Patent ID: 6427753
Filing Date: 2002-08-06
Classification: B21J,B22D,C22C

Abstract:
A process for producing a bulk metallic glass of desired shape that is free of cold shuts comprising the steps of:melting a metal material in a hearth with a high-energy heat source; pressing the molten metal at a temperature above a melting point of said metal material to deform the molten metal at a temperature above the melting point into the desired shape by at least one of compressive stress and shear stress with surfaces of the molten metal cooled to a temperature below the melting point of said metal material out of contact with each other during the pressing in order to avoid cold shuts; and cooling said molten metal at a cooling rate higher than a critical cooling rate of the metal material simultaneously with or after said deformation to produce the bulk metallic glass of the desired form that is free of cold shuts.