Conclusions
In the W-Fe-Ni system subjected to annealing at 800 and 575°C, isostructural phases FeW and NiW form a continuous series of (Fe, Ni)W-type solid solutions.
At 800 and 575°C, the phases NiW2 and (Fe, Ni)W or a solid solution of nickel in the FeW phase are in equilibrium with the tungsten-based α-solid solution and (Ni, Fe)W or a solid solution of iron in the NiW phase exists in equilibrium with the NiW2 phase.
It is assumed that an invariant eutectoid equilibrium μ ⇆ α + γ + (Fe, Ni)W exists in the system under study at a temperature of approximately 1130°C (μ is the Fe7W6 phase; and α and γ are the tungsten and the nickel-based solid solutions).
Depending on the temperature, the phase composition of the binder present in the tungsten-based heavy alloys subjected to long-term annealing can undergo changes: at temperatures exceeding 1110°C, the binder consists of a nickel-based solid solution; in the 1100–1000°C range, an intermediate (Fe, Ni)W phase is present along with this phase; and at temperatures below 1000°C, it consists of the intermediate phases (Fe, Ni)W and NiW2.
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Translated from Poroshkovaya Metallurgiya, No. 8(344), pp. 61–67, August, 1991.
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Nikol'skii, A.V., Zakharov, A.M., Parshikov, V.G. et al. Phase equilibria in the tungsten-rich field of the W-Fe-Ni system in the 800–575°C. Powder Metall Met Ceram 30, 675–680 (1991). https://doi.org/10.1007/BF01172046
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DOI: https://doi.org/10.1007/BF01172046