Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy

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	Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy
	L. Shui ; T. Jin ; S. G. Tian ; Z. Q. Hu
刊名	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
	2007
卷号	454 页码:461-466
关键词	Ni-base single crystal superalloy tensile creep compression pre-treatment dislocation behavior
ISSN号	0921-5093
中文摘要	The influence of the gamma' precipitate morphology on the creep properties of [001]-orientated specimens of a nickel-base single crystal superalloy has been investigated. Specimens with two different gamma'microstructures, namely as-heat treated crystals with cuboidal gamma' particles and crystals given a compression pre-treatment to form a raft gamma' microstructure orientated parallel to the stress axis, were crept at 800 and 1000 degrees C. The analysis of the experiments show that, at 800 degrees C and 600 MPa, the alloy with cuboidal gamma' precipitates exhibited both lower creep rates and longer rupture lives compared to those with rafted gamma'. TEM examination showed that, in addition to {111} (110) -slip system operated in gamma matrix, the gamma' precipitates are cut by superlattice dislocations and stacking fault. It indicated that dislocations could shear the semi-coherent gamma' rafts relatively easily compared to the coherent cuboidal gamma'. At 1000 degrees C and 200MPa, the alloy with raft gamma' microstructure exhibited an extremely low minimum creep rate and longer rupture life. The dislocations movement by the combination of climbing and gliding processes and the glide-climb along gamma/gamma' vertical interfaces are impeded most strongly. This indicates that the rafted structure is beneficial to improving creep resistance of the alloy under the test condition. (c) 2006 Elsevier B.V. All rights reserved.
原文出处	://WOS:000245898500063
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/33807]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Shui,T. Jin,S. G. Tian,et al. Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2007,454:461-466.
APA	L. Shui,T. Jin,S. G. Tian,&Z. Q. Hu.(2007).Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,454,461-466.
MLA	L. Shui,et al."Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 454(2007):461-466.