Abstract
Highly textured magnets of MQU-F material (Nd 13.6Fe 73.6Ga 0.6Co 6.6B 5.6) were produced by die-upsetting. A remanence B r=1.39 T, a coercivity μ 0j H c=1.18 T and an energy product (BH) max=370 kJ m −3 were obtained when using a relatively high degree of deformation (height reduction: 80%). Differential scanning calorimetry measurements reveal, beside an increase of the Curie temperature of the main phase, a substantial decrease of the melting point of the intergranular phase (660 °C) in comparison to that of the ternary alloy MQP-A (680 °C). The microstructure of the hot-deformed MQU-F material, especially of the intergranular phase, was investigated by high-resolution transmission electron microscopy and energy dispersive X-ray spectroscopy (EDX) in the scanning transmission electron microscopic mode with a subnanometer probe. A very homogeneous distribution of the intergranular phase was observed. The Nd 2Fe 14B crystals are surrounded by an amorphous Nd-rich phase with a thickness of 0.4 to 2 nm. EDX analysis shows that the grain boundaries are enriched in Nd and Ga. Also, a small amount of Co was detected.
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