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Microstructure and texture evolution of the β-Mg17A12 phase in a Mg alloy with an ultra-high Al content

查看全文 作　　者：Changjian [1]Yan;Yunchang [1,2]Xin;Ce [3]Wang;Huan [3]Liu;Qing [1,2]Liu 高影响力作者 机构地区：[1]International Joint Laboratory for Light Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China;[2]Research Center for Light-weight and High-performance Materials,Nanjing Tech University,Nanjing 210009,China;[3]College of Mechanics and Materials,Hohai University,Nanjing 211100,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2020年第52卷第17期,共11页高影响力期刊 基　　金：supported by the Natural Science Foundation of China(51871032);Graduate Research and Innovation Foundation of Chongqing,China(Grant No.CYB17004);Fundamental Research Funds for the Central Universities(2019CDQYCL032);the“111”Project(B16007)by the Ministry of Education。 摘　　要：In the present study,the effects of equal channel angular pressing(ECAP)on the microstructure and mechanical property of the Mg-20Al alloy were systematically investigated.For the first time,the texture of Mg17Al12 phase and its evolution with ECAP conditions were reported.The results show that increasing the processing temperature and passes generates more uniform distribution and finer size ofβ-Mg17Al12 phases.The large pieces ofβ-Mg17A12 phases are composed of many fine grains with different crystallographic orientations.For theβ-Mg17A12 phase,a preferred distribution of(001)appears at 523 K and 573 K,and hardly varies with temperature.Nevertheless,a random texture is observed at 623 K.The(0002)poles exhibit a preferred distribution at 473 K,but this preferred distribution varies with temperature.A random distribution of(0002)poles is observed when processed at 623 K.Many types of crystallographic planar relationship betweenβ-Mg17A12 phase andα-Mg matrix are observed and the relationships of{11-23}//{100}or{110}or{111}and{1-211}//{100}or//{110}or{111}have a relatively higher frequency than others.The texture ofα-Mg matrix is much different from that of the ECAPed Mg alloys with a relative low Al content,in which a texture with basal poles inclining approximately 45°away from the extrusion direction often develops.The mechanical properties of Mg-20Al alloy are closely related to the temperature and passes of ECAP.A higher temperature often decreases the yield strength,but hardly alters the maximum strength.There is a low plasticity for all the samples and increasing processing temperature slightly enhances the plasticity.The corresponding mechanisms were deeply discussed. 关 键 词：Mg alloy ECAP Mg17Al12 phase Texture evolution
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