Effect of RE addition on solidification process and high-temperature strength of Al-12%Si-4%Cu-1.6%Mn heat-resistant alloy

作     者：Heng-cheng LIAO He-ting XU Yi-yun HU 廖恒成;许何婷;胡以云

作者机构：Jiangsu Key Laboratory for Advanced Metallic MaterialsSchool of Materials Science and Engineering Southeast University Nanjing 211189 China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2019年第29卷第6期

页      面：1117-1126页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(BM2007204)supported by the Jiangsu Key Laboratory of Advanced Metallic Materials,China Project(2242016K40011)supported by the Fundamental Research Funds for the Central Universities,China 

主　　题：Al-Si-Cu-Mn heat-resistant alloy rare earth solidification process high-temperature strength 

摘      要：The effect of RE addition on solidification process and high-temperature strength of Al-12%Si-4%Cu-1.6%Mn(in wt.%)heat-resistant alloy was investigated by microstructure observation and tensile test.A great number of fine needle-like RE-rich phases are observed in the alloys with RE addition. Solutionizing treatment does not change their morphologies and sizes, indicating that they have good thermal stability. The addition of RE totally alters the solidification process of eutectic CruAl2 phase, from network-like phase in the form of segregation at the final eutectic grain boundaries to discretely blocky phase growing on the hair-filamentous RE-rich needles. In the alloys with Ce addition, blocky CuAl2, particulate Al15Mn3Si2 and needle-like RE-rich needle phases grow together, but they did not occur in the alloy with only La addition. The addition of RE does not considerably improve the strength of the alloy at high temperatures. The formation of RE-rich phases also does not significantly alter the originating and propagating of micro-cracks in the alloy during tensile test.