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Effects of two-stage creep-aging processing on mechanical properties of an Al-Cu-Mg alloy

机译：两阶段蠕变时效工艺对Al-Cu-Mg合金力学性能的影响

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摘要

Two-stage creep-aging behavior of an Al-Cu-Mg alloy are studied by uniaxial tensile creep tests ovei wide ranges of temperature and external stress. Effects of creep-aging temperature and external stress on mechanical properties are discussed. It is found that the mechanical properties of the studied Al-Cu-Mg alloy are strongly sensitive to the creep-aging parameters. The two-stage creep-aging processing can change the characteristics of aging precipitates and dislocations, which greatly affects the mechanical properties of the studied Al-Cu-Mg alloy. With the increase of the second stage creep-aging temperature the yield strength increases, while the ultimate tensile strength and elongation decrease. Meanwhile, the yield strength decreases with the increase of external stress. However, the ultimate tensile strength anc elongation first increase and then decrease when the external stress is continuously increased within the tested conditions. Additionally, the mechanical properties of the two-stage creep-aged alloy are bettei than those of one-stage creep-aged and stress-free aged alloys.
机译：通过单轴拉伸蠕变试验研究了铝-铜-镁合金的两阶段蠕变时效行为，该试验在较宽的温度和外部应力范围内进行。讨论了蠕变时效温度和外应力对机械性能的影响。发现所研究的Al-Cu-Mg合金的机械性能对蠕变时效参数非常敏感。两阶段蠕变时效处理可以改变时效析出物和位错的特征，这极大地影响了所研究的Al-Cu-Mg合金的力学性能。随着第二阶段蠕变时效温度的升高，屈服强度增加，而极限抗拉强度和伸长率降低。同时，屈服强度随着外应力的增加而降低。但是，当外部应力在测试条件下连续增加时，极限抗拉强度伸长率首先增加，然后减小。另外，两阶段蠕变时效合金的机械性能比一阶段蠕变时效和无应力时效合金的机械性能更好。

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  • 来源
    《Materials & design》 |2015年第8期|127-135|共9页
  • 作者

    Y.C. Lin; Guan Liu; Ming-Song Chen; Jia Li; Mi Zhou; Hua-Min Zhou;

  • 作者单位

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Light Alloy Research Institute of Central South University, Changsha 410083, China,State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Light Alloy Research Institute of Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Light Alloy Research Institute of Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Light Alloy Research Institute of Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Light Alloy Research Institute of Central South University, Changsha 410083, China;

    State Key Laboratory of Material Processing and Die & Mould Technology, Wuhan 430074, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Two-stage creep-aging; Alloy; Mechanical properties; Aging precipitates;

    机译：两阶段蠕变老化;合金;机械性能老化沉淀;

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