A new hard magnetic phase in binary Nd-Fe and Pr-Fe alloys

Cooling rate controlled microstructure and magnetic properties of metastable Fe20Nd80 alloys

“…Eutectic Fe-Nd alloys have been of considerable interest because of their important role in the sintering process and in the overall magnetic performance of Fe-Nd-B magnets [6][7][8]. Additional interest in the eutectic Fe-Nd alloys is due to the formation of several metastable phases and the resulting magnetic properties [9][10][11][12][13]. As early as 1935, a high coercivity of 0.45 T was reported in Nd-rich Fe-Nd alloys [9].…”

Structural and Magnetic Properties of As-Cast Fe–Nd Alloys

“…High coercivity (H ci % 8,6 kOe at RT and H ci % 59 kOe at 20 K) in rapidly quenched Nd 40 Fe 60 alloys was reported by Croat [2] [P. 125, 3 P 3161]. The coercive force of the as-cast Nd-rich Nd-Fe alloys is associated with the metastable anisotropic A 1 phase which is formed during crystallization and cooling below the eutectic temperature by decomposition of the Fe-rich regions within the metastable eutectic [4] [P. 215], [5] [P. 5971], [6] [P. L1], [7] [P. 169], [8] [P. 209], [9] [P. 245], [10] [P. L5], [11] [P. 273], [12] [P. 97], [13] [17] [P. 2483] high H ci of the melt-spun Fe-Nd alloys results from the different nonequilibrium hard magnetic phases. The size of the clusters or nanocrystallites in rapidly quenched Fe-Nd alloys is extremely small and its composition analysis was beyond the limits of TEM capacity at the time.…”

Undercooling Solidification and Magnetic Properties of Pr<SUB>90</SUB>Fe<SUB>10</SUB> Alloy Produced by the Gas Flow Levitation Method

“…2,3) Rare-earth-based alloys have been investigated due to their unique magnetic properties, complex crystallization behavior, and high amorphous forming ability. [5][6][7][8][9][10][11][12] In particular, the magnetic properties and microstructure of Nd-Fe based alloys have been studied due to their complex microstructure, good magnetic properties, and relation to the Nd-Fe-B permanent magnets by many researchers. Nd-Fe and Pr-Fe amorphous ribbons displayed hard magnetic properties at low temperatures.…”