Kyoto University

Tanaka Kikinzoku Kogyo K.k.

Asaka Ueno

Yasushi Masahiro

Kunihiro Shima

Hiroo Iwata

Kenji Goto

Ryusuke Nakai

Tomonobu Kodama

The present invention provides an alloy for medical use including an Au&#x2014;Pt alloy, in which the Au&#x2014;Pt alloy has a Pt concentration of 24 mass % or more and less than 34 mass % with the balance being Au, and has at least a material structure in which a Pt-rich phase having a Pt concentration higher than that of an &#x3b1;-phase is distributed in an &#x3b1;-phase matrix, the Pt-rich phase has a Pt concentration that is 1.2 to 3.8 times the Pt concentration of the &#x3b1;-phase, and the Pt-rich phase has an area ratio of 1 to 22% in any cross-section. This alloy is an artifact-free alloy material that exhibits excellent compatibility with a magnetic field environment such as an MRI and has magnetic susceptibility of &#xb1;4 ppm with respect to magnetic susceptibility of water.

Alloy for medical use, and method for producing same

The present invention is an alloy for medical use including an Au&#x2014;Pt alloy, containing 34 to 36 mass % of Pt with the balance being Au, and having an &#x3b1;-phase single structure in which a ratio of a peak intensity (X) of a Pt (111) plane to a peak intensity (Y) of an Au (111) plane (X/Y) is 0.01 or less in an X-ray diffraction analysis. The alloy can be produced in such a manner that after the Au&#x2014;Pt alloy ingot is molten and cast, cold working and a heat treatment for homogenization are performed at least two times on the molten and cast alloy. The alloy of the present invention is an artifact-free material that exhibits excellent compatibility with a magnetic field environment such as an MRI and has magnetic susceptibility of &#xb1;4 ppm with respect to that of water.

Alloy for medical use and method of producing the same

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Tokyo, Japan

Asaka Ueno