Journal
MATERIALS TRANSACTIONS
Volume 57, Issue 11, Pages 1960-1965Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.M2016160
Keywords
neodymium-iron-boron magnet; coercivity; grain boundary; gallium addition
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As a part of the challenge of reducing the use of scarce rare-earth elements in magnets, a Dy-free Nd-Fe-B magnet with the remanence and coercivity of 1370 mT and 1830 kA/m, respectively, was investigated. The grain boundary was composed of mainly two phases, R6T13M and R-rich phases. The R6T13M phase formed at around 750 to 1000 K, and in that temperature range, coercivity improved and remanence decreased. By increasing the amount of grain boundary phases to 17.3 at% R addition, coercivity higher than 1990 kA/m (25 kOe) was realized.
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