Melt fluxing method for improved toughness and glass-forming ability of metallic glasses and glass-forming alloys

Inactive Publication Date: 2015-06-11
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent text describes the methods for producing metallic glass with specific properties such as notch toughness and the ability to undergo macroscopic plastic deformation without fracturing catastrophically. The technical effect of the invention is to provide a reliable method for producing metallic glass with consistent and reproducible properties, which can be useful in various applications such as engineering materials.

Problems solved by technology

However, the U.S. Pat. No. 5,797,433 patent did not demonstrate, suggest, or imply that overheating the melt above some threshold temperature would have any influence on the mechanical properties of the amorphous metal, such as the fracture toughness.

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  • Melt fluxing method for improved toughness and glass-forming ability of metallic glasses and glass-forming alloys
  • Melt fluxing method for improved toughness and glass-forming ability of metallic glasses and glass-forming alloys
  • Melt fluxing method for improved toughness and glass-forming ability of metallic glasses and glass-forming alloys

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Embodiment Construction

[0066]The disclosure is directed to a method of fluxing the melt of a metallic glass forming alloy prior to quenching as means for improving the toughness of the metallic glass produced from the alloy and the glass-forming ability of the alloy, and also as means to recycle the alloy. In some aspects of the disclosure, if an alloy is fluxed according to the disclosed methods, the notch toughness of the metallic glass produced from the fluxed alloy does not change substantially when varying the melt overheating temperature.

[0067]The notch toughness of a metallic glass can vary with changing processing parameters. If an alloy is not fluxed according to the disclosed methods, the notch toughness of the metallic glass produced from the alloy can vary dramatically if the alloy melt overheating temperature is varied prior to producing the metallic glass. In one non-limiting example, when the melt overheating temperature prior to producing the metallic glass is below 1250° C., the notch tou...

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Abstract

A method of fluxing the melt of metallic glass forming alloys is provided. Alloys fluxed according to the disclosed methods demonstrate a critical rod diameter that does not vary by more than 60% when varying the melt overheating. Moreover, metallic glasses produced from alloys fluxed according to the disclosed methods demonstrate notch toughness that does not vary by more than 30% when varying the melt overheating. Furthermore, a method by which used feedstock is purified such that its toughness and glass forming ability is restored for reuse is also disclosed. Recycled feedstock purified according to the disclosed method demonstrates critical rod diameter that is at least 70% of the critical rod diameter of the as-formed alloy. Also, metallic glasses produced from recycled feedstock demonstrate notch toughness of at least 70% of the notch toughness of a metallic glass produced from the as-formed alloy.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of U.S. Provisional 61 / 913,732, entitled “Melt Fluxing Method for Improved Toughness and Glass-Forming Ability of Metallic Glasses and Glass-Forming Alloys,” filed on Dec. 9, 2013, and U.S. Provisional 62 / 048,614, entitled “Melt Fluxing Method for Improved Toughness and Glass-Forming Ability of Metallic Glasses and Glass-Forming Alloys,” filed on Sep. 10, 2014, which are incorporated herein by reference in their entirety.TECHNICAL FIELD[0002]The disclosure is directed to a method of fluxing the melt of metallic glass forming alloys prior to quenching as means for improving the toughness and glass-forming ability, and also as means to recycle the alloy.BACKGROUND[0003]U.S. Pat. No. 5,797,443 is directed to a method of overheating the melt of a Zr-based metallic glass forming alloy above a threshold temperature, which is higher than the alloy liquidus temperature, in order to effect an increase in ...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C45/02C22C45/04C22C45/00
CPCC22C1/002C22C45/00C22C45/003C22C45/04C22C45/001C22C45/02C22C45/008C22C1/11
InventorNA, JONG HYUNCREWDSON, CHASEDUGGINS, DANIELLEGARRETT, GLENNLAUNEY, MAXIMILIENDEMETRIOU, MARIOS D.JOHNSON, WILLIAM L.
OwnerAPPLE INC