Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

查看全文 作　　者：Jin-Feng [1]Li;Zhi-Hao [1]Ye;Dan-Yang [1]Liu;Yong-Lai [2]Chen;Xu-Hu [2]Zhang;Xiu-Zhi [2]Xu;Zi-Qiao [1]Zheng

机构地区：[1]School of Materials Science and Engineering, Central South University, Changsha 410083, China;[2]Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2017年第30卷第2期,共13页

基　　金：the National High Technology Research and Development Program of China(No.2013AA032401);Teacher’s Research Foundation of Central South University(No.2013JSJJ 001) for the financial support;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Centre 摘　　要：The influence of pre-deformation on aging precipitates of three near peak-aged Al–Cu–Li alloys,1460 alloy with a low Cu/Li ratio(1.46),2050 alloy with a high Cu/Li ratio(4.51) and 2A96 alloy with a medium Cu/Li ratio(2.97),was investigated.The strength of the aged alloys is enhanced by the pre-deformation.The effectiveness of pre-deformation on precipitates is dependent on the alloy's composition.With increasing the pre-deformation,the population density of T1(Al_2Cu Li) precipitates increases in all three Al–Cu–Li alloys and their diameter decreases in 2050 and 2A96 alloys,and the greatest effectiveness is observed in 2A96 alloy.The pre-deformation also increases the population density of θ'(Al_2Cu)precipitates and decreases their diameter in 2050 and 2A96 Al–Li alloys,but the effectiveness is smaller compared to that on T1 precipitates.In 1460 alloy subjected to two-step aging at 130 °C for 20 h followed by 160 °C for 12 h,the main precipitates are δ'(Al_3Li).At 2%–6% pre-deformation,GP-I zones form and pre-deformation displays little influence.Eight percentage pre-deformation promotes θ''/θ' precipitation and increases their population density. 关键词：Al-Li 合金变丑前老化猛抛

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Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

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