Creep anisotropy dominated by orientation rotation in Ni-based single crystal superalloys at 750 °C/750 MPa

被引：17
作者：
Qu, Pengfei [1 ]
Yang, Wenchao [1 ]
Liu, Chen [1 ]
Qin, Jiarun [1 ]
Wang, Qiang [1 ]
Zhang, Jun [1 ]
Liu, Lin [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2024年 / 186卷
基金：
中国国家自然科学基金;
关键词：
Ni-based single crystal superalloys; Creep; Anisotropy; Orientation rotation; STRESS RUPTURE PROPERTIES; STACKING-FAULT; INTERMEDIATE TEMPERATURES; DEFORMATION MECHANISMS; MATRIX DISLOCATIONS; GAMMA'-PHASE; CMSX-4; MICROSTRUCTURE; SHEARING; SLIP;
D O I：
10.1016/j.jmst.2023.10.055
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The creep anisotropy of Ni-based single crystal superalloys was studied at 750 degrees C/750 MPa. Transmission electron microscopy (TEM) observations showed that stacking faults and micro-twins were the typical dislocation configurations, which all originated from the activity of {1111 ( 112 ) slip systems. Then, the orientation rotation caused by the activity of the main {1111 ( 112 ) slip system would accelerate the specimen fracturing in shear fracture mode. Furthermore, the orientation rotation would dominate the creep anisotropy. The orientation rotation would occur during the entire creep process, the greater the degree of rotation, the more severe the asynchrony of rotation, which would result in nonuniform deformation and local stress concentration, and exacerbate the failure of the specimen. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：91 / 103
页数：13
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