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Experimental research on creep aging behavior of Al-Cu-Mg alloy with tensile and compressive stresses

机译:拉-压应力状态下Al-Cu-Mg合金蠕变时效行为的实验研究

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摘要

Complex aircraft panels are generally manufactured by creep age forming process (CAF). In CAF, an aluminum panel is mainly subjected to bending, in which one side of the component is in tension and the other side is in compression. The tension and compression creep aging behaviors of Al-Cu-Mg alloy are investigated through creep tests, hardness tests and transmission electron microscope observations. It is found that the creep strains under compressive stresses are smaller than those under tensile stresses. When comparing to the micro-structure of creep-aged alloy, the compressive stress can promote the formation of S phase in aluminum matrix and inhibit the generation of grain boundary precipitates, which leads to the improvement of hardness of the compression creep aged alloy. A unified creep constitutive model to describe the creep aging behavior of 2524 aluminum alloy with different stress roles was established based on the Hyperbolic Sine method, and a good agreement between the experimental results and model predictions is obtained.
机译:复杂的飞机面板通常通过蠕变成形工艺(CAF)制造。在CAF中,铝面板主要受到弯曲,其中组件的一侧处于拉伸状态,另一侧处于压缩状态。通过蠕变试验,硬度试验和透射电镜观察研究了Al-Cu-Mg合金的拉伸和压缩蠕变时效行为。发现在压缩应力下的蠕变应变小于在拉伸应力下的蠕变应变。与蠕变时效合金的显微组织相比,压应力可以促进铝基体中S相的形成并抑制晶界沉淀的产生,从而提高了压缩蠕变时效合金的硬度。基于双曲正弦法建立了描述不同应力作用的2524铝合金蠕变时效行为的统一蠕变本构模型,实验结果与模型预测结果吻合良好。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第13期|54-62|共9页
  • 作者单位

    Light Alloy Research Institute of Central South University, Changsha 410083, PR China,State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China;

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

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

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

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

    Creep age forming; Creep aging behavior; Tensile stress; Compressive stress; Al-Cu-Mg alloy; Unified constitutive model;

    机译:蠕变年龄形成;蠕变老化行为;拉伸应力压应力Al-Cu-Mg合金;统一本构模型;

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