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Improvement of thermal stability in hot-deformed Nd-Fe-B magnets by grain refinement

SCRIPTA MATERIALIA (2020)

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SCRIPTA MATERIALIA
卷 178, 期 -, 页码 129-133

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.11.018

关键词

Hot-deformed Nd-Fe-B; Nd-Fe-Ga-Cu addition; Thermal stability; Grain size; Grain refinement

类别

Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

资金

  1. Science and Technology Commission of Shanghai Municipality [16DZ2260602]

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The room-temperature coercivity of the hot-deformed magnet increased from 1.21 to 1.86 T and the coercivity at 180 degrees C increased from 0.33 to 0.70T by adding 8 wt.% Nd60Fe15Ga20Cu5 alloy powders. The temperature coefficient of coercivity increased from -0.469 to -0.402%/degrees C and is superior to that of most magnets. The microstructure revealed that the Nd2Fe14B grains were isolated by Nd-Ga-Cu-rich intergranular phases. Statistical analysis indicated that the average grain size was reduced by approximately 25%. Both the exchange decoupling between grains and the ultrafine grains were responsible for the improved thermal stability of the magnets without using heavy rare-earth elements. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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