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Abstract

Microstructures and magnetic properties in the aged hardened Fe-9AI-30Mn-x(C,Si) alloy, during overaging at 823 Kfor 48 h to 313 days, have been investigated by transmission electron microscopy, X-ray diffraction line profiles, and vibrating sample magnetometry. The results reveal that the precipitate k phase ((Fe,Mn)₃AIC) decomposition in this alloy, overaged at 823 k for one week, proceeded by two separate mechanisms; (a) wetting of the½α_o′<100> antiphase boundary segment of D0₃ ((Fe/Mn)₃Al) domains by B2 ((Fe/Mn)Al) phase, and (b) precipitation of B2 ((Fe/Mn)Al) structure within the domain. A similar superparamagnetic behaviour was discovered when the alloy was overaged at 823 K for 120-313 days. The super soft magnetic properties were mainly attributed toferromagnetic B2 ((Fe/Mn)Al) domains, D0₃, and ;α′-Mn phases.

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Structures and magnetic properties of overaged Fe-AI-Mn-C alloys

Abstract

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