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Strengthening mechanisms and deformability of nanotwinned AlMg alloys

机译：纳米孪晶AlMg合金的强化机理和可变形性

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摘要

AlMg alloys have widespread industrial applications. Grain refinement techniques have been frequently used to achieve high strength in these alloys. Here, we report on the fabrication of epitaxial co-sputtered AlMg thin films with high-density growth twins. The microstructure evolution with varying Mg composition has been characterized. Nanoindentation and in-situ micropillar compression tests show that the strength of AlMg alloys increases with increasing Mg composition. The flow stress of epitaxial nanotwinned Al-10 at.% Mg thin film exceeds 800 MPa. The modified Hall-Petch plots incorporating the solid solution strengthening effect suggest that, compared to high angle grain boundaries, incoherent twin boundaries are equivalent barriers to the transmission of dislocations in nanotwinned AlMg alloys.
机译：AlMg合金具有广泛的工业应用。晶粒细化技术已经常用于在这些合金中实现高强度。在这里，我们报告与高密度生长双胞胎外延共溅射AlMg薄膜的制造。已经表征了具有变化的Mg组成的微观结构演变。纳米压痕和原位微柱压缩试验表明，AlMg合金的强度随Mg组成的增加而增加。外延纳米孪晶Al-10 at。％Mg薄膜的流变应力超过800 MPa。结合固溶强化作用的修正霍尔-普奇图表明，与高角度晶界相比，不相干的孪晶界是纳米孪晶AlMg合金中位错传递的等效障碍。

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  • 来源
    《Journal of Materials Research》 |2018年第22期|3739-3749|共11页
  • 作者

    Xue Sichuang; Li Qiang; Fan Zhe; Wang Han; Zhang Yifan; Ding Jie; Wang Haiyan; Zhang Xinghang;

  • 作者单位

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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