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

被引：6

作者：

Cao, Pei-Shan ^{[1
]}

Wang, Hui ^{[1
]}

Ru, Yi ^{[1
]}

Liang, Yun-Fei ^{[1
]}

Gong, Sheng-Kai ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

来源：

RARE METALS | 2023年 / 42卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Ni-based single-crystal superalloy; Transmission electron microscopy; Stacking faults; Mo and Al addition; Creep rupture properties; MATRIX DISLOCATIONS; ELECTRON-MICROSCOPY; STACKING-FAULTS; NICKEL; BEHAVIOR; SHEAR; RU;

D O I：

10.1007/s12598-018-1094-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of Mo and Al addition on the microstructure as well as creep rupture properties at 760 degrees 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 into gamma ' precipitates, which can be explained by the increase in Orowan stress caused by the narrower gamma channel width and the decrease in stacking faults energy. Besides, 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.

引用

页码：3806 / 3813

页数：8

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