# US 10,370,752 B2 · Imprinting bulk amorphous alloys at room temperature

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- Number: US 10,370,752 B2
- Document ID: US10370752B2
- Status: Granted
- Kind: B2
- Application number: 15/093,536
- Filed: 2016-04-07
- Published: 2016-10-13
- Granted: 2019-08-06
- Earliest claimed: 2015-04-08
- Assignees: Iowa State University Research Foundation, Inc.
- Applicants: Iowa State University Research Foundation, Inc.
- Inventors: Min Ha Lee; Eun Soo Park; Ryan Timothy Ott; Jürgen Eckert
- Web page: https://patentgrep.com/patent/US10370752B2

## CPC

- C22F 1/186: {of zirconium or alloys based thereon}
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- C22C 1/11: Making amorphous alloys
- C22C 45/10: with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium {or Hf} as the major constituent
- C22F 1/08: of copper or alloys based thereon
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A technique is disclosed for straining an amorphous alloy at ambient temperature to plastically and homogeneously deform the amorphous alloy, such that at least an exterior surface of the deformed amorphous alloy is substantially free of shear bands. An amorphous alloy may be strained at a rate of less than about 9×10−5 s−1 or by multiple passes of cold rolling. A pattern from a die may be imprinted into the amorphous alloy when strained, and the amorphous alloy may be used as a die to plastically strain other materials.

## Claims

### Claim 1

A method comprising:
straining an amorphous alloy at about 25° C. to plastically and homogeneously deform at least a portion of the amorphous alloy to form a deformed amorphous alloy, wherein at least an exterior surface of the deformed amorphous alloy is substantially free of shear bands,
wherein the amorphous alloy is strained at a strain rate of less than about 9×10−5s−1,
wherein the amorphous alloy is strained by applying a force to the amorphous alloy to achieve a stress corresponding to between about 50% and about 95% of the yield strength of the amorphous alloy, and
wherein the amorphous alloy is strained with a patterned die to form one or more cavities in the amorphous alloy.

### Claim 2 (depends on 1)

The method of claim 1, wherein the amorphous alloy is strained by uniaxial compressive loading or uniaxial cyclic loading.

### Claim 3 (depends on 1)

The method of claim 1, wherein the patterned die comprises a pattern selected from at least one of a square, rectangle, circle, diamond or wave.

### Claim 4 (depends on 1)

The method of claim 1, wherein the patterned die comprises at least one of tungsten (W), molybdenum (Mo), ruthenium (Ru), carbon (C), carbon nanotubes, carbon fiber, or graphene.

### Claim 5 (depends on 1)

The method of claim 1, wherein the amorphous alloy comprises a metallic glass with a glass transition temperature greater than about 100° C.

### Claim 6 (depends on 5)

The method of claim 5, wherein the metallic glass comprises at least one of Cu, Ni, hafnium (Hf), or zirconium (Zr).

### Claim 7 (depends on 5)

The method of claim 5, wherein the metallic glass comprises about 44.5 atomic percent (at. %) Hf, about 27 at. % Cu, about 13.5 at. % Ni, about 5 at. % Ti, and about 10 at. % Al (Hf44.5Cu27Ni13.5Ti5Al10).

### Claim 8 (depends on 1)

The method of claim 1, wherein the amorphous alloy lacks a glass transition.

### Claim 9 (depends on 8)

The method of claim 8, wherein the amorphous alloy comprises at least one of iron (Fe) or aluminum (Al).

### Claim 10 (depends on 1)

The method of claim 1, further comprising plastically deforming a second material with a die of the deformed amorphous alloy, wherein the second material comprises at least one of a metal or an amorphous alloy.