The nucleation and growth mechanism of Ni-Sn eutectic in a single crystal superalloy

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	The nucleation and growth mechanism of Ni-Sn eutectic in a single crystal superalloy
	Jiang, Weiguo; Wang, Li; Li, Xiangwei; Lou, Langhong; Jiang, WG (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
	2017-12-01
发表期刊	ELSEVIER SCIENCE BV
ISSN	0022-0248
卷号	479 页码:75-82
摘要	The microstructure of single crystal superalloy with and without tin layer on the surface of as-cast and heat-treatment state was investigated by optical microscope (OM) and scanning electron microscopy (SEM). The composition of different regions on the surface was tested by energy dispersive X-ray (EDS). The reaction intermetallic compound (IMC) formed in the heat treatment process was confirmed by X-ray diffraction (XRD). The orientations of different microstructure in samples as heat treatment state were determined by electron back-scattering diffraction (EBSD) method. The porosity location in the interdendritic region was observed by X-ray computed tomography (XCT). The experiment results showed that the remained Sn on the surface of the superalloy reacted with Ni, and then formed Ni3Sn4 in the as-cast state. Sn enriched by diffusion along the porosity located in the interdendritic region and gamma + gamma' (contain a little of Sn) eutectic and Ni3Sn2 formed in single crystal superalloy during heat treatment, and the recalescence behaviors were found. Ni3Sn2 nucleated independently in the cooled liquid at the front of (gamma + gamma') (Sn) eutectic. The nucleation and growth mechanism of the eutectic and Ni3Sn2 IMC during heat treatment was discussed in the present paper. (C) 2017 Elsevier B.V. All rights reserved.; The microstructure of single crystal superalloy with and without tin layer on the surface of as-cast and heat-treatment state was investigated by optical microscope (OM) and scanning electron microscopy (SEM). The composition of different regions on the surface was tested by energy dispersive X-ray (EDS). The reaction intermetallic compound (IMC) formed in the heat treatment process was confirmed by X-ray diffraction (XRD). The orientations of different microstructure in samples as heat treatment state were determined by electron back-scattering diffraction (EBSD) method. The porosity location in the interdendritic region was observed by X-ray computed tomography (XCT). The experiment results showed that the remained Sn on the surface of the superalloy reacted with Ni, and then formed Ni3Sn4 in the as-cast state. Sn enriched by diffusion along the porosity located in the interdendritic region and gamma + gamma' (contain a little of Sn) eutectic and Ni3Sn2 formed in single crystal superalloy during heat treatment, and the recalescence behaviors were found. Ni3Sn2 nucleated independently in the cooled liquid at the front of (gamma + gamma') (Sn) eutectic. The nucleation and growth mechanism of the eutectic and Ni3Sn2 IMC during heat treatment was discussed in the present paper. (C) 2017 Elsevier B.V. All rights reserved.
部门归属	[jiang, weiguo ; wang, li ; li, xiangwei ; lou, langhong] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china
关键词	Crystal Structure Growth From Melt Solid Phase Epitaxy Alloys
学科领域	Crystallography ; Materials Science, Multidisciplinary ; Physics, Applied
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78965
专题	中国科学院金属研究所
通讯作者	Jiang, WG (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Jiang, Weiguo,Wang, Li,Li, Xiangwei,et al. The nucleation and growth mechanism of Ni-Sn eutectic in a single crystal superalloy[J]. ELSEVIER SCIENCE BV,2017,479:75-82.
APA	Jiang, Weiguo,Wang, Li,Li, Xiangwei,Lou, Langhong,&Jiang, WG .(2017).The nucleation and growth mechanism of Ni-Sn eutectic in a single crystal superalloy.ELSEVIER SCIENCE BV,479,75-82.
MLA	Jiang, Weiguo,et al."The nucleation and growth mechanism of Ni-Sn eutectic in a single crystal superalloy".ELSEVIER SCIENCE BV 479(2017):75-82.