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《Heat Treatment of Metals》 2006-07
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Influence of Homogenizing Annealing Process on Microstructure and Mechanical Properties of As-cast AZ80 Magnesium Alloy

GUO Qiang,YAN Hong-ge,CHEN Zhen-hua,WU You-wu(School of Materials Science and Engineering,Hu′nan University,Changsha Hu′nan 410082,China)  
The effects of homogenizing annealing process on the microstructures and properties of AZ80 magnesium alloy were investigated and the fracture of specimens before and after homogenizing annealing was also analysized by SEM.The results show that after homogenizing annealing,dendritic segregation is almost eliminated and the microstructures and properties of alloy are improved.The optimal homogenizing annealing process is at 390 ℃ for 16 h.The precipitating behavior,which depends on the cooling rate,has an effect on the mechanical properties of alloys.The higher the cooling rate,the higher the hardness and strength while the lower the elongation.Fractography demonstrates that the as-cast alloys′ tensile fracture consist of quasi-cleavage fracture mixed a little shear fracture and the alloys′ tensile fracture mode after homogenizing is changed from intergranular fracture to transgranular fracture.
【Fund】: 湖南省科技重大专项计划项目(04GK1008-1);; 湖南省科技厅重点项目(03JKY1016)
【CateGory Index】: TG113
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