Effect of hot extrusion process on microstructure and mechanical properties of hypereutectic Al-Si alloys

查看全文 作　　者：Li [1,2]Runxia;Yu [2]Fuxiao;Zuo [2]Liang

机构地区：[1]Shenyang University of Technology, Shenyang 110178, China;[2]Northeastern University, Shenyang 110819, China

出　　处：《China Foundry》索引2011年第8卷第1期,共5页

基　　金：supported by National Natural Science Foundation of China (Grant No. 50971092);Innovation Team Plan pf Liaoning Provincical Education Department (Grant no. 2007T132) 摘　　要：The hypereutectic Al-Si alloy was fabricated by hot extrusion process after solidified under electromagnetic stirring,and the microstructure and mechanical properties of the alloy were studied.The results show that the ultimate tensile strength and elongation of the alloy reached 229.5 MPa and 4.6%,respectively with the extrusion ratio of 10,and 263.2 MPa and 5.4%,respectively with extrusion ratio of 20.This indicates that the mechanical properties of the alloy are obviously improved with the increase of extrusion ratio.After hot extruded,the primary Si,eutectic Si,Mg2Si,AlNi,Al7Cu4Ni and Al-Si-Mn-Fe-Cr-Mo phases are refined to different extent,and the efficiency of refinement is obvious more and more with the increase of extrusion ratio.After T6 heat treatment,the sharp corners of these phases become passivated and roundish,and the mechanical properties are improved.The ultimate tensile strength of the extruded alloy after T6 heat treatment reaches 335.3 MPa with extrusion ratio of 10 and 353.6 MPa with extrusion ratio of 20. 关键词：高级低共熔体的 Al-Si 合金电磁激动人心热挤出过程主要 Si 阶段

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Effect of hot extrusion process on microstructure and mechanical properties of hypereutectic Al-Si alloys

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