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The creep deformation mechanisms of a newly designed nickel-base superalloy
Cui, LQ; Yu, JJ; Liu, JL; Jin, T; Sun, XF; Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-01-05
发表期刊MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
卷号710页码:309-317
摘要The influences of applied stress (120-760 MPa) and temperature (700-1000 degrees C) on the creep deformation mechanisms of the newly developed nickel-base superalloy M951G have been studied. The dominant deformation mechanisms of M951G alloy after different creep tests were systematically investigated and the reasons for their transition were well discussed. A creep mechanism map at various creep conditions was summarized and the theoretical critical resolved shear stresses (CRSSs) of various creep mechanisms under different temperatures were also calculated. Results show that the CRSSs of different creep mechanisms display different dependencies of temperature and the favorable deformation mechanisms at different creep conditions are different. tau(ApB), tau(OB) and tau(CL) are decreased to varying degrees with the temperature increasing; on the contrary, there is a positive correlation between tau(SF) and temperature. At low temperature region, the favorable deformation mechanism is shearing of gamma' precipitates by stacking faults. However, it changes to antiphase boundaries (APBs) coupled dislocation pairs shearing in the gamma' precipitates and dislocation climbing in the gamma matrix channel at high temperatures. At intermediate temperatures, both stacking faults and APBs are observed owing to the alternate leading of the CRSSs for APBs and stacking faults shearing in gamma' precipitates.; The influences of applied stress (120-760 MPa) and temperature (700-1000 degrees C) on the creep deformation mechanisms of the newly developed nickel-base superalloy M951G have been studied. The dominant deformation mechanisms of M951G alloy after different creep tests were systematically investigated and the reasons for their transition were well discussed. A creep mechanism map at various creep conditions was summarized and the theoretical critical resolved shear stresses (CRSSs) of various creep mechanisms under different temperatures were also calculated. Results show that the CRSSs of different creep mechanisms display different dependencies of temperature and the favorable deformation mechanisms at different creep conditions are different. tau(ApB), tau(OB) and tau(CL) are decreased to varying degrees with the temperature increasing; on the contrary, there is a positive correlation between tau(SF) and temperature. At low temperature region, the favorable deformation mechanism is shearing of gamma' precipitates by stacking faults. However, it changes to antiphase boundaries (APBs) coupled dislocation pairs shearing in the gamma' precipitates and dislocation climbing in the gamma matrix channel at high temperatures. At intermediate temperatures, both stacking faults and APBs are observed owing to the alternate leading of the CRSSs for APBs and stacking faults shearing in gamma' precipitates.
部门归属[cui, luqing ; yu, jinjiang ; liu, jinlai ; jin, tao ; sun, xiaofeng] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [cui, luqing] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china
关键词Single-crystal Superalloy Superlattice Stacking-faults Low-stress Creep Gamma'-phase Intermediate Temperatures Dislocation-motion Behaviors Shearing Cmsx-4 Dependence
学科领域Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China [50931004, 51571196, 51771191]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79591
专题中国科学院金属研究所
通讯作者Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Cui, LQ,Yu, JJ,Liu, JL,et al. The creep deformation mechanisms of a newly designed nickel-base superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,710:309-317.
APA Cui, LQ,Yu, JJ,Liu, JL,Jin, T,Sun, XF,&Yu, JJ .(2018).The creep deformation mechanisms of a newly designed nickel-base superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,710,309-317.
MLA Cui, LQ,et al."The creep deformation mechanisms of a newly designed nickel-base superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 710(2018):309-317.
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