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Carbon in hard magnetic alloys


  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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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).

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  • Precipitation
  • Solid Solution
  • Thermal Stability
  • Magnetic Property
  • Carbon Content