机械端盖用新型铝合金的铸造性能研究  

Study on Casting Properties of New Aluminum Alloy for Mechanical End Cover

作　　者：马丽[1] 要玉宏[2] MA Li;YAO Yuhong(School of Aeronautical Materials Engineering,Xi'an Aviation Vocational and Technical College,Xian 710089,China;School of Materials and Chemical Engineering,Xian University of Technology,Xi'an 710021,China)

机构地区：[1]西安航空职业技术学院航空材料工程学院,陕西西安710089 [2]西安工业大学材料与化工学院,陕西西安710021

出　　处：《热加工工艺》2023年第3期72-74,78,共4页Hot Working Technology

基　　金：陕西省教育厅重点实验室项目(14JS031)。

摘　　要：为了研究机械端盖用含钪新型铝合金的铸造性能,进行了不同钪含量(质量分数,%)铝合金Al-7Si-0.3Mgx Sc(x=0,0.1,0.3,0.5)的显微组织与铸造性能测试与分析。结果表明:随钪含量增加,合金内部组织先细化后粗化,铸造性能先提高后下降。铝合金Al-7Si-0.3Mg-x Sc的钪含量优选为0.3%。与不添加钪合金相比,Al-7Si-0.3Mg-0.3Sc合金的铝液流程长度测试值增幅达12.1%,裂纹长度测试值减幅达22.4%,合金流动性和抗热裂性得到明显提高,合金铸造性能得到显著改善。In order to study the casting properties of a new aluminum alloy containing scandium for mechanical end cap,the microstructure and casting properties of the aluminum alloy Al-7Si-0.3Mg-x Sc(x=0,0.1,0.3,0.5) with different scandium contents were tested and analyzed. The results show that with the increase of scandium content, the internal structure of the alloy is refined first and then coarsened, and the casting properties are improved first and then decreased. The scandium content of the aluminum alloy Al-7Si-0.3Mg-x Sc is preferably 0.3%. Compared with those of the alloy without scandium, the test value of aluminum liquid flow length of Al-7Si-0.3Mg-0.3Sc alloy increases by 12.1%, and the measured value of crack length decreases by 22.4%. The fluidity and hot crack resistance of the alloy are significantly improved, and the casting properties of the alloy are significantly improved.

关 键 词：铸造性能 Al-7Si-0.3Mg-xSc合金 流动性 抗热裂性 显微组织 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]