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Microstructure evolution of extruded Mg-Gd-Y magnesium alloy under dynamic compression

查看全文 作　　者：Mao Ping-[1]li;Yu Jin-[1]cheng;Liu [1]Zheng;Dong [1]Yang 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2013年第1卷第1期,共12页高影响力期刊 基　　金：the financial support from the Ministry of Science and Technology of People’s Republic of China(National Basic Research Program of China,No:2011BAE22B05;Research and evaluation of magnesium alloy protection,connectivity and reliability);a Science and Technology Plan of Liaoning Province,China,No:201202160;Research of the mechanism of ASB in AZ31 Magnesium alloy under high speed impact. 摘　　要：For the purpose of investigating the microstructure evolution and deformation behavior of magnesium under high strain rates,the Split Hopkinson Pressure Bar(SHPB)apparatus was used under high strain rates from 755 s^(-1) to 2826 s^(-1) in the present work at room temperature.The microstructures of extruded Mg-Gd-Y Magnesium alloy under different strain rates and along different compression directions were observed by metallographic microscope.The results show that,microstructures of extruded Mg-Gd-Y Magnesium alloy along ED,TD and ND compression directions are sensitive to strain rates.The amount of twins firstly increases and then decreases with strain rates being increased,and the recrystal grains increase and grow up.When the strain rate reaches 2500 s^(-1),the adiabatic shear band(ASB)begins to form.The formation process of the adiabatic shear band can be divided into three stages.In the first stage,under the impact load a great deal of twins form and the deformation mechanism is twinning.In the second stage,discontinuous ASB forms due to twins adjusting the directions of located grains and the deformation mechanisms are twinning and non-basal slip.In the last stage,non-basal slip turns to basal slip and continuous ASB forms.The dynamic compression fracture mechanism of extruded Mg-Gd-Y Magnesium alloy is multi-crack propagation. 关 键 词：Magnesium alloy SHPB Microstructure evolution ASB Deformation mechanism
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