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Title:
Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube
Author: Wang YR(王育人); Dong SY; Wei BC(魏炳忱); Li WH(李维火)
Issued Date: 2005-10-09
Conference Name: 6th International Workshop on Advanced Intermetallic and Metallic Materials, OCT 09-15, 2005, Yangzhou, PEOPLES R CHINA
Abstract: 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.
Indexed Type: CPCI-S
Subject: 力学
Corresponding Author: 王育人
Source: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2006,16(suppl.2):S89-S92
Language: 英语
WOS ID: WOS:000241774000019
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Content Type: 会议论文
URI: http://dspace.imech.ac.cn/handle/311007/13763
Appears in Collections:力学所知识产出(1956-2008)_会议论文

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Recommended Citation:
Wang YR,Dong SY,Wei BC,et al. Undercooling and Rapid Solidification of Nb-Si Eutectic Alloys Studied by Long Drop Tube[C]. 见:6th International Workshop on Advanced Intermetallic and Metallic Materials, OCT 09-15, 2005, Yangzhou, PEOPLES R CHINA
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