摘要
含有强化相Mg2Si的镁合金,是一种可望在汽车发动机和传动零部件应用的低成本耐热镁合金.汉字状的 Mg2Si颗粒相的细化是这种合金能够进一步应用到砂铸和金属型铸造的关键.本文重点研究了合金元素Sb对Mg2Si颗粒相及其基体组织的细化效果及其细化机制.结果表明:Sb的加入,通过合成异质晶核核心,促进了细小弥散分布的Mg2Si颗粒的形成;此外,Sb的加入,同时也进一步细化了基体组织;显微组织的改善导致了合金室温及其高温（150℃）下机械性能的提高.
Magnesium alloys containing Mg2Si particles, as a promising cheap heat-resistant magnesium alloy for automobile engine applications, are attracting more and more attention of both material scientists and design engineers. Refinement of the Chinese script Mg2Si particle is a key for using this alloy in sand casting or permanent mould casting. The refinement effect of antimony (Sb) on the microstructure was investigated. It shows Sb addition promotes the formation of fine polygonal type Mg2Si particles by providing the nucleation sites. Moreover, the grain sizes of Sb modified Mg-Al-Zn-Si alloy is much finer than that of base alloy. The improved microstructure of the modified alloy results in the large improvement in toughness and tensile properties at both ambient and elevated temperature of 150 degreesC as compared to the base alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第10期1105-1108,共4页
Acta Metallurgica Sinica
基金
国家863高技术研究发展计划2001AA331030
中国博士后科学基金资助项目
