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Precipitation strengthening mechanisms during natural ageing and subsequent artificial aging in an Al-Mg-Si-Cu alloy

机译：Al-Mg-Si-Cu合金在自然时效和随后的人工时效过程中的析出强化机制

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摘要

An Al-Mg-Si-Cu alloy was water quenched after solute heat treatment at 540 ℃ for 1 h, followed by natural aging and subsequent artificial aging. The hardness measurement and tensile tests show that the hardness and yield strength increased slightly after 7 days natural aging. However, applying natural aging could decrease the peak hardness and yield strength during subsequent artificial aging. For peak aged condition, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) observation revealed that the β" precipitates in the natural aged sample are much smaller in size and volume fraction than that of sample without natural aging, resulting in a better elongation and a decline of peak-aging hardness and yield strength. It seems that the formation of Mg-Si clusters induced by natural aging is beneficial for the hardness and yield strength, and the clusters still occupied a mount of Mg, Si atoms and quenched-in vacancies during artificial aging, which inhibited the precipitation and growth of β" phase. Moreover, the precipitation strengthening effect of the β" phase was quantitatively evaluated by Orowan mechanism.
机译：Al-Mg-Si-Cu合金在540°C进行溶质热处理1“ h之后，进行水淬，然后自然时效，然后进行人工时效。硬度测量和拉伸试验表明，自然老化7天后，硬度和屈服强度略有增加。但是，进行自然时效会降低随后的人工时效的峰值硬度和屈服强度。对于峰值时效条件，透射电子显微镜（TEM）和高分辨率透射电子显微镜（HRTEM）观察表明，自然老化样品中的β“沉淀物的尺寸和体积分数比未自然老化样品的小得多。延展性好，峰值时效硬度和屈服强度下降，似乎是由自然时效引起的Mg-Si团簇的形成对硬度和屈服强度是有利的，而且该簇团仍然占据了一定量的Mg，Si人工时效过程中的原子和淬火空位，抑制了β“相的沉淀和生长。另外，通过Orowan机理定量评价了β”相的析出强化效果。

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  • 来源
    《Materials Science and Engineering》 |2018年第may2期|53-59|共7页
  • 作者

    Shuoxun Jin; Tungwai Ngai; Gongwang Zhang; Tongguang Zhai; Shian Jia; Liejun Li;

  • 作者单位

    National Engineering Research Center of Near-Net-Shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou;

    National Engineering Research Center of Near-Net-Shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou;

    Department of Chemical and Materials Engineering, University of Kentucky;

    Department of Chemical and Materials Engineering, University of Kentucky;

    Center for Aluminum Technology, University of Kentucky;

    National Engineering Research Center of Near-Net-Shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou;

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  • 正文语种 eng
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  • 关键词

    Al-Mg-Si-Cu alloy; Natural aging; Mechanical properties; Precipitation strengthening;

    机译：Al-Mg-Si-Cu合金;自然时效;力学性能;析出强化;

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