Evolution and analysis of gamma ' rafting during creep of single crystal nickel base superalloy

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	Evolution and analysis of gamma ' rafting during creep of single crystal nickel base superalloy
	S. G. Tian; C. R. Chen; J. H. Zhang; H. C. Yang; X. Wu; Y. B. Xu; Z. Q. Hu
	2001
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	17 期号:6 页码:736-744
摘要	By means of TEM observation and finite element analysis, an investigation has been made into the directional coarsening of the gamma' phase for a single crystal nickel base superalloy with [001] orientation during creep at 1040 degreesC, The results show that the strain energy change related to the elastic strain is to be the driving farce for gamma' rafting, The extruded strain of the lattice in the cuboidal gamma' interfaces results in a supersaturation of the elements Ta and Al of larger atomic radius. The extrusion or expansion strain in the lattice of the cuboidal gamma' planes may repel or trap these atoms to promote the directional growth of the gamma' phase into a needle-like raft structure along the direction parallel to the stress axis under an applied compression stress, or into a meshlke raft structure along the direction perpendicular to stress axis under applied tensile stress. The normal direction of the expanding lattice is supposed to be the one in which the gamma' rafts grow. The rate of gamma' rafting is enhanced by increasing viscoplastic flow in the gamma matrix and elastic strain in the gamma' phase. Therefore, there is a small er rate of growth under compressive than under tensile stress as a result of the smaller expansion strain and viscoplastic flow occurring in the former. MST/4476.
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. wayne state univ, dept mech engn, detroit, mi 48202 usa.;tian, sg (reprint author), shenyang polytech univ, shenyang 110023, peoples r china
关键词	High-temperature Creep High-volume Fraction Driving-force Uniaxial Stress Shape Changes Microstructure Morphology Alloy
URL	查看原文
WOS记录号	WOS:000169740200018
引用统计	被引频次：28[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/321006/36817
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. G. Tian,C. R. Chen,J. H. Zhang,et al. Evolution and analysis of gamma ' rafting during creep of single crystal nickel base superalloy[J]. Materials Science and Technology,2001,17(6):736-744.
APA	S. G. Tian.,C. R. Chen.,J. H. Zhang.,H. C. Yang.,X. Wu.,...&Z. Q. Hu.(2001).Evolution and analysis of gamma ' rafting during creep of single crystal nickel base superalloy.Materials Science and Technology,17(6),736-744.
MLA	S. G. Tian,et al."Evolution and analysis of gamma ' rafting during creep of single crystal nickel base superalloy".Materials Science and Technology 17.6(2001):736-744.