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The skin effect and the yielding behavior of cold chamber high pressure die cast Mg-Al alloys

机译：冷室高压压铸镁铝合金的集肤效应和屈服行为

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摘要

The volume fraction of material that remained elastic as yielding developed in cast-to-shape tensile specimens of binary alloys with Al contents between 0.47 and 11.6mass% was calculated using the Kocks-Mecking method of analysis. In the most dilute alloys the elastic fraction decreased rapidly to zero at a well-defined stress, suggesting that yielding was uniform across the specimen, whereas in the concentrated ones it decreased gradually over a wide range of stresses, suggesting that yielding developed first in the softer core of the casting while the harder outer layer, or skin, remained elastic. Comparison with specimens of the concentrated alloys which had a surface layer removed showed that the strain hardening behavior of the core resembled that of full specimens of the most dilute alloy. The maximum amount of elastic material in comparison with the most dilute alloy was used to define the area fraction covered by the skin, for each alloy. The skin covered between ～10% and ～30% of the cross section, the greater values for the concentrated alloys. The skin imposed an elastic constraint that delayed the development of full plasticity at the core.
机译：使用Kocks-Mecking分析方法计算在Al含量在0.47至11.6mass％之间的二元合金的铸型拉伸试样中，随着屈服而保持弹性的材料的体积分数。在大多数稀合金中，在明确定义的应力下弹性分数迅速下降至零，这表明在整个试样中屈服是均匀的，而在浓缩合金中，屈服应力在很大的应力范围内逐渐下降，这表明屈服首先在合金中发展。铸件的芯较软，而较硬的外层或蒙皮则保持弹性。与去除了表面层的浓缩合金试样的比较表明，芯部的应变硬化行为与最稀合金的完整试样相似。与最稀合金相比，弹性材料的最大量用于定义每种合金皮肤所覆盖的面积分数。蒙皮覆盖了横截面的约10％到约30％，浓缩合金的值更大。皮肤施加了弹性约束，延迟了核心的完全可塑性的发展。

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  • 来源
    《Materials Science and Engineering》 |2012年第30期|p.49-55|共7页
  • 作者

    K. Vanna Yang; C.H. Caceres; A.V.Nagasekhar; M.A.Easton;

  • 作者单位

    ARC Centre of Excellence for Design in Light Metals, Materials Engineering School of Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia;

    ARC Centre of Excellence for Design in Light Metals, Materials Engineering School of Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia;

    ARC Centre of Excellence for Design in Light Metals, Materials Engineering School of Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia;

    CAST Co-operative Research Centre, Department of Materials Engineering Monash University, Melbourne, VIC, 3800, Australia;

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  • 正文语种 eng
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  • 关键词

    high pressure die casting; kocks-mecking model; skin effect; micromechanics; magnesium alloys; strain hardening;

    机译：高压压铸;塞克斯模型皮肤效果微力学镁合金应变硬化;

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