Tokyo Institute of Technology

Tanaka Kikinzoku Kogyo K.k.

Furukawa Techno Material Co., Ltd.

The Furukawa Electric Co., Ltd.

University of Tsukuba

Hideki Hosoda

Kenji Goto

Shuichi Miyazaki

Toyonobu Tanaka

Hiroshi Horikawa

Masaki Tahara

Akira Umise

Tomonari Inamura

Yuri Shinohara

Keisuke Saito

Sumio Kise

Misato Fujii

Fumiyoshi Yamashita

Heeyoung Kim

Ryota Morishige

Kota Fuchiwaki

Buenconsejo Pio

The present invention provides a shape-memory alloy including a Au—Cu—Al alloy having 20 at % or more and 40 at % or less Cu and 15 at % or more and 30 at % or less Al, with the balance being Au and inevitable impurities. The shape-memory alloy has a Vickers hardness of 360 Hv or less. The Au—Cu—Al alloy of the present invention is an alloy capable of developing both biocompatibility and a shape-memory effect, and further capable of achieving artifactlessness in a magnetic environment. The Au—Cu—Al alloy can be produced by heat-treating a clad material formed of a combination of a hollow material made of a Au—Cu alloy and a core material made of metallic Al at 500° C. or more and 700° C. or less.

Shape-memory alloy and shape-memory alloy wire

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 an artifactless superelastic alloy including a Au&#x2014;Cu&#x2014;Al alloy, the superelastic alloy containing Cu in an amount of 20 atom % or more and 40 atom % or less, Al in an amount of 15 atom % or more and 25 atom % or less, and Au as a balance, the superelastic alloy having a bulk magnetic susceptibility of &#x2212;24 ppm or more and 6 ppm or less. The Ni-free superelastic alloy of the present invention is capable of exhibiting superelasticity in a normal temperature range, and hardly generated artifacts in a magnetic field environment. The alloy can be produced by setting a casting time in a melting and casting step to a fixed time, and hot-pressing an alloy after casting to make material structures homogeneous.

Artifactless 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]

Superelastic alloy

A Titanium-Tantalum base shape memory alloy is provided which possesses high machinability and is suitable for repeated high temperature operation. The Titanium-Tantalum base shape memory alloy consists of 15 mol %-40 mol % Tantalum, additive elements, and the balance Titanium and impurities.

Titanium-tantalum base shape memory alloys, actuator and engine

A super-elastic titanium alloy for medical use consisting essentially of:

Super-elastic titanium alloy for medical uses

Growing community of inventors

Tokyo, Japan

Hideki Hosoda