Multi step processing method for the fabrication of complex articles made of metallic glasses
AssigneeYale University
InventorsJan Schroers, Thomas M. Hodges, Michael Kanik, Punnathat Bordeenithikasem
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Abstract
In one embodiment, the invention provides a process for thermoplastic forming of a metallic glass. For example, in one embodiment, the invention provides a process for thermoplastic forming of a metallic glass ribbons having a thickness of between about 50 to about 200 microns. Related articles of manufacture and processes for customizing articles in accordance with the process as described herein are also provided.
Claims21
A process for thermoplastic forming of a metallic glass, the process comprising the steps of:
- (a) providing an amorphous metallic glass feedstock, the feedstock comprising Pd43Ni10Cu27P20;
- (b) heating the feedstock at a first temperature which is equal to or greater than the glass transition temperature of the feedstock so that the feedstock is in a supercooled liquid state, thereby enabling a homogeneous first deformation treatment of the feedstock;
- (c) discontinuing heating of the feedstock while the crystallized volume fraction of the feedstock is less than a predetermined crystallized volume fraction;
- and
- (d) after a predetermined interval during which cooling of the feedstock occurs, reheating the feedstock at a second temperature so that the feedstock is in a supercooled liquid state, thereby enabling a homogeneous second deformation treatment of the feedstock;
- and
- (e) discontinuing reheating of the feedstock while the total crystallized volume fraction of the feedstock is less than said predetermined crystallized volume fraction.
A process for thermoplastic forming of metallic glass ribbons, the process comprising the steps of:
- (a) providing an amorphous metallic glass feedstock;
- (b) homogeneously treating the feedstock by heating the feedstock at a temperature which is equal to or greater than the glass transition temperature of the feedstock;
- (c) discontinuing heating of the feedstock when the feedstock has a crystallized volume fraction of less than a predetermined value;
- (d) after a predetermined interval, reheating the feedstock at a second temperature which is equal to or greater than the glass transition temperature of the feedstock so that the feedstock is in a supercooled liquid state, thereby enabling homogeneous deforming of the feedstock;
- (e) during the reheating of the feedstock, while the feedstock is at said second temperature, subjecting the feedstock to homogeneous deformation in the form of rolling the feedstock into ribbons;
- (f) either quenching the feedstock or subjecting the feedstock to controlled cooling;
- and
- (g) optionally annealing the feedstock, wherein during the heating and reheating of the feedstock, the feedstock exists as a supercooled liquid enabling homogenous deformation of the feedstock, and wherein the total crystallized volume fraction of the feedstock after the heating and reheating of the feedstock is lower than a preselected crystallized volume fraction.
Dependencies are inferred from the claim text.