Effect of aging temper on the thermal stability of Al–Cu–Mg–Ag heat-resistant alloy
Effect of aging temper on the thermal stability of Al–Cu–Mg–Ag heat-resistant alloy
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DOI：
10.1016/j.matdes.2012.10.039
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发表时间：
2013-04
影响因子：
8.4
通讯作者：
Xiao-yan Liu;Q. Pan;Liyun Zheng;Q. Fu;Fei Gao;Meixia Li;Yongmei Bai
中科院分区：
文献类型：
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作者：
Xiao-yan Liu;Q. Pan;Liyun Zheng;Q. Fu;Fei Gao;Meixia Li;Yongmei Bai
通过热暴露和蠕变性能测试了Al-Cu-Mg-Ag合金的热稳定性。结果表明，欠时效Al-Cu-Mg-Ag合金的热稳定性优于峰时效Al-Cu-Mg-Ag合金，其原因在于强化相的二次析出。随着热暴露量或蠕变时间的增加，欠时效试样中析出相的数量先增加后减少，而峰时效试样中析出相的数量逐渐减少。欠时效试样的抗拉强度随热暴露时间的增加先增加后降低，暴露20 h后达到峰值524 MPa，比峰时效试样的抗拉强度高19 MPa。欠时效试样的稳态蠕变速率比峰值时效试样低得多，蠕变寿命比峰值时效试样长得多，表明欠时效试样具有良好的高温抗蠕变性能。
The thermal stability of Al–Cu–Mg–Ag alloy was tested by thermal exposure and creep performance. The results show that the under-aged Al–Cu–Mg–Ag alloy possessed better thermal stability compared to the peak-aged one, due to the secondary precipitations of the strengthening phases. The number of the precipitations in the under-aged sample increased and then decreased with increasing the thermal exposure or creep time while that of the peak-aged sample decreased gradually. The tensile strength of the under-aged sample increased and then decreased with increasing the thermal exposure time with a peak value of 524MPa after exposed for 20h, which was 19MPa higher than that of the peak-aged alloy. The steady creep rate of the under-aged sample was much lower and the creep-life was much longer to that of the peak-aged one, indicating that the under-aged sample possessed excellent creep resistance property at elevated temperatures.