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Interdiffusional effects between tungsten fibers and an iron-nickel-base alloy

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Abstract

Tungsten fibers in the INCOLOY* 903 alloy were annealed for over 100 hours at 1038 °C and 1200 °C. It was found that interdiffusion results in the formation of a reaction zone. SEM-EDS probe analysis showed that the chemistries across this zone were constant, suggesting the zone was a compound phase. The composition of the compound was estimated to be that of a μ-type phase. The local chemistry (in atomic percent) at the reaction zone/alloy matrix interface was found to be approximately 8 pct W, 1.2 pct Nb, 40 pct Fe, 14 pct Co, and 36 pct Ni. In addition, recrystallization was observed in both the remaining tungsten fiber and the nearby INCOLOY 903 matrix after annealing at 1200 °C, but not at 1038 °C. The results of this study suggest that reaction zone growth kinetics can be minimized by the reduction of Co and Fe and the increase of W in the matrix alloy.

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Authors and Affiliations

  1. Henry Krumb School of Mines, Columbia University, 10027, New York, NY

    T. Caulfield (Graduate Research Assistant), R. S. Bellows (Graduate Research Assistant) & J. K. Tien (Henry Marion Howe Professor of Metallurgy and Director of the Center for Strategic Materials)

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  1. T. Caulfield
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  2. R. S. Bellows
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  3. J. K. Tien
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Caulfield, T., Bellows, R.S. & Tien, J.K. Interdiffusional effects between tungsten fibers and an iron-nickel-base alloy. Metall Trans A 16, 1961–1968 (1985). https://doi.org/10.1007/BF02662397

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  • DOI: https://doi.org/10.1007/BF02662397

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