Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy

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	Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy
	E. D. Wu; G. A. Sun; B. Chen; J. Zhang; V. Ji; V. Klosek; M. H. Mathon
	2014
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	45A 期号:1 页码:139-146
摘要	A single crystal superalloy with initial sample axis 10 deg deviated from [001] was creep deformed at 1273 K (1000 degrees C) 235 MPa and its triaxial strain/stress state and subgrain defects were studied by neutron diffraction. Normal internal stresses with their directions close to the loading axis and their scales smaller than those perpendicular to the axis were observed and attributed to a lattice rotation toward [001] pole. The internal stress at a level approaching to the loading stress and mostly in the state of interphase stress was induced during the first stage of creep prior to rafting and associated to lattice rotation, microstrain relaxation and line-up of misoriented gamma'-precipitates. The internal stress was diminished and released at final stage of creep associated with a reduction in unit-cell volume and a transition of strain/stress state between the two phases. The observation was explained by development of dislocations and raft structure during creep. (C) The Minerals, Metals & Materials Society and ASM International 2013
部门归属	[wu, erdong ; zhang, jian] inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china. [sun, guangai ; chen, bo] inst nucl phys & chem, mianyang 621900, peoples r china. [ji, vincent] univ paris 11, lemhe icmmo, umr 8182, f-91405 orsay, france. [klosek, vincent ; mathon, marie-helene] cea saclay, lab leon brillouin, f-91191 gif sur yvette, france. ; wu, ed (reprint author), inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; ewu@imr.ac.cn
关键词	Nickel-base Superalloy X-ray-diffraction Lattice-parameter Mismatch High-volume Fraction Internal-stresses In-situ Temperature-dependence Residual-stresses Deformation Microstructure
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72588
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	E. D. Wu,G. A. Sun,B. Chen,et al. Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2014,45A(1):139-146.
APA	E. D. Wu.,G. A. Sun.,B. Chen.,J. Zhang.,V. Ji.,...&M. H. Mathon.(2014).Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,45A(1),139-146.
MLA	E. D. Wu,et al."Neutron Diffraction Study of Strain/Stress States and Subgrain Defects in a Creep-Deformed, Single-Crystal Superalloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 45A.1(2014):139-146.