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Title: Evolution of structural and magnetic properties due to nanocrystallization of mechanically milled amorphous Pr-Co-B powders

Abstract

In this paper, Pr 2Co 14B permanent magnet powders were prepared by mechanical milling of an arc-melted ingot. X-ray diffraction analysis revealed the presence of the 2:14:1 phase after 1 h of milling which transformed into an amorphous phase with additional milling time. Increasing the milling time also lowered the intrinsic coercivity while the saturation magnetization increased up to 105 emu/g. Differential scanning calorimetry measurements revealed a crystallization temperature of around 560 °C. Upon annealing 30 h of as-milled amorphous powders between 500 and 900 °C, we observed the precipitation of the 2:14:1 phase. Finally, the optimum post-milling annealing temperature was 600 °C with an intrinsic coercivity of 7 kOe and maximum energy product of 6 MGOe.

Authors:
 [1];  [2];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
Contributing Org.:
Ames Lab., Ames, IA (United States)
OSTI Identifier:
1286721
Alternate Identifier(s):
OSTI ID: 1420596
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 116; Journal Issue: 23; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ucar, Huseyin, Nlebedim, Ikenna C., Parans Paranthaman, M., and William McCallum, R. Evolution of structural and magnetic properties due to nanocrystallization of mechanically milled amorphous Pr-Co-B powders. United States: N. p., 2014. Web. doi:10.1063/1.4904359.
Ucar, Huseyin, Nlebedim, Ikenna C., Parans Paranthaman, M., & William McCallum, R. Evolution of structural and magnetic properties due to nanocrystallization of mechanically milled amorphous Pr-Co-B powders. United States. doi:10.1063/1.4904359.
Ucar, Huseyin, Nlebedim, Ikenna C., Parans Paranthaman, M., and William McCallum, R. Wed . "Evolution of structural and magnetic properties due to nanocrystallization of mechanically milled amorphous Pr-Co-B powders". United States. doi:10.1063/1.4904359. https://www.osti.gov/servlets/purl/1286721.
@article{osti_1286721,
title = {Evolution of structural and magnetic properties due to nanocrystallization of mechanically milled amorphous Pr-Co-B powders},
author = {Ucar, Huseyin and Nlebedim, Ikenna C. and Parans Paranthaman, M. and William McCallum, R.},
abstractNote = {In this paper, Pr2Co14B permanent magnet powders were prepared by mechanical milling of an arc-melted ingot. X-ray diffraction analysis revealed the presence of the 2:14:1 phase after 1 h of milling which transformed into an amorphous phase with additional milling time. Increasing the milling time also lowered the intrinsic coercivity while the saturation magnetization increased up to 105 emu/g. Differential scanning calorimetry measurements revealed a crystallization temperature of around 560 °C. Upon annealing 30 h of as-milled amorphous powders between 500 and 900 °C, we observed the precipitation of the 2:14:1 phase. Finally, the optimum post-milling annealing temperature was 600 °C with an intrinsic coercivity of 7 kOe and maximum energy product of 6 MGOe.},
doi = {10.1063/1.4904359},
journal = {Journal of Applied Physics},
number = 23,
volume = 116,
place = {United States},
year = {2014},
month = {12}
}

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Works referenced in this record:

Mechanical alloying and milling
journal, January 2001