METHODS FOR SHAPING HIGH ASPECT RATIO ARTICLES FROM METALLIC GLASS ALLOYS USING RAPID CAPACITIVE DISCHARGE AND METALLIC GLASS FEEDSTOCK FOR USE IN SUCH METHODS

摘要

The disclosure is directed to a method of forming high-aspect-ratio metallic glass articles that are substantially free of defects and cosmetic flaws by means of rapid capacitive discharge forming. Metallic glass alloys that are stable against crystallization for at least 100 ms at temperatures where the viscosity is in the range of 100 to 104 Pa-s are considered as suitable for forming such high-aspect-ratio articles.

主权项

1. A method of forming an article from a metallic glass alloy, the method comprising:
applying a quantum of electrical energy to the feedstock using a rapid capacitive discharge forming system to heat the feedstock to a temperature above the glass transition where the viscosity of the metallic glass alloy is in the range of 100 to 104 Pa-s, wherein the feedstock comprising a metallic glass alloy having a uniform cross-section, the metallic glass alloy being capable of resisting crystallization for at least 100 ms at a temperature above the glass transition at said viscosity; shaping the heated feedstock into an article having an aspect ratio of at least 10; and cooling the shaped article to a temperature below the glass transition temperature of the metallic glass alloy sufficiently fast to avoid crystallization of the metallic glass.