Hitachi, Ltd.

Tohoku University

Hiroyuki Kokawa

Jun Sato

Yutaka Sato

Satoshi Hirano

Shinya Imano

Kiyohito Ishida

Toshihiro Omori

Seunghwan Park

Seung Hwan Park

Kyosuke Yoshimi

It is an object to provide a friction stir tool excellent in productivity, high temperature strength, and wear resistance at high temperatures. The friction stir tool is formed of a Co-based alloy comprising crystal grains containing a &#x3b3;' precipitate phase dispersed and precipitated therein, and a crystal grain boundary region and a precipitate phase between adjacent crystal grains, in which the precipitate phase is at least one phase selected from a &#x3bc; phase, a Laves phase and a carbide phase.

Friction stir tool

An object of the present invention is to provide a friction stir welding tool which enables friction stir welding of a wide range of materials, from low-melting temperature metallic materials including aluminum to high-melting temperature metallic materials including steel. An entire friction stir welding tool or a tool tip including a pin is made of Mo alloy having a dual phase microstructure of Mo and intermetallic compound MoSiB. It is desirable that the Mo alloy be composed of 6.0 to 10.0 mol % of Si, 10.0 to 20.0 mol % of B, and 20 to 60% of Mo-phase volume content. This Mo alloy tool has excellent high-temperature strength and wear-resistance properties and hardly deform and wear when used for the welding of steel.

Friction stir welding tool and friction stir welding apparatus

Growing community of inventors

Sendai, Japan

Hiroyuki Kokawa