摘要
在未变质Al-xMg_(2)Si合金中,随着Mg\Si含量从18wt.%降低到14wt.%,初生Mg_(2)Si晶粒尺寸发生明显细化,由~30μm减小到~10μm;当合金中Mg\Si的含量降低到12wt.%,初生Mg_(2)Si相完全消失,其金相组织为单一共晶相组成.对Al-xMg_(2)Si合金进行0.5wt.%Ca-Sb复合变质处理,当合金中Mg\Si的含量降低到10wt.%,合金中金相组织为初生α-Al+共晶Mg_(2)Si组成.在0.5wt.%Ca-Sb复合变质的Al-xMg_(2)Si合金中,由于变质剂的作用,在Al-xMg_(2)Si合金中,树枝晶状初生Mg_(2)Si消失,转变为细小的多边形,随着合金中Mg\Si含量从18wt.%降低到12wt.%,初生Mg_(2)Si晶粒尺寸从~15μm降低到~5μm,形成超细初生Mg_(2)Si晶体.对合金进行力学性能测试发现,超细初生Mg_(2)Si的形成对提高合金强度、硬度作用较大.
Al-xMg_(2)Si alloy was modified with 0.5wt.%Ca-Sb.With the decrease of Mg/Si content from 18 wt%to 14 wt%,the grain size of primary Mg_(2)Si in the unmodified alloy was refined from~123μm to~15μm,and the grain size of primary Mg_(2)Si in the unmodified alloy decreased from~123μm to~12μm When the content of Mg/Si in the alloy is reduced to 10 wt%,the microstructure of the alloy is composed of primaryα-Al+eutectic Mg_(2)Si.In Al-xMg_(2)Si alloy modified by 0.5wt.%CA sb,dendrite like primary Mg_(2)Si disappears and transforms into fine polygon due to the effect of modifier.With the decrease of Mg/Si content from 18 to 12wt.%,the grain size of primary Mg_(2)Si decreases from~15μm to~5μm,forming ultrafine primary Mg_(2)Si.The mechanical properties of the alloy were tested,and it was found that ultrafine primary Mg_(2)Si had a great effect on improving the mechanical properties of the alloy.The optimum alloy is Al-12Mg_(2)Si modified by 0.5wt.%Ca-Sb.
作者
陈思颖
陈瀹鑫
于宏辰
CHEN Siying;CHEN Yuexin;YU Hongchen(School of Water Conservancy and Environmental Engineering,Changchun Institute of Technology,Changchun 130021,China;School of Mechanical and Electrical Engineering,Changchun Institute of Technology,Changchun 130021,China)
出处
《吉林化工学院学报》
CAS
2021年第5期74-79,共6页
Journal of Jilin Institute of Chemical Technology
基金
吉林省教育厅项目(01130292019016,JJKH20200614KJ)
大学生创新创业计划项目(202011437019)
大学生创新创业计划项目(202011437052)。
