Microstructure and creep properties of Ni-based single-crystal superalloys with Mo/Al addition at 760℃/850 MPa

作     者：Pei-Shan Cao Hui Wang Yi Ru Yun-Fei Liang Sheng-Kai Gong Pei-Shan Cao;Hui Wang;Yi Ru;Yun-Fei Liang;Sheng-Kai Gong

作者机构：Key Laboratory of Aerospace Materials and Performance(Ministry of Education)School of Materials Science and EngineeringBeihang UniversityBeijing100191China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2023年第42卷第11期

页      面：3806-3813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：financially supported by the National Natural Science Foundation of China (No.51101004) 

主　　题：Ni-based single-crystal superalloy Transmission electron microscopy Stacking faults Mo and Al addition Creep rupture properties 

摘      要：The effect of Mo and Al addition on the microstructure as well as creep rupture properties at760.C/850 MPa was investigated by transmission electron microscopy(TEM)in a Ni-based single-crystal(SC)alloy with the composition of Ni-6.5Al-8.0Mo-2.4Cr-6.2Ta-4.9Co-1.5Re-(0.01-0.05)Y(wt%).The microstructure analysis shows that 0.5 wt%Al addition induces rapid decrease in creep rupture life,and this can be attributed to the formation of dense stacking faults cutting intoγ precipitates,which can be explained by the increase in Orowan stress caused by the narrowerγchannel width and the decrease in stacking faults ***,1.5 wt%Mo addition increases the anti-phase boundary energy and decreases the stacking faults energy,resulting in fewer stacking faults and thus a slight decrease in the creep rupture life.