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Methods for shaping high aspect ratio articles from metallic glass alloys using rapid capacitive discharge and metallic glass feedstock for use in such methods

a technology of metallic glass alloys and feedstocks, which is applied in the field of methods and metallic glass alloy feedstocks, can solve the problems of releasing energy and corresponding sharp rise in temperatur

Active Publication Date: 2015-07-16
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for shaping high-aspect ratio articles using a metallic glass alloy. The method involves heating the alloy to a temperature above its glass transition temperature and applying a quantum of electrical energy to it. The alloy is then shaped into the desired shape and cooled quickly to avoid crystallization. The resulting article has high-aspect ratio features, meaning it has a high ratio of length to thickness. The method can be used to screen metallic glass alloys for use in making high-aspect ratio parts. The metallic glass alloy used can be any of a variety of compositions and can have a unique crystallization time window. The shaped article formed from the feedstock has features with high aspect ratio and can be cooled to room temperature. The technical effect of this patent is to provide a method for shaping high-aspect ratio articles using metallic glass alloys.

Problems solved by technology

Crystallization of the alloy results in the release of energy and corresponding sharp rise in temperature.

Method used

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  • Methods for shaping high aspect ratio articles from metallic glass alloys using rapid capacitive discharge and metallic glass feedstock for use in such methods
  • Methods for shaping high aspect ratio articles from metallic glass alloys using rapid capacitive discharge and metallic glass feedstock for use in such methods
  • Methods for shaping high aspect ratio articles from metallic glass alloys using rapid capacitive discharge and metallic glass feedstock for use in such methods

Examples

Experimental program
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Effect test

example 1

Screening of Ni—Based Alloys

[0092]To explore the processing window and the RCDF shaping capabilities as a function of composition, the family of Ni—Cr—Nb—P—B glass-forming alloys disclosed in U.S. patent application Ser. No. 13 / 592,095, entitled “Bulk Nickel-Based Chromium and Phosphorus Bearing Metallic Glasses”, filed on Aug. 22, 2012, and Ser. No. 14 / 067,521, entitled “Bulk Nickel-Based Chromium and Phosphorus Bearing Metallic Glasses with High Toughness”, filed on Oct. 30, 2013, the disclosures of which are incorporated herein by reference in their entirety, was investigated. Experimental data and model fitting for the viscosity of Ni68.17Cr8.65Nb2.98P16.42B3.28Si0.5 metallic glass are presented in FIG. 1. Ni—Cr—Nb—P—B metallic glasses and generally metallic glasses whose composition is governed by EQ. 2 were expected to exhibit viscosity similar to Ni68.17Cr8.65Nb2.98P16.42B3.28Si0.5 metallic glass. As shown by the shaded area in FIG. 1, Ni68.17Cr8.65Nb2.98P16.42B3.28Si0.5 meta...

example 2

Assessing a Cu-Based Alloy

[0097]To further explore the processing window and the RCDF shaping capabilities, a Cu—Ti—Zr—Ni glass-forming alloy was also investigated. Experimental data and model fitting for the viscosity of Cu47Ti34Zr11Ni8 metallic glass is presented in FIG. 6. Cu—Ti—Zr—Ni metallic glasses in general were expected to exhibit viscosity similar to Cu47Ti34Zr11Ni8 metallic glass. As shown by the shaded area in FIG. 6, Cu47Ti34Zr11Ni8 metallic glass exhibited a viscosity within the desirable viscosity range of 100 and 104 Pa-s at temperatures in the range of 570-810° C. The RCDF heating curves were produced for metallic glass Cu47Ti33Zr11Ni8Si1 alloy heated to different temperatures, achieved by adjusting the energy discharge through various samples. The crystallization times obtained by RCDF heating to various plateau temperatures within the range of 570-810° C. are listed in Table 2. At each plateau temperature, the time to crystallization tcryst was recorded and plotte...

example 3

Correlation with ΔT

[0098]Differential scanning calorimetry was also performed for these alloys. The metallic glass alloys were scanned to above Tg at a constant heating rate of 0.67° C. / s. The differential calorimetry scans for Ni68.17Cr8.65Nb2.98P16.92B3.28 and Ni72.5Cr4.5Nb3.5P16.5B3 metallic glasses are presented in FIG. 8. The scans reveal that metallic glass alloy Ni68.17Cr8.65Nb2.98P16.92B3.28, which demonstrated long tcryst in the temperature range of 525-675° C., also demonstrated a large ΔT of about 55° C. By contrast, metallic glass alloy Ni72.5Cr4.5Nb3.5P16.5B3, which demonstrated short tcryst in the temperature range of 525-675° C., demonstrated a significantly smaller ΔT of about 42° C.

[0099]Differential scanning calorimetry was also performed for metallic glass alloys Ni68.5Cr9Nb3P15.5B3Si1, Ni71.4Cr5.52Nb3.38P16.67B3.03, whose TTT curves are also presented in FIG. 5, and for metallic glass alloy Cu47Ti33Zr11Ni8Si1, whose TTT curve is presented in FIG. 8. The data for ...

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Abstract

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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of U.S. Provisional Patent Application No. 61 / 793,904, entitled “Methods for Shaping High Aspect Ratio Articles from Metallic Glass Alloys Using Rapid Capacitive Discharge and Metallic Glass Feedstock for Use in Such Methods”, filed on Mar. 15, 2013, which is incorporated herein by reference in its entirety.FIELD[0002]The present disclosure is directed to methods and metallic glass alloy feedstock that are capable of being shaped into high aspect ratio articles using rapid capacitive discharge forming.BACKGROUND[0003]U.S. Patent Publication No. 20090236017 is directed to a method of rapidly heating and shaping a metallic glass using a rapid discharge of electrical current. A quantum of electrical energy is discharged with near uniformity through a metallic glass feedstock having a substantially uniform cross-section. The sample is rapidly heated substantially uniformly to a processing temperature...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C45/00C22B4/06
CPCC22B4/06C22C45/00C21D1/40C22F1/002C22F1/10C21D2201/03C22C45/001C22C45/04A61L27/04C22C1/11
Inventor SCHRAMM, JOSEPH P.NA, JONG HYUNDEMETRIOU, MARIOS D.LEE, DAVID S.JOHNSON, WILLIAM L.
Owner APPLE INC
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