Al-4.72Cu-0.45Mg-0.54Ag-0.17Zr合金高温持久后的剩余室温拉伸性能及组织分析  

Analysis on Microstructure and Residual Intensity of Al-4.72Cu-0.45Mg-0.54Ag-0.17Zr Alloy in High Temperature Lasting

作　　者：夏卿坤[1] 刘志义[1] 余日成[1] 李云涛[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《材料工程》2006年第11期3-8,12,共7页Journal of Materials Engineering

摘　　要：研究了Al-Cu-Mg-Ag合金在165℃时效组织与性能的变化,并分别采用欠时效和峰值时效的试样进行200℃及外加应力为200MPa高温持久实验。结果表明,欠时效态的试样在高温持久下,随时间延长,其剩余强度先上升后下降,强度峰值出现在持久20h。延伸率变化与强度变化基本相似。持久100h后,合金力学性能相对欠时效态无明显下降,显示出优良的热稳定性。合金欠时效的高温持久后的性能优于峰时效态。The microstructure and performance of Al-Cu-Mg-Ag-Zr Alloy aging in 165℃ have been investigated, and the high temperature lasting test is done in 200 ℃ and 200MPa employing underageing （165℃× 2h）and peakageing（165℃ × 6h） samples. The results indicate that with the prolonging of lasting time, the residual stress of underageing samples appears to be increase first and then decrease, and the peaking stress is obtained when lasting for 20h. The variation of ductility of the underageing samples has the same tendency with the variation of residual stress. Compared with underageing condition, the mechanical properties have no obvious variation after lasting for 100h, which represents superior heat-resistance ability. The high temperature lasting performances of underageing are superior to that of peakageing.

关 键 词：AL-CU-MG-AG合金 时效 高温持久 显微组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]