Tanaka Kikinzoku Kogyo K.k.

Tohoku Techno Arch Co., Ltd.

Tatsuya Nakazawa

Koichi Sakairi

Kunihiro Tanaka

Kiyohito Ishida

Toshihiro Omori

Yutaka Sato

Muneki Nakamura

Akira Yoshikawa

Yuui Yokota

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1-structured &#x3b3;' phase present in the matrix, and including at least one of Zr: 0.01 mass % or more and 3.0 mass % or less and Hf: 0.01 mass % or more and 3.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni&#x2014;Ir&#x2014;Al&#x2014;W-based alloy, and is also excellent in ambient-temperature strength.

Ni-based heat-resistant alloy

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1-structured &#x3b3;' phase present in the matrix, and including at least one of Ru: 0.8 mass % or more and 5.0 mass % or less and Re: 0.8 mass % or more and 5.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni&#x2014;Ir&#x2014;Al&#x2014;W-based alloy, and is also excellent in ambient-temperature strength.

The present invention provides a metal wire rod composed of iridium or an iridium alloy, wherein the number of crystal grains on any cross-section in a longitudinal direction is 2 to 20 per 0.25 mm, and the Vickers hardness at any part is 200 Hv or more and less than 400 Hv. The iridium wire rod is a material which is produced by a &#x3bc;-PD method, and has low residual stress and which has a small change in the number of crystal grains and hardness even when heated to a temperature equal to or higher than a recrystallization temperature (1200&#xb0; C. to 1500&#xb0; C.). The metal wire rod of the present invention is excellent in oxidative consumption resistance under a high-temperature atmosphere, and mechanical properties.

Metal wire rod composed of iridium or iridium alloy

The present invention relates to a NiIr-base heat-resistant alloy which includes a Ni&#x2014;Ir&#x2014;Al&#x2014;W-base alloy which contains Ir: 5.0 to 50.0 mass %, Al: 1.0 to 8.0 mass %, W: 5.0 to 20.0 mass %, and the balance is Ni, and a &#x3b3;' phase having an L1structure precipitating and dispersing in a matrix as an essential strengthening phase, and a ratio (Y/X) of a peak intensity (Y) of (201) plane of the IrW phase observed in the range of 2&#x3b8;=48&#xb0; to 50&#xb0; to a peak intensity (X) of (111) plane of the &#x3b3;&#x2032; phase observed in the range of 2&#x3b8;=43&#xb0; to 45&#xb0; in X-ray diffraction analysis is 0.5 or less. The alloy exhibits good high-temperature property stably.

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Hiratsuka, Japan

Tatsuya Nakazawa