MELT OVERHEATING METHOD FOR IMPROVED TOUGHNESS AND GLASS-FORMING ABILITY OF METALLIC GLASSES

摘要

A method of forming a bulk metallic glass is provided. The method includes overheating the alloy melt to a temperature above a threshold temperature, Ttough, associated with the metallic glass demonstrating substantial improvement in toughness compared to the toughness demonstrated in the absence of overheating the melt above Tliquidus, and another threshold temperature, TGFA, associated with the metallic glass demonstrating substantial improvement in glass-forming ability compared to the glass-forming ability demonstrated in the absence of overheating the melt above Tliquidus. After overheating the alloy melt to above Ttough and TGFA, the melt may be cooled and equilibrated to an intermediate temperature below both Ttough and TGFA but above Tliquidus, and subsequently quenched at a high enough rate to form a bulk metallic glass.

主权项

1. A method of forming a bulk metallic glass, comprising:
melting an alloy by heating the alloy to a temperature above the liquidus temperature, Tliquidus; overheating the alloy melt to an overheating temperature above a threshold temperature, Ttough, associated with the metallic glass demonstrating increased toughness compared to the toughness demonstrated by heating the melt just above Tliquidus and quenching the melt to form a bulk metallic glass.