Variation of hardness with temperature in sintered NdFeB magnets
- 15 April 1987
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 61 (8) , 3442-3444
- https://doi.org/10.1063/1.338747
Abstract
The variation of hardness of a sintered Nd15Fe78B7 magnet has been measured in the temperature range from room temperature to 750 °C. Relatively little change in hardness is observed below 200° or above 700°. A sharp drop in hardness begins at about 300°, with hardness decreasing to half its original value at 450° and to 10% of its original value at 650°. Melting of a Nd‐rich grain‐boundary phase begins at about 600 °C. The observed hardness behavior is consistent with reports of compression‐induced crystallographic alignment of NdFeB magnets at temperatures near 700 °C. High‐temperature microscopy and differential scanning calorimeter measurements on cast magnets of similar composition show that melting of a Nd‐rich grain‐boundary phase begins at about 600 °C.This publication has 2 references indexed in Scilit:
- Processing of Neodymium-Iron-Boron melt-spun ribbons to fully dense magnetsIEEE Transactions on Magnetics, 1985
- New material for permanent magnets on a base of Nd and Fe (invited)Journal of Applied Physics, 1984