Metal Science and Heat Treatment

, Volume 30, Issue 10, pp 795–799 | Cite as

Effect of the chemical composition on the structure and mechanical properties of alloys of the system Mn−Al−C in the magnetic region

  • O. A. Kaibyshev
  • R. Z. Valiev
  • A. Kh. Nurislamov
  • V. V. Stolyarov
Technical Information

Conclusions

  1. 1.

    An increase of the manganese content of alloys of the system Mn−Al−C from 68.9 to 73.5% increases the stability of the high-temperature ε-phase, and as a result of cooling in air from the homogenization temperature the ε-phase becomes fixed in the structure.

     
  2. 2.

    An increase of the manganese content of alloys of the system Mn−Al−C also lowers the temperatures of the beginning and end of the ε→τ-transformation and at the same time broadens its temperature interval.

     
  3. 3.

    Enrichment of alloys of the system Mn−Al−C with aluminum or manganese relative to the optimal composition leads to the appearance of excess nonmagnetic η- and β-phases, respectively, and these lower the level of magnetization; in addition to that, in the alloy with 73.5% Mn thermal stability is impaired as a result of disintegration of the ferromagnetic phase.

     
  4. 4.

    A small amount of η-phase (up to 15%) lowers the deformability of the alloy, which manifests itself in higher yield stresses and lower ductility, but when the alloy contains the same amount of β-phase, it leads to a considerable lowering of the yield stress.

     

Keywords

Aluminum Mechanical Property Manganese Thermal Stability Ductility 

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Literature cited

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • O. A. Kaibyshev
  • R. Z. Valiev
  • A. Kh. Nurislamov
  • V. V. Stolyarov

There are no affiliations available

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