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《The Chinese Journal of Nonferrous Metals》 2007-01
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Structure refinement and mechanical properties of Mg-4Al-2Si Mg alloy by reciprocating extrusion

SONG Pei-wei1,2,JING Xiao-tian1,GUO Xue-feng1(1.School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;2.School of Mechanical Engineering,Shanxi University of Technology,Hanzhong 723003,China)  
The effects of reciprocating extrusion deformation on microstructures and properties of Mg-4Al-2Si alloys were studied,and the mechanisms of grain refinement of α(Mg) and Mg2Si particles,as well as the effect of Mg2Si particles on the recrystallization were investigated.The results show that dynamic recrystallization controlled by dislocation climbing takes place during the reciprocating extrusion process.The equiaxed grains are formed by crystal boundary migration,subgrain merge and twist rotation by recrystallization.The grain size decreases and the rate of dynamic recrystallization increases with increasing passes of reciprocating extrusion.The grain sizes of as-cast α(Mg) and Mg2Si particles decrease from 45 and 60 μm to 3 and 1 μm after 6 passes of reciprocating extrusion,respectively.The microstructures are characterized by the fine equiaxed α(Mg) grain with homogeneous distribution of fine Mg2Si particles.The mechanical properties of alloys are improved obviously with increasing reciprocating extrusion passes.
【Fund】: 国家自然科学基金资助项目(50271054);; 陕西省自然科学基金资助项目(2002E110);; 凝固技术国家重点实验室基金资助项目(200301)
【CateGory Index】: TG113.25
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