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

作     者：P.Guan X.P.Guo X.Ding J.Zhang L.M.Gao K. Kusabiraki 

作者机构：College of Sciences Northwestern Polytechnical University Xi'an 710072 ChinaState Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072ChinaState Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072ChinaState Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072ChinaState Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072ChinaCenter for Cooperative Research Toyama University Toyama 930-8555 Japan 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2004年第17卷第4期

页      面：450-454页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(No.50271056) National High Technical Research and Development Programme of China(No.2003AA305810) the Special Research Fund for Doctoral Disciplines in Colleges and Universities of M.0.E,China(No.20020699025) 

主　　题：ultra-high temperature alloy Nb-Si based alloy in situ composite unidirectional solidification microstructural evolution 

摘      要：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 Nba, plus (Nb, Ti)3 Si/(Nb, Ti)5 Si3 and chains of (Nb, Ti)3 Si/(Nb, Ti)5 Si3 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)3 Si/(Nb, Ti)5 Si3 eutectic colonies and (Nb, Ti)3 Si/(Nb, Ti)5 Si3 plates increase. There appear nodes in the (Nb, Ti)3 Si/(Nb, Ti)5 Si3 plates.