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| CREEP BEHAVIOR OF Al-Cu-Mg-Ag HEAT-RESISTANT ALLOY AT ELEVATED TEMPERATURE |
| LIU Xiaoyan1), PAN Qinglin1, 2), LU Zhilun1), CAO Sufang1), HE Yunbin1), LI Wenbin1) |
1) School of Materials Science and Engineering, Central South University, Changsha 410083
2) The Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083 |
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Cite this article:
LIU Xiaoyan PAN Qinglin LU Zhilun CAO Sufang HE Yunbin LI Wenbin. CREEP BEHAVIOR OF Al-Cu-Mg-Ag HEAT-RESISTANT ALLOY AT ELEVATED TEMPERATURE. Acta Metall Sin, 2011, 47(1): 53-60.
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Abstract The creep behaviors of heat--resistant alloy Al-5.3Cu-0.8Mg-0.5Ag-0.3Mn-0.15Zr (Al-Cu-Mg-Ag) were studied in a temperature range of 100-210℃ and a load range of 150-300 MPa, and the effect of aging on the properties of Al-Cu-Mg-Ag alloy at elevated temperatures was also investigated. The results show that the steady creep rate of the under-aged alloy is much lower than that of the peak--aged alloy at the same creep conditions. The creep fracture time is 75 h for the under-aged Al-Cu-Mg-Ag alloy at 210℃/200 MPa, while that for the peak-aged alloy is only 21 h. The precipitates grow gradually during the creep process and the growth rate in the peak-aged alloy is higher than that in the under-aged alloy. Dynamic precipitation happened in the under-aged alloy. The fine precipitates inhibite the motion of the dislocations during the creep, which leads to lower creep deformation rate compared to the peak-aged alloy. The steady creep rates of the under-aged Al-Cu-Mg-Ag alloy at 100-150℃ keep a relatively lower level, but increases to a high level when the creep temperature increased to 180℃. The steady creep rate increased with increasing temperature or stress, which can be described by a constitutive equation with an apparent activation energy of 102 kJ/mol.
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Received: 23 July 2010
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| Fund: Supported by Excellent Doctorate Dissertation Foundation of Central South University No.2008yb012) |
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