Directional coarsening of gamma ' phase in single crystal nickel based superalloys during tensile creep

IMR OpenIR

	Directional coarsening of gamma ' phase in single crystal nickel based superalloys during tensile creep
	S. G. Tian; H. H. Zhou; J. H. Zhang; H. C. Yang; Y. B. Xu; Z. Q. Hu
	2000
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	16 期号:4 页码:451-456
摘要	The gamma' precipitate rafting kinetics and morphological evolution for two model single crystal superalloys have been studied. The microstructure of the alloys after different stages of tensile creep at 1040 degrees C and under a range of stresses are examined using TEM and SEM, The chemical compositions of both gamma and gamma' phases are analysed by energy dispersive spectrometry. Results show that a meshlike gamma' raft structure is formed along the direction normal to the stress axis during primary creep. The applied stress causes a decrease in the coherent strain energy at the gamma'/gamma interfaces in the (001) crystal plane. The released energy is the driving force for the diffusion of elements, leading to the formation of the gamma' rafts. A longer time is required for the formation of gamma' rafts in alloy 2 owing to its higher content of the refractory element W which obstructs the migration of the other elements in the diffusion field of the gamma' rafts.
部门归属	shenyang polytech univ, shenyang 110023, peoples r china. chinese acad sci, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china. northeastern univ, shenyang 110006, peoples r china.;tian, sg (reprint author), shenyang polytech univ, shenyang 110023, peoples r china
关键词	Super-alloy Uniaxial Stress Shape Changes Parameters Morphology Apparent
URL	查看原文
WOS记录号	WOS:000086650000013
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37175
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. G. Tian,H. H. Zhou,J. H. Zhang,et al. Directional coarsening of gamma ' phase in single crystal nickel based superalloys during tensile creep[J]. Materials Science and Technology,2000,16(4):451-456.
APA	S. G. Tian,H. H. Zhou,J. H. Zhang,H. C. Yang,Y. B. Xu,&Z. Q. Hu.(2000).Directional coarsening of gamma ' phase in single crystal nickel based superalloys during tensile creep.Materials Science and Technology,16(4),451-456.
MLA	S. G. Tian,et al."Directional coarsening of gamma ' phase in single crystal nickel based superalloys during tensile creep".Materials Science and Technology 16.4(2000):451-456.