Amorphization of Nd–Fe–B alloy under the action of high-pressure torsion

B.B. Straumal; A.R. Kilmametov; A.A. Mazilkin; S.G. Protasova; K.I. Kolesnikova; P.B. Straumal; B. Baretzky; Patrick Henry Regan

doi:10.1016/j.matlet.2015.01.041

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Amorphization of Nd–Fe–B alloy under the action of high-pressure torsion

Journal article

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Amorphization of Nd–Fe–B alloy under the action of high-pressure torsion

B.B. Straumal, A.R. Kilmametov, A.A. Mazilkin, S.G. Protasova, K.I. Kolesnikova, P.B. Straumal, B. Baretzky and Patrick Henry Regan

Materials letters, Vol.145, pp.63-66

15/04/2015

DOI: https://doi.org/10.1016/j.matlet.2015.01.041

Abstract

Amorphization

Permanent magnets

Phase transitions

Severe plastic deformation

The high pressure torsion (HPT) has been used for the severe plastic deformation (SPD) treatment of liquid-phase sintered hard magnetic NdFeB-based alloy (5GPa, 1rpm, 5 torsions, ambient temperature). The amorphization of the crystalline alloy under the action of HPT has been observed. HPT permitted to obtain for the first time the mixture of two different amorphous phases with embedded grains of the ferromagnetic Nd2Fe14B phase. The SPD-treatment at ambient temperature TSPD=300K is frequently equivalent to the heat treatment at a certain elevated temperature Teff>300K. The composition of phases in the studied NdFeB-based alloy after HPT corresponds to the state at Teff~1170°C. •The NdFeB-based alloy amorphises under the action of severe plastic deformation.•Such amorphisation has been observed for the first time.•Mixture of two different amorphous phases with embedded nanocrystals is formed.•One amorphous phase is Fe-rich, another is Nd-rich.

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Title: Amorphization of Nd–Fe–B alloy under the action of high-pressure torsion
Creators: B.B. Straumal - Institute of Solid State Physics
A.R. Kilmametov - Karlsruhe Institute of Technology
A.A. Mazilkin - Institute of Solid State Physics
S.G. Protasova - Institute of Solid State Physics
K.I. Kolesnikova - Institute of Solid State Physics
P.B. Straumal - National University of Science and Technology
B. Baretzky - Karlsruhe Institute of Technology
Patrick Henry Regan - Department of Physics
Publication Details: Materials letters, Vol.145, pp.63-66
Publisher: Elsevier B.V
Date published: 15/04/2015
Identifiers: 99783022702346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Amorphization of Nd–Fe–B alloy under the action of high-pressure torsion

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