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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.4 (2002)  >  pp.688-693

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Phase Equilibria in Nb-W-rich Zone of the Nb-W-Si Ternary System

Chaoli Ma1), Yi Tan1), Aoki Kasama1) and Shuji Hanada2)
1) Japan Ultra-high Temperature Materials Research Institute
2) Institute for Materials Research, Tohoku University

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→β(Nb, W)5Si3+Nbss;L+β(Nb, W)5Si3→(Nb(W))3Si; L→(Nb(W))3Si+Nbss. One invariant point for reaction of L+β(Nb, W)5Si3→(Nb(W))3Si+Nbss is determined near composition Nb–16Si–3W. Moreover, phase stabilities at 1773 K in these alloys are briefly described by identifying the constituent phases after prolonged annealing treatment.

liquidus surface projection, isothermal section, phase equilibria, microstructure, phase diagram, niobium-tungsten-silicon ternary system

Received: October 16, 2001
Accepted: February 19, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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