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《Journal of Heilongjiang Institute of Technology》 2012-01
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Effect of extrusion temperature on microstructure and mechanical properties of ZM6 magnesium alloys prepared by a solid recycling process

WEN Li-hua,REN Zhong-xian,WANG Bao-qin,TANG Yu-ling,LIU Ying,WANG Jin-ling(School of Mechanical and Engineering,Heilongjiang Institute of Technology,Harbin 150050,China)  
ZM6 magnesium alloy was prepared by hot extrusion of machined chips at 350 ℃,400 ℃,450 ℃ and 500 ℃ with an extrusion ratio of 25∶1;subsequently its microstructure and mechanical properties were investigated.The results indicate: some coarse intermetallic phases of the alloy were broken into small particles and moved from grain boundaries to grain interiors during the hot extrusion process.A large number of small particles were dispersed in the matrix of the magnesium alloys.The samples that were extruded at 450 ℃ and 500 ℃ exhibit partial dynamic recrystallization.Tensile strength is greatly improved and elongation increases with the extruding temperature increasing.The ultimate tensile strength,0.2% proof stress and the elongation of ZM6 magnesium alloys extruded at 500 ℃ are 300.2 MPa,142.9 MPa and 30%,respectively.Fracture mode of the alloy was transgranular dimple fracture.
【Fund】: 黑龙江省教育厅科学技术研究面上项目(11551387)
【CateGory Index】: TG146.22
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