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Indexed by:会议论文

Date of Publication:2011-11-08

Included Journals:EI、CPCI-S、Scopus

Volume:509

Page Number:185-+

Key Words:Metallic glasses; Mono-sized spherical particles; Critical cooling rate

Abstract:A new method to evaluate the critical cooling rate, R-c of Fe-based metallic glass alloy was proposed and discussed. [(Fe0.5Co0.5)(0.75)B0.2Si0.05](96)Nb-4 alloy particles were prepared with narrow size distribution and high sphericity by Pulsated Orifice Ejection Method in Ar, He and 50%Ar+50%He mixed atmosphere, respectively. Phase transition of a particle from amorphous to amorphous-crystalline and fully crystalline occurred with the increase of particle diameter. R-c of the formation of fully amorphous phase was estimated to be in the range of 700-1100 K/s, lower than that measured by time-temperature transformation diagram of bulk metallic alloy. No change of R-c occurred in Ar, He or 50%Ar+50%He mixed atmosphere, which proved it an effective method to evaluate the critical cooling rate of Fe-based metallic glass alloy.