Superelastic alloy

Patent metadata

Field	Value
Publication number	US-2016362772-A1
Application number	US-201414913810-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Aug 30, 2013
Publication date	Dec 15, 2016
Grant date	—

Abstract

The present invention provides a superelastic alloy formed by addition of Fe or Co to an Au—Cu—Al alloy, including: Cu of 12.5% by mass or more and 16.5% by mass or less; Al of 3.0% by mass or more and 5.5% by mass or less; Fe or Co of 0.01% by mass or more and 2.0% by mass or less; and a balance Au, and a difference between Al content and Cu content (Cu—Al) is 12% by mass or less. The superelastic alloy according to the present invention has superelastic property while being Ni-free, excellent X-ray imaging property, processability, and strength property, and is suitable for a medical field.

First claim

1 . A superelastic alloy formed by addition of Fe or Co to an Au—Cu—Al alloy, wherein the superelastic alloy comprises:
Cu of 12.5% by mass or more and 16.5% by mass or less;
Al of 3.0% by mass or more and 5.5% by mass or less;
Fe or Co of 0.01% by mass or more and 2.0% by mass or less; and
a balance Au, and further wherein a difference between Al content and Cu content (Cu—Al) is 12% by mass or less.

2 . The superelastic alloy according to claim 1 , wherein Au content is 78.7% by mass or more and 83.1% by mass or less.

3 . A method of manufacturing the superelastic alloy according to claim 1 , comprising the steps of:
melting and casting an alloy including Cu of 12.5% by mass or more and 16.5% by mass or less, Al of 3.0% by mass or more and 5.5% by mass or less, Fe or Co of 0.01% by mass or more and 2.0% by mass or less, and a balance Au; and performing a final heat treatment of heating and maintaining the alloy at 300 to 500° C. and then quenching the alloy.

4 . The method of manufacturing the superelastic alloy according to claim 3 , comprising the step of cold working the alloy before the step of the final heat treatment.

5 . A method of manufacturing the superelastic alloy according to claim 2 , comprising the steps of:
melting and casting an alloy including Cu of 12.5% by mass or more and 16.5% by mass or less, Al of 3.0% by mass or more and 5.5% by mass or less, Fe or Co of 0.01% by mass or more and 2.0% by mass or less, and a balance Au; and performing a final heat treatment of heating and maintaining the alloy at 300 to 500° C. and then quenching the alloy.

Assignees

• Tanaka Precious Metal Ind
• Toyo Inst Of Tech
• Tokyo Inst Tech

Inventors

• HOSADA Hideki
• Inamura Tomonari
• Tahara Masaki
• Morita Tomohiko
• Umise Akira
• Doi Yusuke
• Goto Kenji

Classifications

• C22F1/14 Primary

  of noble metals or alloys based thereon · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C21D2201/01

  Shape memory effect · CPC title

• C22C5/02 Primary

  Alloys based on gold · CPC title

• B22D21/005

  with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C · CPC title