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Effects of calcium on mechanical properties of cellular Al-Cu foams

机译：钙对多孔铝铜泡沫力学性能的影响

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摘要

Cellular Al-2.5Cu and Al-7Cu foams are fabricated by a melt-foaming method utilizing Ca and TiH_2 as the thickening and blowing agent, respectively. No age-hardening effect is observed on the cellular Al-2.5Cu foams during the isothermal aging at 200 ℃, which is distinct from the precipitation behavior of dense Al-Cu alloys. The yielding strength of cellular Al-7Cu foams increases slightly during the same aging treatment. The strength evolutions of a series of dense Al-Cu alloys containing Ca are also investigated to understand the precipitation behavior in cellular Al-Cu foams. The result shows that the unknown Al-Ca-Cu intermetallic compounds can be formed in the as-cast samples. Therefore, there is inadequate Cu in the Al matrix to form the strengthening precipitation during the aging process. Age-hardenable cellular Al-Cu foam could not be obtained by melt-foaming method using Ca as the thickening agent. The crystal structures of the Al-Ca-Cu phases are determined with the Cu content ranging from 2.5% to 9 wt%.
机译：通过熔融发泡法分别使用Ca和TiH_2作为增稠剂和发泡剂来制备多孔Al-2.5Cu和Al-7Cu泡沫。在200℃等温时效过程中，未观察到多孔Al-2.5Cu泡沫的时效硬化作用，这与致密Al-Cu合金的析出行为不同。在相同的时效处理过程中，多孔Al-7Cu泡沫的屈服强度略有增加。还研究了一系列含Ca的致密Al-Cu合金的强度演变，以了解多孔Al-Cu泡沫中的析出行为。结果表明，铸态样品中可能形成未知的Al-Ca-Cu金属间化合物。因此，在时效过程中，Al基体中的铜不足以形成强化沉淀。使用Ca作为增稠剂的熔融发泡法无法获得可老化的蜂窝状Al-Cu泡沫。确定Al-Ca-Cu相的晶体结构，其中Cu含量为2.5％至9wt％。

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  • 来源
    《Materials Science and Engineering》 |2014年第17期|471-478|共8页
  • 作者

    L. Huang; H. Wang; D.H. Yang; F. Ye; S.Q. Wang; Z.P. Lu;

  • 作者单位

    AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    School of Mechanics and Materials, Hohai University, Nanjing 210098, China,Hohai Science & Technology Research Institute Co., Ltd., Changzhou 213164, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

    AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;

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  • 正文语种 eng
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  • 关键词

    Cellular materials; Electron microscopy; Mechanical characterization; Age hardening; Phase transformation;

    机译：蜂窝材料;电子显微镜;机械特性时效硬化;相变;

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