Microstructure and yield phenomenon of an extruded Mg-Y-Cu alloy with LPSO phase

查看全文 作　　者：Guangli [1,2]Bi;Niuming [1,2]Zhang;Jing [1,2]Jiang;Yuandong [1,2]Li;Tijun [1,2]Chen;Wei [3]Fu;Xiaoru [3]Zhang;Daqing [3]Fang;Xiangdong [3]Ding

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;[2]School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;[3]State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Journal of Rare Earths》索引2023年第41卷第3期,共9页

基　　金：Project supported by the National Natural Science Foundation of China(51961021,52001152 and 51901174);China Postdoctoral Science Foundation(2020M673383)。 摘　　要：A yield phenomenon was firstly reported in an extruded Mg-6.8Y-2.5Cu alloy and the corresponding microstructure was also investigated in this work,The cast alloy is mainly composed ofα-Mg,18R long period stacking order(LPSO)phase,eutectic phase(Mg_(20)Cu_(4)Y_(1)),and Mg_(2)Cu phase.The 18R LPSO phase at the dendritic grain boundary transforms into the 14H LPSO phase in the grain interior during homogenization.After extrusion,the grain size of the homogenized alloy is remarkably refined to-3.69μm and the second phase is significantly broken and distributed in the extrusion direction.Tensile testing curves of the extrude alloy at room temperature indicate that the yield strength and ultimate tensile strength increase while the elongation of the alloy decreases with increasing strain rate.Interestingly,a yield plateau fo rms and gradually decreases with increasing strain rate.The yield phenomenon is related to the dislocation multiplication and the interaction between the movable dislocations and solute atoms. 关键词：Extruded Mg-6.8Y-2.5Cu alloy Long period stacking order phase MICROSTRUCTURE Yield phenomenon Rare earths

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Microstructure and yield phenomenon of an extruded Mg-Y-Cu alloy with LPSO phase

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