# US 2016/0258043 A1 · Nickel titanium alloys, methods of manufacture thereof and article comprising the same

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- Number: US 2016/0258043 A1
- Document ID: US20160258043A1
- Status: Published application
- Kind: A1
- Application number: 14/552,988
- Filed: 2014-11-25
- Published: 2016-09-08
- Earliest claimed: 2013-11-27
- Assignees: University of Florida Research Foundation, Inc.
- Applicants: University of Florida Research Foundation, Inc.
- Inventors: Michele Viola Manuel; Derek Hsen Dai Hsu
- Web page: https://patentgrep.com/patent/US20160258043A1

## CPC

- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- C22C 1/00: Making non-ferrous alloys (by electrothermic methods C22B4/00; by electrolysis C25C1/24, C25C3/36)
- C22C 27/00: Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22F 1/006: {Resulting in heat recoverable alloys with a memory effect}
- C22F 1/18: High-melting or refractory metals or alloys based thereon
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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)

## Abstract

Disclosed herein is a shape memory alloy comprising 48 to 50 atomic percent nickel, 15 to 30 atomic percent hathium, 1 to 5 atomic percent aluminum; with the remainder being titanium. Disclosed herein too is a method of manufacturing a shape memory alloy comprising mixing together to form an alloy nickel, hafnium, aluminum and titanium in amounts of 48 to 50 atomic percent nickel, 15 to 30 atomic percent hafnium, 1 to 5 atomic percent aluminum; with the remainder being titanium; solution treating the alloy at a temperature of 700 to 1300° C. for 50 to 200 hours; and aging the alloy at a temperature of 400 to 800° C. for a time period of 50 to 200 hours to form a shape memory alloy.

## Claims

### Claim 1

A shape memory alloy comprising:
48 to 50 atomic percent nickel,
15 to 30 atomic percent hathium,
1 to 5 atomic percent aluminum; with the remainder being titanium.

### Claim 2 (depends on 1)

The shape memory alloy of claim 1, where the shape memory alloy has the formula Ni50Ti(30−x)Hf20Alx, where x can have a value of 1 to 5.

### Claim 3 (depends on 2)

The shape memory alloy of claim 2, where x has values of 1, 2, 3, 4, or 5.

### Claim 4 (depends on 1)

The shape memory alloy of claim 1, where the titanium is present in an amount of 25 to 30 atomic percent.

### Claim 5 (depends on 1)

The shape memory alloy of claim 1, where the alloy displays a compressive strength of 900 to 1200 MPa at a compressive strain of 1.5 to 5%.

### Claim 6 (depends on 1)

The shape memory alloy of claim 1, where a composition having 3 to 5 wt % aluminum based on the total weight of the alloy, has precipitates of 1 to 10 nanometers.

### Claim 7

A method of manufacturing a shape memory alloy comprising:
mixing together to form an alloy nickel, hafnium, aluminum and titanium in amounts of 48 to 50 atomic percent nickel, 15 to 30 atomic percent hafnium, 1 to 5 atomic percent aluminum; with the remainder being titanium;
solution treating the alloy at a temperature of 700 to 1300° C. for 50 to 200 hours; and
aging the alloy at a temperature of 400 to 800° C. for a time period of 50 to 200 hours to form a shape memory alloy.

### Claim 8 (depends on 5)

The method of claim 5, where the solution treating is conducted at 950° C. for 100 hours.

### Claim 9 (depends on 5)

The method of claim 5, where the aging the alloy is conducted at 600° C. for 100 hours.