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Electron microscopic investigation of the aging of Fe−Ni−Al Alloys

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Aging with precipitation of (Ni, Fe) Al and Ni3Al occurs in the α-phase which has a martensitic structure and in the ferrite which has a structure close to the equilibrium structure. The state of the initial α-phase has an effect on hardening resulting from aging.

  2. 2.

    Hardening resulting from aging at 350–450°C is not accompanied by any visible change in the structure of the alloy. Only after aging at 500°C can one see areas (less than 20A in size) with an ordered (Ni, Fe) Al structure. This result leads us to conclude that these areas are also formed at lower temperature, but their size and number are probably much smaller. At temperatures above 500°C not only areas of the (Ni, Fe) Al phase are formed, but also large precipitates of Ni3Al. These precipitates do not play any significant role in the hardening of the α-phase resulting from aging.

  3. 3.

    The increase in hardness as the result of aging is due to the initial stage of the formation of areas with (Ni, Fe) Al structure which are coherent with the matrix. It is probable that it is the ordering of the structure which is responsible for the hardening of the alloy resulting from aging.

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Literature cited

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Authors
  1. V. M. Kardonskii
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  2. M. D. Perkas
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Additional information

Central Scientific Research Institute of Ferrous Metallurgy Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 15–19, November, 1964

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Kardonskii, V.M., Perkas, M.D. Electron microscopic investigation of the aging of Fe−Ni−Al Alloys. Met Sci Heat Treat 6, 672–675 (1964). https://doi.org/10.1007/BF00648715

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  • DOI: https://doi.org/10.1007/BF00648715

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