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Evaluation on Liquid Formability of Bulk Amorphous Alloys  

Joo, Hye-Sook (Dept. of Materials Engineering, Yonsei University)
Kang, Bok-Hyun (Dept. of Materials Engineering, Korea University of Technology and Education)
Kim, Ki-Young (Dept. of Materials Engineering, Korea University of Technology and Education)
Publication Information
Journal of Korea Foundry Society / v.26, no.5, 2006 , pp. 227-231 More about this Journal
Abstract
Liquid formability of bulk amorphous alloys is known to be very poor due to their high viscosity comparing with conventional metallic materials. It is important to have the fabricating technology of bulk amorphous alloys in order to make the components with complicated shape. Liquid formability includes the mold cavity filling ability and the hot tear(crack) resistance during solidification. A mold made of a commercial tool steel for the formability test was designed. Melting was performed by the arc melting furnace with melting capacity of 200 g in an argon atmosphere. Liquid formability and glass forming ability of Cu base and Ni base bulk amorphous alloys were measured and evaluated. Mold filling ability of Ni-Zr-Ti-Si-Sn alloy was better than that of Cu-Ni-Zr-Ti alloy, however the reverse is the hot tear resistance. Bulk amorphous alloy is very susceptible to crack if partial crystallization occurs during solidification. Crack resistance was thought to be closely related with the glass forming ability.
Keywords
Bulk metallic glasses; Amorphous alloy; Liquid formability; Crack; Pore;
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