Abstract
Fe based metallic glassy alloys are prospective material for micro parts due to their excellent mechanical properties. In this study we successfully prepared two kinds of [(FeXCo1−X)0.75Si0.05B0.2]96Nb4 (X=0.5 and 0.8) alloy mono-sized spherical particles with various sizes as a raw material for the micro parts by using originally developed process named Pulsated Orifice Ejection Method. Each alloy exhibits different critical diameter for maintaining a glassy phase due to the different glass forming ability. We estimated the critical cooling rates of X=0.5 and 0.8 alloys to be 1000 K/s and 4000 K/s, respectively from calculation of cooling process during the free fall of the molten alloy droplets in cooling gas. Oxygen contamination amounts of the obtained particles are also investigated for the comparison between the conventional casting process and our new process.
