Sb变质对Al-7Si-2Cu-Mg合金组织与力学性能的影响  

Effects of Sb Modification on Microstructure and Properties of Al-7Si-2Cu-Mg Alloy

作　　者：李钦 肖明 史秋月 曾大新 LI Qin;XIAO Ming;SHI Qiuyue;ZENG Daxin(Schools of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002)

机构地区：[1]湖北汽车工业学院材料科学与工程学院,十堰442002

出　　处：《特种铸造及有色合金》2025年第2期287-293,共7页Special Casting & Nonferrous Alloys

摘　　要：研究了Sb变质Al-7Si-2Cu-Mg合金的显微组织和力学性能,分析变质机制,并与Sr变质进行比较。结果表明,Sb变质使Al-7Si-2Cu-Mg合金中共晶Si由厚片状转变为细片状,热处理可以实现共晶Si球化,最适宜的Sb加入量为0.2%~0.3%;Sb提高Al-7Si-2Cu-Mg合金中初生α-Al析出温度、增加共晶再辉温度;Sb还降低Q-Al_(5)Cu_(2)Mg_(8)Si_(6)和θ-Al_(2)Cu相的析出温度,并减少其析出量。Sb变质明显提高Al-7Si-2Cu-Mg合金的力学性能,尤其是伸长率,铸态和T6处理后的伸长率都显著高于Sr变质合金。The microstructure and mechanical properties of Al-7Si-2Cu-Mg alloy modified with Sb were investigated and compared with those of Sr modified alloy,and the mechanism was also described.The results indicate that Sb addi⁃tion can transform eutectic Si in Al-7Si-2Cu-Mg alloy from coarse flake to fine lamellar,meanwhile the eutectic Si can be spheroidized by heat treatment,and the most suitable amount of Sb addition is 0.2%~0.3%.Sb can increase forma⁃tion temperature of primaryα-Al and recalescence magnitude.Sb also reduces precipitation temperature of QAl_(5)Cu_(2)Mg_(8)Si_(6) andθ-Al_(2)Cu,and decrease precipitation amount.The mechanical properties of Al-7Si-2Cu-Mg alloy can be obviously improved by Sb modification,especially the elongation.The elongation of as-cast and T6-treated alloy is significantly higher than that of Sr modified alloy.

关 键 词：Al-7Si-2Cu-Mg Sb变质 组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]