Studies on the bulk nanocrystalline Ni–Fe–Co alloy prepared by mechanical alloying–sintering–hot rolling route

Nanocrystalline Ni–Fe alloys have emerged as a promising soft magnetic material for high frequency applications where low hysteresis loss is the prime requirement. Nanocrystalline 80Ni–20Fe (wt.%) alloys synthesized by mechanical alloying have shown improved magnetic properties as compared to conven...

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Veröffentlicht in:Journal of alloys and compounds 2009-05, Vol.476 (1), p.311-317
Hauptverfasser: Vajpai, S.K., Mahesh, B.V., Dube, R.K.
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container_title Journal of alloys and compounds
container_volume 476
creator Vajpai, S.K.
Mahesh, B.V.
Dube, R.K.
description Nanocrystalline Ni–Fe alloys have emerged as a promising soft magnetic material for high frequency applications where low hysteresis loss is the prime requirement. Nanocrystalline 80Ni–20Fe (wt.%) alloys synthesized by mechanical alloying have shown improved magnetic properties as compared to conventional 80Ni Permalloy due to formation of nanocrystalline Ni 3Fe as major phase during mechanical alloying. However, retaining nanocrystallinity during consolidation to prepare bulk material is a key issue. The present paper describes preparation of bulk nanocrystalline 80Ni–15Fe–5Co (wt.%) alloy by a powder metallurgy route involving mechanical alloying of elemental powder mixture followed by sintering and hot rolling. The average grain size of the mechanically alloyed powder was approximately 10 nm after milling for 46 h. A multi-step sintering–hot rolling route was developed to prepare a crack-free strip having an average grain size 32 ± 2 nm and 99% theoretical density. The bulk nanocrystalline 80Ni–15Fe–5Co strip resulted in a very narrow hysteresis loop indicating a very small hysteresis loss. The present study shows that mechanical alloying–sintering–hot rolling route can be a promising method for producing bulk nanocrystalline materials.
doi_str_mv 10.1016/j.jallcom.2008.08.051
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subjects Bulk nanocrystalline material
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Fe and its alloys
Magnetic properties and materials
Mechanical alloying
NiFeCo alloy
Permalloy
Physics
Soft magnetic material
Studies of specific magnetic materials
title Studies on the bulk nanocrystalline Ni–Fe–Co alloy prepared by mechanical alloying–sintering–hot rolling route
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