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The Superplasticity of Hard Magnetic Alloy Fe-23wt.%Co-30%Cr with Submicrocrystalline Structure
|Alexander Korznikov 1, Zbigniew Pakieła 2, Galia F. Korznikova 1, Krzysztof J. Kurzydlowski 2
1. Institute for Metals Superplsticity Problems, Russian Academy of Sciences, Ufa, Russian Federation
Fe-23wt.%Co-30%Cr alloy is a precipitation hardening alloy used industrially as a hard magnetic material. Magnets are usually produced from this alloy by casting, as mechanical deformation and machining are hampered by the presence of brittle intermetallic σ phase in the temperature range 700-1050oC. However it is known, that variation of the size and morphology of intermetallic phases in commercial alloys enhances plasticity. Previously it was reported, that severe plastic deformation at room temperature of Fe-23wt.%Co-30%Cr alloy by high-pressure torsion results in a partial transformation of the initial phases and the formation of a nanocrystalline structure. The nanocrystalline samples exhibited increased strength and plasticity in comparison with coarse grained samples. The drawback of the samples processed by means of high-pressure torsion is their small thickness (less than 1 mm) whereas deformation at elevated temperatures in superplastic conditions enables to produce massive samples.
Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Alexander Korznikov
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-05-07 16:08 Revised: 2009-06-08 12:55