摘要
以往复挤压Mg-x Sn-1. 5Al-1Zn-1Si(x=3、5、8,质量分数,%)合金为研究对象,分析了合金的组织分布、力学性能和变形机制。结果表明:往复挤压合金的晶粒细小、组织均匀,随着Sn的增加,其均匀度呈现先升高后降低的趋势;往复挤压合金的强度和塑性较高,随着Sn含量的增加,合金强度和塑性呈现先增加后下降的趋势,Sn含量较高时,塑性明显下降;往复挤压过程中,Mg-xSn-1.5Al-1Zn-1Si合金更容易发生动态再结晶,位错攀移(滑移)成为变形的主要机制,位错密度呈现由增加到动态平衡再到下降的变化趋势。
The microstructure distribution,mechanical properties and deformation mechanism of Mg-xSn-1.5Al-1Zn-1Si( x = 3,5 and 8,mass fraction,%) reciprocating extrusion alloy were investigated. The results indicate that the reciprocating extrusion alloy has fine grain size and uniform structure,and the uniformity first increases and then decreases with the increase of Sn content. The strength and plasticity of the reciprocating extrusion alloy are relative high,and increase first then decrease with the increase of Sn content. When the Sn content is higher,the plasticity descends obviously. During extrusion process,dynamic recrystallization occurs quite easily in Mg-xSn-1.5Al-1Zn-1Si alloy,dislocation climb( or slip) becomes the main deformation mechanism,and dislocation density first increases to reach the dynamic equilibrium state,then decreases.
作者
高爱华
张建新
Gao Aihua;Zhang Jianxin(Institute of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China;Institute of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第1期134-137,共4页
Heat Treatment of Metals
基金
国家自然科学基金(51571086)
河南理工大学博士基金(B2016-09)
