Sc和AlTiB在A356.2铝合金中的作用对比研究  

Comparative Study on Effects of Sc and AlTiB in A356.2 Aluminum Alloy

作　　者：闫洪 李和平 曹瑞珂 YAN Hong;LI He-ping;CAO Rui-ke(Material Research Institute of Kunming Metallurgical Research Institute Co.,Ltd.,Kunming 650031,Yunnan,China;Kunming Branch of Central Research Institute of Aluminum Corporation of China,Kunming 650031,Yunnan,China)

机构地区：[1]昆明冶金研究院有限公司,云南昆明650031 [2]中铝集团中央研究院昆明分院,云南昆明650031

出　　处：《铸造》2021年第11期1286-1289,共4页Foundry

基　　金：云南省社会发展科技计划-科研院所技术开发研究专项(2011CF009)

摘　　要：在A356.2铝合金中分别添加Sc和AlTiB,通过显微组织和力学性能的测试,研究它们在A356.2铝合金中的作用差别。试验结果表明:0.30%Sc+A356.2铝合金的共晶硅已转变成颗粒状,平均尺寸是2.85μm,合金的抗拉强度、伸长率、硬度分别是194.54 MPa、5.6%、HBW67。而1.0%AlTiB+A356.2铝合金的共晶硅是长针状和块状,平均尺寸为6.76μm,合金的抗拉强度、伸长率、硬度分别为158.73 MPa、3.6%、HBW58。通过0.30%Sc+A356.2铝合金和1.0%AlTiB+A356.2铝合金的对比试验得到,Sc在对共晶硅晶粒细化效果和提高铝合金的力学性能方面都超过AlTiB,而铝合金的力学性能与共晶硅的大小密切相关。The effects of Sc and AlTiB on A356.2 aluminum alloy were studied by testing microstructure and mechanical properties.The results show that the eutectic silicon of 0.30%Sc+A356.2 aluminum alloy has become granular,and the average size was 2.85μm.The tensile strength,elongation and hardness were 194.54 MPa,5.6%and HBW67,respectively.However,the eutectic silicon of 1,0%AlTiB+A356.2 aluminum alloy was long acicular and massive with an average size of 6.76μm.The tensile strength,elongation and hardness were 158.73 MPa,3.6%and HBW58,respectively.Through the comparative test of 0.30%Sc+A356.2 aluminum alloy and 1.0%AlTiB+A356.2 aluminum alloy,it is found that Sc is superior to AlTiB in refining eutectic silicon grains and improving mechanical properties of aluminum alloy,and the mechanical properties of aluminum alloy are closely related to the size of eutectic silicon.

关 键 词：SC ALTIB A356.2铝合金 共晶硅 力学性能 

分 类 号：TGI46.2[金属学及工艺]