热处理对含钇Al-Si-Fe/Al-20Si复合材料组织及性能的影响  

Effects of heat treatment on microstructure and properties of Al-Si-Fe/Al-20Si composites containing yttrium

作　　者：侯文胜[1] 陈刚[1] 孙广东[1] 赵玉涛[1] 余莹[1] 徐勇华[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《材料热处理学报》2013年第6期5-10,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(50971066;51174098);江苏省高校科研成果产业化推进工程项目(JH09-37);江苏省高校自然科学研究重大项目(10KJA430008);江苏省科技支撑项目(BE2012135);江苏省高校优势学科建设工程资助项目

摘　　要：以Al-20Si合金为基体,加入质量分数为2%的还原铁粉原位反应得到Al-Si-Fe/Al-20Si复合材料,研究了稀土Y含量为0.01%、0.1%、0.2%、0.3%对复合材料铸态和热处理后组织及性能的影响。结果表明:复合材料中的增强相为Al-Si-Fe金属间化合物,当Y含量为0.1%时对复合材料的变质效果最佳,富铁相成由细针状转变为鱼骨状且分布均匀,抗拉强度和伸长率与变质后基体相比分别提高了19.4%和20%,再经过550℃固溶处理和120℃时效处理后富铁相转变为短棒状或块状,与铸态相比抗拉强度和伸长率分别提高了8.4%和30%。A1-Si-Fe/A1-20Si composites were fabricated using Fe powder and A1-20Si alloy. The effects of addition of rare earth yttrium with contents of 0. 01% , 0.1% , 0. 2% , 0.3% on microstructure and properties of the as-cast and heat-treated composites were investigated. The results show that the strengthening phase in the composites is A1-Si-Fe intermctallic, adding 0. 1% rare earth Y can modify the as-cast miscrostructurc of the composites significantly and change the iron-rich phase from needle-like to herringbone shape. Meanwhile, the distribution of intermetallic particles becomes more homogeneous. The tensile strength and the elongation of the composites containing 1% Y increase by 19.4% and 20% than that of the modified matrix. After solution-treatment at 550 ℃ and aging at 120 ℃ , the iron-rich phases of the composites are further changed to short bar or block shape, and the tensile strength and the elongation of the composites increase by 8.4% and 30% than that of the as-cast.

关 键 词：AL-20SI 富铁相 热处理 稀土Y 

分 类 号：TB331[一般工业技术—材料科学与工程]