Phase equilibria in Nb-W-rich zone of the Nb-W-Si ternary system

被引：12
作者：
Ma, CL [1 ]
Tan, Y
Kasama, A
Hanada, S
机构：
[1] Japan Ultra High Temp Mat Res Inst, Ube, Yamaguchi 7550001, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi, Japan
来源：
MATERIALS TRANSACTIONS | 2002年 / 43卷 / 04期
关键词：
liquidus surface projection; isothermal section; phase equilibria; microstructure; phase diagram; niobium-tangsten-silicon ternary system;
D O I：
10.2320/matertrans.43.688
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper the solidification behavior and phase stability in Nb-W-Si alloys near the Nb-W binary are described. A partial liquidus surface projection of the Nb-W-Si system is constructed based on the observations of microstructure evolution during solidification, Microstructural and microchemical evidences prove the existence of the following eutectic and peritectic reactions: L --> beta(Nb. W)(5)Si-3 + Nb-ss: L + beta(Nb. W)(5)Si-3 --> (Nb(W))(3)Si: L --> (Nb(W))(3)Si + Nb-ss. One invariant point for reaction of L + beta(Nb. W)(5)Si-3 --> (Nb(W))(3)Si + Nb-ss is determined near composition Nb-16Di-3W. Moreover. phase stabilities at 1773 K in these allot S are briefly described h identifying the constituent phases after prolonged annealing treatment.
引用
收藏
页码：688 / 693
页数：6
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