Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube

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	Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube
	Wang YR(王育人); Dong SY(董树勇); Wei BC(魏炳忱); Li WH(李维火)
刊名	Transactions of Nonferrous Metals Society of China
	2006
通讯作者邮箱	wangyr@imech.ac.cn
卷号	16 期号:Sp.Iss.2 页码:S89-S92
ISSN号	1003-6326
通讯作者	Wang, YR (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100080, Peoples R China.
中文摘要	Niobium-silicide alloys have great potential for high temperature turbine applications. The two-phase Nb/Nb5Si3 in situ composites exhibit a good balance in mechanical properties. Using the 52 in drop tube, the effect of undercooling and rapid solidification on the solidification process and micro-structural characterization of Nb-Si eutectic alloy was studied. The microstructures of the Nb-Si composites were investigated by optics microscope (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with X-ray energy dispersive spectrometry (EDS). Up to 480 K, deep undercooling of the Nb-Si eutectic samples was successfully obtained, which corresponds to 25% of the liquidus temperature. Contrasting to the conventional microstructure usually found in the Nb-Si eutectic alloy, the microstructure of the undercooled sample is divided into the fine and coarse regions. The most commonly observed microstructure is Nb+Nb5Si3, and the Nb3Si phase is not be found. The change of coarseness of microstructure is due to different cooling rates during and after recalescence. The large undercooling is sufficient to completely bypass the high temperature phase field.
学科主题	力学
类目[WOS]	Metallurgy & Metallurgical Engineering
研究领域[WOS]	Metallurgy & Metallurgical Engineering
收录类别	SCI
语种	英语
WOS记录号	WOS:000241774000019
公开日期	2007-06-15
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/17381]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wang YR,Dong SY,Wei BC,et al. Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube[J]. Transactions of Nonferrous Metals Society of China,2006,16(Sp.Iss.2):S89-S92.
APA	Wang YR,Dong SY,Wei BC,&Li WH.(2006).Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube.Transactions of Nonferrous Metals Society of China,16(Sp.Iss.2),S89-S92.
MLA	Wang YR,et al."Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube".Transactions of Nonferrous Metals Society of China 16.Sp.Iss.2(2006):S89-S92.