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Carbon in hard magnetic alloys

  • Precision Steels and Alloys
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    With increasing carbon concentrations in Alnico alloys the effective number of conduction electrons increases, which increases the thermal stability of γ phase. A single-phase structure cannot be obtained with over 0.05% C.

  2. 2.

    The precipitation of strongly magnetic phase from the supercooled solid solution occurs at 620–880°. The presence of γ phase in the original structure, the amount of which increases with the carbon content of the alloy, inhibits the formation of high-coercivity structure, and impairs the magnetic properties.

  3. 3.

    With increasing amounts of carbon the temperature of the αγ→γ polymorphous transformation shifts to higher temperatures — from 480° with 0.005% C to 520° with 0.2% C.

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Authors
  1. V. M. Kuznetsov
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 49–51, February, 1977.

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Kuznetsov, V.M. Carbon in hard magnetic alloys. Met Sci Heat Treat 19, 133–136 (1977). https://doi.org/10.1007/BF00703159

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