稀土Y对Sr+B复合变质A356合金组织与性能的影响  

Effect of Rare Earth Yttrium on Microstructure and Properties of Sr+B Composite Modified A356 Alloy

作　　者：林灿鑫 程永奇[1,2] 潘育彤 鲁一田 谢泽源 洪瑞鑫 LIN Can-xin;CHENG Yong-qi;PAN Yu-tong;LU Yi-tian;XIE Ze-yuan;HONG Rui-xin(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Synergy Innovation Institute for Modern Industries,Guangdong University of Technology,Heyuan 517500,Guangdong,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]东源广工大现代协同创新研究院,广东河源517500

出　　处：《铸造》2023年第3期257-262,共6页Foundry

基　　金：揭阳市科技计划项目(2017xm066)。

摘　　要：在Sr+B复合变质A356合金的基础上加入稀土Y,通过光学显微镜及扫描电镜观察不同Y添加量对合金铸态显微组织形貌和尺寸的影响,并分析其力学性能和导热性能的变化规律。结果表明:稀土Y的添加不会影响Sr+B的变质效果且会使合金组织进一步细化,α-Al晶粒尺寸由未加Y变质时的62μm降低至44μm,二次枝晶臂间距从未变质时的12μm降低至9μm;A356铝合金中引入稀土Y会导致导热性能小幅度降低,但可以显著提升拉伸性能。当稀土Y添加量为0.4wt.%时,合金的综合性能最佳,热导率为158.8 W/(m·K),抗拉强度和伸长率分别为209.9 MPa和11.44%,与未加入稀土Y相比分别提升19.55%和167.29%。Yttrium was added into the composite modified A356 alloy based on Sr+B.The effects of different yttrium additions on the microstructure morphology and size of the alloy were observed by OM and SEM,and the changes of mechanical properties and thermal conductivity were analyzed.The results showed that the addition of the yttrium did not affect the modification effect of the Sr+B and further refined the microstructure of the alloy.Compared with the alloy without yttrium modification,the grain size of α-Al decreased from 62μm to 44μm,and that of SDAS decreased from 12μm to 9μm without modification.The introduction of the yttrium into A356 aluminum alloy led to the decrease of the thermal conductivity,but greatly improved the mechanical properties.When the addition of the yttrium was 0.4wt%,the comprehensive properties of the alloy were the best,the thermal conductivity was 158.8 W/(m·K),the tensile strength and elongation were 209.9 MPa and 11.44%,respectively,which were 19.55% and 167.29% higher than those without the addition of the yttrium.

关 键 词：A356 变质处理 稀土元素钇 拉伸性能 导热性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]