The creep deformation mechanisms of a newly designed nickel-base superalloy

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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.
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2018-01-05
卷号	710 页码:309-317
关键词	Single-crystal Superalloy Superlattice Stacking-faults Low-stress Creep Gamma'-phase Intermediate Temperatures Dislocation-motion Behaviors Shearing Cmsx-4 Dependence
ISSN号	0921-5093
英文摘要	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.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [50931004, 51571196, 51771191]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79591]
专题	金属研究所_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.