Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy

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	Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy
	H. T. Li; J. T. Guo; K. W. Huai; H. Q. Ye
	2006
发表期刊	Journal of Crystal Growth
ISSN	0022-0248
卷号	290 期号:1 页码:258-265
摘要	The microstructure and room temperature compressive deformation behavior of a rapidly solidified NiAl-Cr(Mo)-Dy eutectic alloy fabricated by water-cooled copper mold method were studied by a combination of SEM, EDS and compressive tests. The morphology stability after hot isostatic pressing (HIP) treatment was evaluated. Rapid solidification resulted in a shift in the coupled zone for the eutectic growth towards the Cr(Mo) phase, indicating a hypoeutectic composition, hence increasing the volume fraction of primary dendritic NiAl. Meanwhile, significantly refined microstructure and lamellar/rod-like Cr(Mo) transition were observed due to trace rare earth (RE) element Dy addition and rapid solidification effects. Compared with the results in literature [H.E. Cline, J.L. Walter, Metall. Trans. 1(1970)2907-2917; P. Ferrandini, W.W. Batista, R. Caram, J. Alloys Comp. 381(2004)91-98], an interesting phenomenon, viz., NiAl halos around the primary Cr(Mo) dendrites in solidified NiAl-Cr(Mo) hypereutectic alloy, was not observed in this study. This difference was interpreted in terms of their different reciprocal nucleation ability. In addition, it was proposed that the localized destabilization of morphology after HIP treatment is closely related to the presence of primary NiAl dendrites. The improved mechanical properties can be attributed to the synergistic effects of rapid solidification and Dy addition, which included refined microstructure, suppression of the crack development along eutectic grain boundaries, enhancement of density of geometrically necessary dislocations located at NiAl/Cr(Mo) interfaces and the Cr solubility extension in NiAl. (c) 2006 Published by Elsevier B.V.
部门归属	chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;li, ht (reprint author), chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china;htli@imr.ac.cn
关键词	Lamellar/rod-like Transition Morphological Stability Nucleation Solubility Rapid Solidification Rod-plate Transition Mechanical-properties Electronic-structure Growth-rate Cr Alloys Toughness Chromium Strength Nucleation Interface
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WOS记录号	WOS:000236656600045
引用统计	被引频次：35[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/321006/34300
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. T. Li,J. T. Guo,K. W. Huai,et al. Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy[J]. Journal of Crystal Growth,2006,290(1):258-265.
APA	H. T. Li,J. T. Guo,K. W. Huai,&H. Q. Ye.(2006).Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy.Journal of Crystal Growth,290(1),258-265.
MLA	H. T. Li,et al."Microstructure characterization and room temperature deformation of a rapidly solidified NiAl-based eutectic alloy containing trace Dy".Journal of Crystal Growth 290.1(2006):258-265.