A.l.m.t. Corporation

Ayuri Tsuji

Akihiko Ikegaya

Shigekazu Yamazaki

Masahiro Katoh

Hidenobu Nishino

Takanori Kadokura

Noboru Uenishi

Masahiro Kato

Seiji Nakabayashi

The present heat-resistant tungsten alloy has a first phase containing W as a major component, a second phase having a carbonitride of at least one element of Ti, Zr and Hf and containing the carbonitride as a major component when W is removed, and a third phase having a carbide of at least one element of group 5A elements in the periodic table and containing the carbide as a major component when W is removed, the heat-resistant tungsten alloy having a Vickers hardness of 550 Hv or more at a room temperature, a displacement of 1 mm or more when leading to fracture, as determined in a three point bending test at 1200&#xb0; C., and a 0.2% proof stress of 900 MPa or more, as determined in the three point bending test at 1200&#xb0; C.

Heat-resistant tungsten alloy, friction stir welding tool, and production method

A heat-resistant molybdenum alloy of this invention comprises a first phase containing Mo as a main component and a second phase comprising a Mo&#x2014;Si&#x2014;B-based intermetallic compound particle phase, wherein the balance is an inevitable impurity and wherein the Si content is 0.05 mass % or more and 0.80 mass % or less and the B content is 0.04 mass % or more and 0.60 mass % or less.

Heat-resistant molybdenum alloy

A heat-resistant member comprising a molybdenum alloy that comprises a first phase containing Mo as a main component and a second phase comprising a Mo&#x2014;Si&#x2014;B-based intermetallic compound particle phase, wherein the balance is an inevitable impurity and wherein the Si content is 0.05 mass % or more and 0.80 mass % or less and the B content is 0.04 mass % or more and 0.60 mass % or less. The member may be coated.

A heat-resistant alloy that satisfies physical properties such as proof stress and hardness adapted to an increase in the melting point of a welding object compared to conventional alloys is provided. The heat resistant alloy includes a first phase, as a main component, containing a Mo or W metal phase, a second phase containing a Mo&#x2014;Si&#x2014;B&#x2014;based alloy, and a third phase containing titanium carbonitride, wherein the balance is inevitable compounds and inevitable impurities.

Heat-resistant alloy and method of manufacturing the same

A Mo&#x2014;Si&#x2014;B-based alloy for a heat-resistant alloy that satisfies, more than conventional, physical properties such as proof stress and hardness adapted to an increase in the melting point of 5 a welding object. The Mo&#x2014;Si&#x2014;B-based alloy powder is such that the full width at half maximum of (600) of Mo5SiB2 in X-ray diffraction peak data is 0.08 degrees or more and 0.7 degrees or less.

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Toyama, Japan

Ayuri Tsuji