Structural materials: metal-silicon-Boron. The Nb-rich corner of the Nb-Si-B system

被引：13
|
作者：
Katrych, S
Grytsiv, A
Bondar, A
Rogl, P
Velikanova, T
Bohn, M
机构：
[1] NASU, Frantsevich Inst Problems Mat Sci, UA-03680 Kiev, Ukraine
[2] Fed Inst Technol, Crystallog Lab, CH-8092 Zurich, Switzerland
[3] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria
[4] IFREMER, CNRS, UMR 6538, F-29263 Plouzane, France
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 02期
关键词：
niobium silicon boride; B-Nb-Si phase diagram; pseudobinary eutectic; ternary phase;
D O I：
10.1016/j.jssc.2003.02.008
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Phase equilibria in the Nb-Nb5Si3-NbB region were studied in the melting (crystallization) range by means of light microscopy, XRD, SEM and EMPA on alloys after arc-melting and annealing at 1800degreesC and at subsolidus temperatures. Phase transition and melting temperatures were determined by DTA and pyrometric Pirani-Alterthum technique resulting in a solidus projection and two isopleths, Nb77Si23-Nb77B23 and Nb99Si1-Nb5Si2B. The T-2-phase Nb5Si3-xBx (0 less than or equal to x less than or equal to 2, Cr5B3-type) was found to form equilibria with (Nb), NbB, Nb3Si, and with the T-1-phase (Mn5Si3 derivative type). The T2-phase melts incongruently (Nb5Si1.8B1.2 at 2245degreesC) and forms a quasibinary eutectic with the niobium solid solution on a minimum tie-line at similar to1880degreesC. (C) 2003 Elsevier Inc. All rights reserved.
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收藏
页码：493 / 497
页数：5
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