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首页> 外文期刊>Materials Science and Engineering >The natural aging and precipitation hardening behaviour of Al-Mg-Si-Cu alloys with different Mg/Si ratios and Cu additions
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The natural aging and precipitation hardening behaviour of Al-Mg-Si-Cu alloys with different Mg/Si ratios and Cu additions

机译：不同Mg / Si比和添加Cu的Al-Mg-Si-Cu合金的自然时效和沉淀硬化行为

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摘要

The natural aging and artificial aging behaviours of Al-Mg-Si-Cu alloys with different Mg/Si ratios and Cu additions were investigated using Vickers microhardness measurements, differential scanning calorimetry (DSC) analysis and transmission electron microscopy (TEM) characterisation. Excess Si and Cu additions enhanced the alloy hardening ability during natural (NA) and artificial aging (AA). Alloys with low Cu and high Si contents exhibited higher precipitation hardening than alloys rich in Mg during artificial aging. In contrast, the alloys with high amounts of Cu were less dependent on the Mg/Si ratio during precipitation hardening due to their similar aging kinetics. The main precipitate phases that contributed to the peak-aging hardness were the L, Q' and β" phases. In the over-aging conditions, the alloys rich in Mg and Cu had finer and more numerous precipitates than their Si-rich equivalents due to the preferential precipitation of the L phase. The combination of excess Mg and high Cu resulted in an alloy with a relatively low hardness in T4 temper and a relatively higher hardness after the paint baking cycle. Thus, this alloy has good potential for use in auto body panel applications.
机译：使用维氏显微硬度测量，差示扫描量热法（DSC）分析和透射电子显微镜（TEM）表征，研究了具有不同Mg / Si比和添加Cu的Al-Mg-Si-Cu合金的自然时效和人工时效行为。过量添加的硅和铜可增强合金在自然（NA）和人工时效（AA）中的硬化能力。低铜和高硅含量的合金在人工时效过程中比富镁合金具有更高的沉淀硬化。相反，由于类似的时效动力学，在沉淀硬化过程中，具有大量Cu的合金对Mg / Si比的依赖性较小。导致峰值时效硬度的主要析出相为L，Q'和β“相。在过时效条件下，富含Mg和Cu的合金比其富含Si的当量析出的析出物细而多。过量的Mg和高的Cu的组合导致合金的T4回火硬度较低，而涂料烘烤后的硬度较高，因此具有很好的应用前景。汽车车身面板的应用。

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  • 来源
    《Materials Science and Engineering》 |2015年第11期|119-126|共8页
  • 作者

    Lipeng Ding; Zhihong Jia; Zhiqing Zhang; Robert E. Sanders; Qing Liu; Guang Yang;

  • 作者单位

    College of Materials Science and Engineering, Chongqing University, Chongqing 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400044 China;

    College of Materials Science and Engineering, Chongqing University, Chongqing 400044 China;

    Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Centre for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, China;

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  • 正文语种 eng
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  • 关键词

    Al-Mg-Si-Cu alloy; Natural aging; Microstructure; Precipitates; Strengthening;

    机译：Al-Mg-Si-Cu合金;自然老化;微观结构沉淀物;强化;

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