TY - JOUR
T1 - Amorphous formation and magnetic properties of Nd-Fe-Co-Al alloys by gas flow type levitation process
AU - Azumo, Shuji
AU - Nagayama, Katsuhisa
PY - 2006/11
Y1 - 2006/11
N2 - It is reported that Nd-Fe-Co-Al amorphous alloys have high bulk amorphous formation ability and high coercivity by rapid solidification method. We have examined the undercooling solidification, bulk amorphous formation and high coercivity appearance by using containerless process. In this study, we investigated the undercooling, bulk amorphous formation and magnetic properties for Nd-Fe-Co-Al alloys which are levitated and solidified by using the gas jet flow and high cooling type electromagnetic levitation system. Therefore, the high undercooling degree was 66-152 K and the samples formed amorphous phase. The bulk samples, Φ6 mm sphere, solidified at the cooling rate, about 100 K/s. In addition, the coercivity for Nd65Fe10Co 15Al10 sample with bulk amorphous phase, 3.7kOe, was the highest value in all samples. Also, the thermal stability for Nd 65Fe10Co15Al10 sample was carried out by isothermal annealing experiments. The origin of high coercivity may be related to the amorphous phase.
AB - It is reported that Nd-Fe-Co-Al amorphous alloys have high bulk amorphous formation ability and high coercivity by rapid solidification method. We have examined the undercooling solidification, bulk amorphous formation and high coercivity appearance by using containerless process. In this study, we investigated the undercooling, bulk amorphous formation and magnetic properties for Nd-Fe-Co-Al alloys which are levitated and solidified by using the gas jet flow and high cooling type electromagnetic levitation system. Therefore, the high undercooling degree was 66-152 K and the samples formed amorphous phase. The bulk samples, Φ6 mm sphere, solidified at the cooling rate, about 100 K/s. In addition, the coercivity for Nd65Fe10Co 15Al10 sample with bulk amorphous phase, 3.7kOe, was the highest value in all samples. Also, the thermal stability for Nd 65Fe10Co15Al10 sample was carried out by isothermal annealing experiments. The origin of high coercivity may be related to the amorphous phase.
KW - Bulk amorphous phase
KW - Containerless process
KW - Gas jet flow type levitation
KW - High coercivity
KW - Neodymium-iron-cobalt- aluminum alloys
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U2 - 10.2320/matertrans.47.2842
DO - 10.2320/matertrans.47.2842
M3 - Article
AN - SCOPUS:33846312147
SN - 1345-9678
VL - 47
SP - 2842
EP - 2845
JO - Materials Transactions
JF - Materials Transactions
IS - 11
ER -