Amorphous Formation and Magnetic Properties of Nd-Fe-Co-Al Alloys by Gas Flow Type Levitation Process

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

“…Nd-Fe and Pr-Fe amorphous ribbons displayed hard magnetic properties at low temperatures. Additionally, Nd-Fe-Al and Nd-Fe-Co-Al amorphous alloys in bulk forms were found to exhibit high coercivity at room temperature 2,3,10,11) whereas these amorphous alloys in ribbon forms produced by a melt-spinning method exhibited soft magnetic properties. 10) Furthermore, the above-mentioned hard magnetic properties were not exhibited by the fully crystallized alloys.…”

“…10) Furthermore, the above-mentioned hard magnetic properties were not exhibited by the fully crystallized alloys. 3,10,11) Other bulk amorphous alloys do not exhibit hard magnetic properties like Nd-and Pr-based alloys. However, the solidification behavior of the amorphous or metastable phase formation for Pr-Fe based alloys has hardly ever been studied.…”

“…In order to obtain more insight into the solidification behavior of undercooled melts, metastable phase formation depending on the undercooling, and magnetic properties of the metastable phase, we have investigated rare-earth-based alloys for the above-mentioned characteristics with the gas flow levitation process. 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.…”

“…[1][2][3] Further, aerodynamic levitation, a containerless process, is widely used to examine the amorphous forming ability and solidification behavior associated with undercooling. [2][3][4] The aerodynamic levitation process differs from the conventional electromagnetic levitation method and enables a high cooling rate because the sample can avoid electromagnetic heating during the cooling. Furthermore, in this process, the cooling rate can be altered easily by changing the cooling gas or the amount of the cooling gas.…”