Ageing Behavior of Mg-xAl-Zn with Variation of Al Content  

作　　者：Byoungho Kim Jongjin Jeon Yeongdo Park Yongho Park Ikmin Park 

机构地区：[1]Department of Materials Science and Engineering Pusan National University,30 Jangjeon-dong,Geumjeong-gu,Busan 609-735,Korea [2]Department of Advanced Materials Engineering Dong-Eui University,995 Eomgwangno,Jin-gu,Busan 614-714,Korea

出　　处：《Journal of Materials Science & Technology》2008年第1期51-53,共3页材料科学技术（英文版）

摘　　要：The ageing behavior of Mg-xAl-Zn alloys with a variation of AI contents （x=3,5,7,9 and 11 wt pct） were investigated.Solid solution treatment and artificial ageing were carried out at 693 and 493 K,respectively. After the solid solution treatment,β-Mg-（17）Al-（12） was resolved to theα-Mg matrix in the specimens which contained Al up to 9 wt pct and partially resolved in the specimen of 11 wt pct Al.During ageing,theβ- Mg-（17）Al-（12） phase was precipitated at the grain boundary in the form of discontinuous precipitation and grown into the matrix.The volume fraction ofβ-phase was increased with the Al contents.Tensile strength increased with the volume fraction of precipitatedβ-phase,which was believed to strengthen the matrix.The ageing behavior of Mg-xAl-Zn alloys with a variation of AI contents （x=3,5,7,9 and 11 wt pct） were investigated.Solid solution treatment and artificial ageing were carried out at 693 and 493 K,respectively. After the solid solution treatment,β-Mg-（17）Al-（12） was resolved to theα-Mg matrix in the specimens which contained Al up to 9 wt pct and partially resolved in the specimen of 11 wt pct Al.During ageing,theβ- Mg-（17）Al-（12） phase was precipitated at the grain boundary in the form of discontinuous precipitation and grown into the matrix.The volume fraction ofβ-phase was increased with the Al contents.Tensile strength increased with the volume fraction of precipitatedβ-phase,which was believed to strengthen the matrix.

关 键 词：Ageing Mg alloy Discontinuous precipitation 

分 类 号：TG166.4[金属学及工艺—热处理]