Al-10Si-xMg喷铸铝合金的组织及导热性能  

Microstructure and Thermal Conductivity of Al-10Si-xMg Alloys Prepared by Spray Ejection

作　　者：王剑 朱艳艳[1] 宁珍珍 WANG Jian;ZHU Yanyan;NING Zhenzhen(Science and Technology College of Hubei University of Arts and Science,Xiangyang 441800;Wuhan Uni-versity of Technology Xiangyang Demonstration Zone,Hubei Longzhong Laboratory,Xiangyang 441106)

机构地区：[1]湖北文理学院理工学院,襄阳441800 [2]武汉理工大学襄阳示范区,湖北隆中实验室,襄阳441106

出　　处：《特种铸造及有色合金》2024年第8期1108-1113,共6页Special Casting & Nonferrous Alloys

基　　金：湖北省教育厅科学研究计划项目(B2019391);湖北隆中实验室开放基金培育项目(2024KF-25)。

摘　　要：采用喷铸成形工艺制备Al-10Si-xMg合金,研究了Mg含量对铸态与T6态试样微结构、热导率与硬度的影响。结果表明,Mg元素促进铸态合金中α-Al基体球化,抑制枝晶形成,减少共晶Si相偏聚,进而显著提升T6态合金组织中共晶Si相分布的均匀性。共晶Si组织的优化减小电子散射,降低Mg固溶对电子散射的作用,使T6态Mg含量为0.4%(质量分数,下同)合金获得399.2 cm^(2)/(V∙s)的高电子迁移率,热导率为172.4 W/(m∙K),较Al-10Si合金降低约5.5%。同时,由于共晶Si与Mg2Si析出相的强化作用,合金的硬度显著增大,T6态Mg含量为0.4%合金的维氏硬度为1.13 GPa,较Al-10Si提升约126%。研究表明,适量Mg元素能够平衡Al-Si合金的导热与力学性能,从而获得良好的综合性能。Effects of Mg content on microstructure,thermal conductivity and hardness of as-cast and T6 heat-treated Al-10Si-xMg alloys prepared by spray ejection were investigated.The results indicate that Mg inhibits the formation of dendrites and promotes spheroidization forα-Al grains,and reduces the segregation of eutectic Si,distinctly improving homogeneity of eutectic Si phase in T6 heat-treated alloys.The optimization of eutectic Si can reduce electron scatter⁃ing and effect of Mg solution on electron scattering,leading to a high electron mobility of 399.2 cm^(2)/(V∙s)for the T6 alloys with Mg content of 0.4%,and thermal conductivity is 172.4 W/(m∙K),which is decreased by 5.5%compared to that of Al-10Si alloy.Meanwhile,the micro-hardness is significantly enhanced due to strengthening of eutectic Si and Mg2Si phase,and a large Vickers hardness of 1.13 GPa is achieved for T6-treated specimens with Mg content of 0.4%,which is increased by 126%compared to that of Al-10Si alloy.The results reveal that the thermal conduction and mechanical properties of Al-10Si-xMg alloys can be synergistically regulated by tailoring Mg content,resulting in excellent comprehensive performance.

关 键 词：AL-SI合金 喷铸 热导率 硬度 T6热处理 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]