DIRECTIONALLY SOLIDIFIED MICROSTRUCTURE OF AN ULTRA-HIGH TEMPERATURE Nb-Si-Ti-Hf-Cr-Al ALLOY

金属学报(英文版), 2004, 17(4): 450-454.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.College of Sciences, Northwestern Polytechnical University, Xi'an 710072, China

2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072,China

3.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072,China

4.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072,China

5.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072,China

6.Center for Cooperative Research, Toyama University, Toyama 930-8555, Japan

基金项目: 教育部博士基金(20020699025) 国家高技术研究发展计划(863计划)(2003AA305810) 国家自然科学基金(50271056)

DIRECTIONALLY SOLIDIFIED MICROSTRUCTURE OF AN ULTRA-HIGH TEMPERATURE Nb-Si-Ti-Hf-Cr-Al ALLOY

Keywords： ultra-high temperature alloy

The directionally solidified samples of an ultra-high temperature Nb-Si-Ti-Hf-Cr-Al alloy have been prepared with the use of an electron beam floating zone melting (EBFZM)furnace, and their microstructural characteristics have been analyzed. All the primary dendrites of Nb solid solution (Nbss), eutectic colonies of Nbss plus (Nb, Ti)3Si/(Nb,Ti)5Si3 and chains of (Nb, Ti)3Si/(Nb, Ti)5Si3 plates align along the growth direction of the samples. With increasing of the withdrawing rate, the microstructure is refined, and the amounts of Nbss+(Nb, Ti)3Si/(Nb, Ti)5Si3 eutectic colonies and (Nb, Ti)3Si/(Nb, Ti)5Si3 plates increase. There appear nodes in the (Nb, Ti)3Si/(Nb,Ti)5Si3 plates.

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DIRECTIONALLY SOLIDIFIED MICROSTRUCTURE OF AN ULTRA-HIGH TEMPERATURE Nb-Si-Ti-Hf-Cr-Al ALLOY

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