Tokyo Institute of Technology

Tanaka Kikinzoku Kogyo K.k.

The Furukawa Electric Co., Ltd.

Furukawa Techno Material Co., Ltd.

Tomonari Inamura

Masaki Tahara

Kenji Goto

Hideki Hosoda

Yuri Shinohara

Keisuke Saito

Sumio Kise

Misato Fujii

Fumiyoshi Yamashita

Akira Umise

Yusuke Doi

Ryota Morishige

Hideki Hosada

Tomohiko Morita

Kota Fuchiwaki

A Ti&#x2014;Ni-based alloy, which has a torsion angle for Interface I that is a junction plane between habit plane variants of a martensitic phase, of less than 1.00&#xb0;; a wire, an electrically conductive actuator, and a temperature sensor, each of which uses that alloy; and a method of producing the Ti&#x2014;Ni-based alloy.

Ti&#x2014;Ni-based alloy; wire, electrically conductive actuator, and temperature sensor, each using this alloy; and method of producing a Ti&#x2014;Ni-based alloy

The present invention provides a superelastic alloy formed by addition of Fe or Co to an Au&#x2014;Cu&#x2014;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&#x2014;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.

Superelastic alloy

The present invention provides a superelastic alloy containing Au in an amount of 8.0% by mass or more and 20.0% by mass or less and at least one of Cr and Mo as essential additive elements, Ta as an optional additive element, and Ti and inevitable impurities as a balance, wherein the Cr equivalent calculated on the basis of the following formula for the relationship of the Cr content, the Mo content and the Ta content is within the range of more than 0.5 and less than 8.0. The alloy is a Ni-free superelastic alloy, and has favorable X-ray-imaging property. Accordingly, the alloy can be suitably used in medical fields.Cr equivalent=[Cr content (% by mass)]+([Mo content (% by mass)]/1.7)+([Ta content (% by mass)]/15)&#x2003;&#x2003;[Formula 1]

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Tokyo, Japan

Tomonari Inamura