Bulk Nd-Fe-Al Amorphous Alloys with Hard Magnetic Properties
作者： Akihisa Inoue , Tao Zhang , Wei Zhang , Akira Takeuchi
DOI: 10.2320/MATERTRANS1989.37.99
关键词:
摘要: An amorphous phase in Nd-Fe-Al system was formed an extremely wide composition range of 0 to 90 at% Fe and 93 Al by melt spinning. Based on the information formation, ferromagnetic Nd 90-x x 10 bulk alloys with high coercive force at room temperature were obtained a copper mold casting method. The maximum diameter cylindrical samples length 50 mm is about 7 for 20%Fe alloy 4 30%Fe alloy. Neither glass transition nor supercooled liquid region observed before crystallization, being different from previous glassy exhibiting crystallization. onset crystallization (T ) melting m are measured be 778 863 K, respectively, 70 20 resulting reduced ratio T /T as 0.90 interval between small 85 K. ΔT (=T -T values reason achievement large glass-forming ability. has ferromagnetism Curie c 600 K which much higher than highest (about 480 K) Nd-Fe binary ribbons. remanence (B,) intrinsic ( i H 60 30 0.122 277 kA/m, as-cast state 0.128 annealed s B r 1 decrease 0.045 265 crystallized sample consisting Nd+Al 2 Nd+δ phases hard magnetic properties achieved state. presumably due homogeneous development clusters random anisotropy. finding promising future new type metallic permanent magnet.
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