higher activity of prismatic a slip. The high activity of prismatic a slip leads to a broadening of the basal poles perpendicular to the loading direction and a strengthening of the 10(1)over bar0 pole along the loading direction. The overall dislocation density evolution at elevated temperatures is controlled by dynamic recovery and dynamic recrystallization. These thermally activated mechanisms are retarded in the Nd- or Ca-containing alloys.
机译：进行了原位硬X射线衍射实验，以研究Mg-1的位错滑移活性。在拉伸载荷期间含有Nd或Ca的％Zn基合金。使用卷积多重整体轮廓拟合程序分析了在3个温度的拉伸载荷过程中收集的衍射图样。在含Nd和Ca的合金中发现了非基本位错和金字塔型c + a位错的高度活化。通过互补的EBSD测量检查了10％变形后的微观结构演变。根据合金化和温度的不同，微观组织的演变与初始织构和主动变形模式的差异有关。通过EBSD测量获得的晶粒内取向轴分析证实，Nd或Ca的添加有助于棱柱形滑移的较高活动性。棱柱形滑移的高活动性导致垂直于载荷方向的基极变宽，并沿载荷方向增强<10 <（1）over bar> 0>极。高温下总体位错密度的变化受动态恢复和动态重结晶控制。这些热活化机理在含Nd或Ca的合金中受阻。

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  • 来源
    《Materials Science and Engineering》 |2019年第22期|138053.1-138053.11|共11页
  • 作者

    Ha Changwan; Bohlen Jan; Yi Sangbong; Zhou Xiaohua; Brokmeier Heinz-Guenter; Schell Norbert; Letzig Dietmar; Kainer Karl Ulrich;

  • 作者单位

    Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagiC, Max Planck Str 1, D-21502 Geesthacht, Germany;

    Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagiC, Max Planck Str 1, D-21502 Geesthacht, Germany;

    Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagiC, Max Planck Str 1, D-21502 Geesthacht, Germany;

    Tech Univ Clausthal, Inst Mat Sci & Engn IWW, Agr Str 6, D-38678 Clausthal Zellerfeld, Germany;

    Tech Univ Clausthal, Inst Mat Sci & Engn IWW, Agr Str 6, D-38678 Clausthal Zellerfeld, Germany;

    Helmholtz Zentrum Geesthacht, DESY, HZG Outstn, Notkestr 85, D-22607 Hamburg, Germany;

    Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagiC, Max Planck Str 1, D-21502 Geesthacht, Germany;

    Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr MagiC, Max Planck Str 1, D-21502 Geesthacht, Germany;

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  • 正文语种 eng
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  • 关键词

    Magnesium; Microstructure; Texture; Dislocation; Synchrotron; EBSD;

    机译：镁;微观结构;织构;位错;同步加速器;EBSD;

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