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Microstructures and fatigue fracture behavior of an Al-Cu-Mg-Ag alloy with addition of rare earth Er

机译：添加稀土元素的Al-Cu-Mg-Ag合金的显微组织和疲劳断裂行为

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摘要

The effects of rare earth erbium (Er) on microstructures and fatigue fracture behavior of an Al-Cu-Mg-Ag alloy were investigated. Microstructural examinations first revealed that the precipitation kinetics of Ω phase was distinctly retarded by promoting the formation of θ' phase with the Er addition during the initial aging. The fatigue crack propagation resistance of Er-containing microstructure was significantly enhanced arising from the presence of the crystallographic secondary cracks, which was directly relative to the large grain size. Results also suggested that the dendritic substructure of as-cast Al-Cu-Mg-Ag alloy was refined remarkably by Er addition.
机译：研究了稀土元素on对Al-Cu-Mg-Ag合金组织和疲劳断裂行为的影响。显微组织检查首先显示，在初始时效过程中，通过添加Er促进了θ'相的形成，Ω相的沉淀动力学受到明显的阻碍。含Er的显微组织的疲劳裂纹扩展阻力由于晶体学二次裂纹的存在而显着增强，这与大晶粒尺寸直接相关。结果还表明，通过添加Er可以显着改善铸态Al-Cu-Mg-Ag合金的树枝状亚结构。

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  • 来源
    《Materials Science and Engineering》 |2010年第8期|1806-1814|共9页
  • 作者

    Song Bai; Zhiyi Liu; Yuntao Li; Yanhui Hou; Xu Chen;

  • 作者单位

    Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, People's Republic of China School of Material Science and Engineering, Central South University, Changsha 410083, People's Republic of China;

    Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, People's Republic of China School of Material Science and Engineering, Central South University, Lu Mountain South Road, Hunan, Changsha 410083, People's Republic of China;

    Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, People's Republic of China School of Material Science and Engineering, Central South University, Changsha 410083, People's Republic of China;

    Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, People's Republic of China School of Material Science and Engineering, Central South University, Changsha 410083, People's Republic of China School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China;

    Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, People's Republic of China School of Material Science and Engineering, Central South University, Changsha 410083, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    Al-Cu-Mg-Ag alloy; microstructures; fatigue fracture behavior; Er;

    机译：Al-Cu-Mg-Ag合金;微观结构疲劳断裂行为;尔;

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