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OwnerSeunghwan PARK, Satoshi HIRANO +6inventors
InventorsSeunghwan PARK, Satoshi HIRANO, Shinya IMANO, Jun SATO, Hiroyuki KOKAWA, Yutaka SATO, Kiyohito ISHIDA, Toshihiro OMORI
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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 γ′ 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 μ phase, a Laves phase and a carbide phase.
A friction stir tool formed of a Co-based alloy having a γ phase with an A1 structure and a γ′ phase with an L12 structure precipitated in the γ phase, the γ′ phase comprising (Co, X)3(Al, W, Z), and the γ′ phase being contained in the γ phase in an amount of 10% to 80% in terms of volume fraction, the Co-based alloy including 30-50 at. % of Ni, and the γ′ phase thereof having a solid solution forming temperature higher than 1,000° C., wherein the Co-based alloy contains a precipitate selected from a μ phase, a Laves phase and a carbide, where X includes mainly Ni, and Z includes mainly Cr and Ta.
Dependencies are inferred from the claim text.