研究了Al-Cu-Mg-Ag-Zr合金高温短时拉伸和热暴露行为及其微观组织.高温拉伸试验结果表明,在150～250 ℃范围内,高温强度下降比较平缓,且250℃下的拉伸强度达到270MPa;在250～300 ℃范围内,高温强度迅速下降.热暴露试验结果表明,在相同时间的条件下,暴露温度从室温至150℃合金的强度和伸长率几乎没有变化,从200～300 ℃合金强度下降,但在200℃热暴露后的拉伸强度仍保持386MPa.透射电镜分析表明,合金欠时效状态由大量细小分布的Ω相及极少量的θ'相组成,随着暴露温度的提高,Ω相长大并粗化,至250℃热暴露后Ω相大幅度减少,无析出带(PFZ)宽化.研究表明,短时高温拉伸条件下,Ω相在250℃下仍能保持稳定,而长时间(100h)热暴露时,Ω相只能在200℃下维持稳定.
参考文献
| [1] | Polmear I J;Couper M J .Design development of an experimental wrought aluminum alloy for use at elevated temperatures[J].Metallurgical & Materials Transactions A:Physical Metallurgy & Materials Science,1988,19(04):1027-1034. |
| [2] | Teleshov V V;Kaputkin E Ya;Golovleva A P et al.Temperature rangers of phase transformations and mechanical properties of alloys of the Al-Cu-Mg-Ag system with various Cu/Mg ratios[J].Metal Science and Heat Treatment,2005,47(3-4):139-144. |
| [3] | 陈大钦,郑子樵,李世晨,陈志国,刘祖耀.外加应力对Al-Cu及Al-Cu-Mg-Ag合金析出相生长的影响[J].金属学报,2004(08):799-804. |
| [4] | 肖代红,王健农,陈世朴,丁冬雁.微量Ag对Al-5.3Cu-0.8Mg合金组织和耐热性能的影响[J].机械工程材料,2003(01):38-40. |
| [5] | D. H. Xiao;J. N. Wang;D. Y. Ding .Effect of Cu content on the mechanical properties of an Al-Cu-Mg-Ag alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2002(1/2):77-81. |
| [6] | Zhu Aiwu;Starke Jr E A;Shiflet G J .An FP-CVM calculation of pre-precipitation clustering in Al-Cu-Mg-Ag alloys[J].Scripta Materialia,2005,53:35-40. |
| [7] | Wang J;Wu X;Xia K .Creep behaviour at elevated temperatures of an Al-Cu-Mg-Ag alloy[J].Materials Science and Enginerring,1997,A234-236:287-290. |
| [8] | Chang CH;Lee SL;Lin JC;Yeh MS;Jeng RR .Effect of Ag content and heat treatment on the stress corrosion cracking of Al-4.6Cu-0.3Mg alloy[J].Materials Chemistry and Physics,2005(2/3):454-462. |
| [9] | R. N. Lumley;A. J. Morton;I. J. Polmear .Enhanced creep performance in an Al-Cu-Mg-Ag alloy through underageing[J].Acta materialia,2002(14):3597-3608. |
| [10] | R. N. Lumley;I. J. Polmear .The effect of long term creep exposure on the microstructure and properties of an underaged Al–Cu–Mg–Ag alloy[J].Scripta materialia,2004(9):1227-1231. |
| [11] | 束德林.金属力学性能[M].北京:机械工业出版社,1995:193-194. |
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