Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of μ-Phase on Microstructural Change of W-Ni-Fe Heavy Alloys

W-Ni-Fe 중합금의 미세조직 변화에 대한 μ-phase의 영향

  • Kim, Dae-Geon (Division of Materials Science and Metallurgical Engineering, Hanyang University) ;
  • Kim, Eun-Pyo (Agency for Defense Development) ;
  • Kim, Yeong-Do (Division of Materials Science and Metallurgical Engineering, Hanyang University)
  • Published : 2002.01.01
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Abstract

In this study, the 95W heavy alloys of 3/7, 5/5 and 7/3 of Ni/Fe ratio were sintered at the temperature range between 1420 and $1480^{\circ}C$ for 1h and their microstructures were discussed for an effect of the ${\mu}$-phase $(Fe_7W_6)$ on the microstructure. The ${\mu}$-phase was observed in the only 95W-1.5Ni-3.5Fe alloy of 3/7 and it is thought to be formed and grown from the surface of the W particle. The W particle was surrounded with the ${\mu}$-phase and there were only the W particles and this phase without Ni-Fe-W matrix at the most part. The ${\mu}$-phase changed the interphase structure in the alloy and the grain growth of the W was suppressed because of interrupting the solution-reprecipitation of the W. The W content in the matrix was considered to be lowered due to the interruption of the solution-reprecipitation and the formation of the ${\mu}$-phase in the .

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References

  1. Euri-Pyo Kim. Ph. D. thesis. Hanyang. Univ. (1998)
  2. S.W.H. Yih. C.T. Wang. Tungsten. Plenum Press. New York. 413 (1979)
  3. R.M. German. Liquid Phase Sintering, Plenum Press. New York. 4 (1985)
  4. H.J. Ryu, S.H. Hong. W.H. Baek, J. Mat. Processing Tech., 63, 292 (1997) https://doi.org/10.1016/S0924-0136(96)02638-6
  5. B.C. Muddle, Met. Trans., 15A 1089 (1986) https://doi.org/10.1007/BF02644702
  6. J.R. Spencer. J.A. Mullendore. Tungsten and Tungsten Alloys, TMS edited by A. Bose. and R.J. Dewing, 111 (1992)
  7. S.G. Caldwell, Tungsten and Tungsten Alloys. TMS. edited by A. Bose. and R.J. Dewing, 89 (1992)
  8. A.F. Guillermet, L. Ostlund. Met. Trans., 17A 1809 (1986)
  9. E.T. Henig, H. Hofmann, G. Petzow, 10th Plansee Seminar 335 (1981)
  10. S.V.N. Naidu, A.M. Sriramamurthy, P.R. Rao, Binary Alloy Phase Diagrams. 2nd ed. Vol.3 edited by T.B. Massalski, etc. 2282-2283 (1990)
  11. S.V.N. Naidu, A.M. Sriramamurthy, P.R. Rao, Binary Alloy Phase Diagrams. 2nd ed. Vol.2 edited by T.B. Massalski, etc. 1791-1793 (1990)
  12. R.M. German. Sintering Theory and Practice, John Wiley & Sons, INC., New York 256 (1996)