Journal
MATERIALS LETTERS
Volume 145, Issue -, Pages 63-66Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.01.041
Keywords
Phase transitions; Severe plastic deformation; Amorphization; Permanent magnets
Funding
- Russian Foundation for Basic Research [15-03-01127, 14-48-03598, 14-42-03621]
- Government of Moscow Region, Ministry of Education and Science of the Russian Federation [14. A12.31.0001]
- Allianz Industrie Forschung [FE.5150.0028.4067]
- Karlsruhe Nano Micro Facility
- STFC [ST/J000051/1, ST/L005743/1] Funding Source: UKRI
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The high pressure torsion (HPT) has been used for the severe plastic deformation (SPD) treatment of liquid-phase sintered hard magnetic NdFeB-based alloy (5 GPa, 1 rpm, 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 T-SPD=300 K is frequently equivalent to the heat treatment at a certain elevated temperature T-eff > 300 K. The composition of phases in the studied NdFeB-based alloy after HPT corresponds to the state at T-eff similar to 1170 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
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