Methods of making bulk metallic glass from powder and foils

Patent metadata

Field	Value
Publication number	US-10501836-B2
Application number	US-201715493633-A
Country	US
Kind code	B2
Filing date	Apr 21, 2017
Priority date	Sep 21, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

Methods of forming a bulk metallic glass disclosed. The methods include packing a metallic glass-forming alloy powder to form a green body; heating the green body to a temperature between the glass transition temperature and the melting point of the metallic glass-forming alloy to form a heated green body; and cooling the heated green body to a temperature below the glass transition temperature of the metallic glass-forming alloy to form the bulk metallic glass. The methods of forming a bulk metallic glass also include packing one or more layers of an amorphous foil to form a green body; heating the green body to a temperature between the glass transition temperature and the melting point of the metallic glass-forming alloy to form a heated green body; and cooling the heated green body to a temperature below the glass transition temperature of the metallic glass-forming alloy to form the bulk metallic glass.

First claim

What is claimed is:

1. A method of forming a bulk metallic glass from a metallic glass-forming alloy comprising:
packing a metallic glass-forming alloy powder to form a green body;
heating the green body to a temperature between the glass transition temperature and the melting point of the metallic glass-forming alloy to form a heated green body; and
cooling the heated green body to a temperature below the glass transition temperature of the metallic glass-forming alloy to form the bulk metallic glass.

2. The method of claim 1 , wherein the metallic glass-forming alloy powder comprises amorphous particles.

3. The method of claim 1 , wherein the metallic glass-forming alloy powder comprises nanocrystals coated with an amorphous material.

4. The method of claim 3 , wherein the amorphous material has a different chemical composition than the nanocrystals.

5. The method of claim 1 , wherein the step of heating the green body is at a rate at least 1×10 5 K/s.

6. The method of claim 1 , wherein the metallic glass-forming alloy comprises one of a metallic glass selected from a group consisting of Cu-based, Al-based, Pt-based, Pd-based, Au-based, Ag-based, Ni-based, Fe-based, Co-based, Mg-based, Ti-based, and Zr-based metallic glass-forming alloys.

7. The method of claim 3 , wherein the amorphous material is a semiconductor.

8. The method of claim 7 , wherein the semiconductor comprises silicon.

9. The method of claim 3 , wherein each nanocrystal is smaller than 20 nm.

10. The method of claim 3 , wherein each nanocrystal is a single size.

11. The method of claim 1 , wherein the powder comprises particles having a bimodal size distribution.

12. The method of claim 1 , wherein the green body has a packing density of at least 70% by volume.

13. The method of claim 1 , further comprising heating the green body by one of RCDF, microwave heating, and pulse Joule heating.

14. The method of claim 3 , wherein the nanocrystals comprise at least one of Fe-based oxides, Ni-based oxides, Co-based oxides, or ceramic.

15. The method of claim 3 , wherein the nanocrystals are uniformly distributed in the bulk metallic glass.

16. A method of forming a metallic glass from a metallic glass-forming alloy, comprising:
packing one or more layers of an amorphous foil to form a green body;
heating the green body to a temperature between the glass transition temperature and the melting point of the metallic glass-forming alloy; and
cooling the heated green body to a temperature below the glass transition temperature to forming a bulk metallic glass.

17. The method of claim 16 , wherein the step of heating is at a rate of at least 10 5 K/s.

18. The method of claim 17 , wherein the step of packing comprises rolling the one or more layers of the amorphous foil.

19. The method of claim 18 , wherein the step of packing comprises:
stacking the layers of amorphous foil, and
applying pressure to the stacked layers of amorphous foil.

20. The method of claim 16 , wherein each layer has a thickness ranging from 10 μm to 1 mm.

Assignees

• Apple Inc

Inventors

• Yokoyama Yoshihiko
• Waniuk Theodore A
• Matsuyuki Naoto

Classifications

• H05B3/0004

  Devices wherein the heating current flows through the material to be heated (Circuit arrangements for heating by passing the current directly across the material to be heated H05B3/0023; granular, powdered or fluid material H05B3/60) · CPC title

• C22C1/11

  Making amorphous alloys · CPC title

• C22C45/10

  with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium {or Hf} as the major constituent · CPC title

• C22C2200/04

  Nanocrystalline · CPC title

• C22C2200/02

  Amorphous · CPC title