Mechanical Properties and Microstructure of an Al-Zn-Mg-Sc-Zr Alloy Processed by Warm Equal Channel Angular Pressing and Subsequent Aging
Mechanical Properties and Microstructure of an Al-Zn-Mg-Sc-Zr Alloy Processed by Warm Equal Channel Angular Pressing and Subsequent Aging
复制标题
温等通道角压制及后续时效加工的 Al-Zn-Mg-Sc-Zr 合金的力学性能和显微组织
DOI：
10.1007/s11837-017-2616-z
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发表时间：
2018-11
期刊：
影响因子：
2.6
通讯作者：
Zhimin Yin
中科院分区：
文献类型：
--
作者：
Lei Tang;Guofu Xu;Ying Deng;Hao Gan;Aibin Ma;Zhimin Yin
采用热等径角挤压（ECAP）和冷轧相结合的方法制备了Al-Zn-Mg-0.1Sc-0.1Zr超细晶合金。通过透射电镜观察合金在变形过程和时效过程中的组织演变。结果表明：变形后合金晶粒明显细化，位错密度明显增大；拉伸试验结果表明，冷轧Al-Zn-Mg-Sc-Zr合金的屈服强度为~ 456 MPa，极限抗拉强度为~ 469 MPa，延伸率为16.7%。经过16道次ECAP后，合金强度达到较高（YS: ~ 526 MPa, UTS: ~ 589 MPa），伸长率降至~ 11.7%。经16道次ECAP时效后，样品的YS和UTS分别提高到~ 594 MPa和~ 606 MPa，伸长率保持在~ 10%的适当水平。讨论了ECAP及后续时效过程中的主要强化机制和组织演变。
An ultrafine-grained Al-Zn-Mg-0.1Sc-0.1Zr alloy was obtained by warm equal channel angular pressing (ECAP) and cold rolling. The microstructure evolution of the alloy during deformation and after subsequent aging was investigated by transmission electron microscopy. The results showed that the alloy grains were remarkably refined and that the dislocation density considerably increased after serve deformation. Tensile tests revealed that the yield strength (YS), ultimate tensile strength (UTS) and elongation of the cold-rolled Al-Zn-Mg-Sc-Zr alloy were ~ 456 MPa, ~ 469 MPa and 16.7%, respectively. After 16 ECAP passes, higher strength (YS: ~ 526 MPa, UTS: ~ 589 MPa) was achieved, with the elongation decreasing to ~ 11.7%. After optimal aging, the YS and UTS of the sample subjected to 16 ECAP passes increased to ~ 594 MPa and ~ 606 MPa, respectively, maintaining an appropriate elongation of ~ 10%. The main strengthening mechanisms and microstructure evolution during ECAP and subsequent aging was discussed.
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