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《Materials for Mechanical Engineering》 2013-05
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Effect of Different Aging Treatmrnts on Mechanical Properties and Intergranular Corrosion Properties of Al-0.42Mg-0.50Si-0.99Cu Alloy

YIN De-yan1,3,YANG Fu-liang1,2,HUANG Ke1,2,MA Kai1,2(1.School of Material Science and Engineering;2.Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China; 3.Changsha New Zhensheng Group Co.,Ltd.,Changsha 410100,China)  
A new type of Al-Mg-Si-Cu aluminum alloy was designed,and the alloy composition was Al-0.42Mg-0.50Si-0.99Cu.The effects of different aging treatments on microstructure,mechanical properties and corrosion behavior were studied by optical microscopy,transmission electron microscopy and means of conventional tensile test.The results show that no distinct grain boundary precipitates were observed in T6 under-aging state and the grain boundary precipitates are small and continuously distributed in T6 peak-aging state,and intergranular corrosion was serious.With the increase of aging time,Q′ phase increased and coarsened,the grain boundary precipitates were coarsened obviously and sparsely distributed.In double aging state,there are plenty of Q′ precipitates in matrix,grain boundaries precipitates were spheroidization,the spacing between precipitated phases increased,precipitated phaseand were continuously distributed and the PFZ was broaden.In T6 peak-aging state,the alloy had the most serious intergranular corrosion tendency and had the highest strength,however,the corrosion resistance was obviously improved while tensile strength was a little decrease in double aging state.
【Fund】: 国家“863”高新技术研究资助项目(2003AA332070);; 长沙市科技成果产业化资金专项资助项目(K0902002-11)
【CateGory Index】: TG156.92
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