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High Strength FeCo–V Intermetallic Alloy: Electrical and Magnetic Properties

Published online by Cambridge University Press:  01 June 2005

R.S. Sundar ,
S.C. Deevi  and
B.V. Reddy
R.S. Sundar
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
S.C. Deevi*
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
B.V. Reddy
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
*
a) Address all correspondence to this author. Present address: RD&E, Philip Morris USA, Richmond, VA 23261-6583 e-mail: Seetharama.c.deevi@pmusa.com This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/jmr/policy.html.
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Abstract

Age-hardening behavior of a new generation of FeCo alloys [Fe–40Co–5V–0.005B–0.015C–0.5Mo–0.5Nb (at.%)] is characterized by microhardness, tensile testing, electrical resistivity, and magnetic properties. The alloy exhibits maximum hardening when aged at 600 °C. Precipitation of γ2 (V-rich face-centered cubic phase) during aging appears to be responsible for the observed hardening behavior. The alloy exhibits superior creep resistance when subjected to solutionizing in γ phase field and aged at 600 °C. On the other hand, the room temperature tensile ductility of the aged alloy depends on the grain size, which in turn can be controlled by varying the solutionizing condition. The age-hardened alloy exhibits a room temperature electrical resistivity of 70–75 μΩ cm. The higher resistivity of the present alloy as opposed to the commercial FeCo–2V alloys is attributed to the high V content of the alloy. Structure-sensitive magnetic properties like coercivity and core losses of the alloy are affected by the aging treatment, and the maximum coercivity is observed when the alloy is aged at 600 °C. High coercivity of the alloy is attributed to the fine distribution of paramagnetic γ2 precipitate, fine grain size, and internal stress arising from phase transformation.

Keywords

AlloyElectrical propertiesMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1515 - 1522
Copyright
Copyright © Materials Research Society 2005

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