Mitsubishi Jukogyo Kabushiki Kaisha

Kobe Steel, Ltd.

Shoji Ueda

Nobuyuki Nagai

Takashi Daikoku

Yasuo Moriguchi

Yorimasa Takeda

Akira Hiromoto

Yoshimasa Ito

Shuzi Ono

Yoshimasa Itoh

Hideo Tsunoda

Masato Zama

Masahiro Saito

Hiroshi Sakaguchi

Shintaro Matsuo

Hidejiro Kinoshita

An alloy containing Mn in an amount of from 5 to 30 weight percent, at least one member selected from the group consisting of Sn of an amount of not more than 5 weight percent, Al of an amount of not more than 8.5 weight percent, Zn of an amount of not more than 7 weight percent, Fe of an amount of not more than 2.5 weight percent, and Ni of an amount of not more than 2.5 weight percent, and the balance to make up 100 weight percent of Cu plus normally entrained impurities produces a metallic material proof against the attachment thereto of marine organisms when the alloy fulfils a requirement that it should possess an .alpha.(face-centered cubic lattice) single-phase structure.

Metallic material proof against attachment of marine organisms

In a process for heat treating titanium alloys, and .alpha.+.beta. titanium alloy, heated and held in a temperature range above 500.degree. C. and below the .alpha.+.beta./.beta. transformation point, and then quenched, is further aged at a low temperature in the range between 50.degree. and 300.degree. C.

Heat treatment of titanium alloys

A titanium alloy having a high degree of internal friction and suitable for rotating blades of turbomachines is composed of 5.5 - 6.75% Al, 1 - 5% V, 1 - 5% Mo, V plus Mo being greater than or equal to 5%, and the balance Ti and usual impurities, all by weight. A method of heat-treating the alloy comprises maintaining the same at a temperature not lower than 125.degree. C below its .beta. transformation point for a predetermined period of time and then rapidly cooling the alloy.

Titanium alloy with high internal friction and method of heat-treating

A method for producing a reduced-pressure shaped mould comprises the steps of placing a pattern having gas-permeable orifices on a surface plate and adhering a coating film that is soluble in a solvent to the pattern by suction through the orifices. A flask having evacuating means is then placed on the surface plate on top of the film and the space portion defined by the film and the flask is filled with solid particles containing no caking agent which serves as a mould material. The mould material and flask are covered with an air-tight sheet and the evacuating means of the flask is actuated while that of the surface plate is released so that the sheet and coating film adhere to the upper and low surfaces respectively of the mould material by suction. The pattern and surface plate are then separated from the flask and a solution containing caking agent dissolved in the solvent is applied to the coating film which is adhered to the surface of a cavity formed at the lower surface of the mould material. The caking agent penetrates interstices between the solid particles whereby a layer that has been hardened by the caking agent may be formed in a surface layer portion bounding the cavity.

Method for producing a reduced-pressure shaped mould

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Nagasaki, Japan

Shoji Ueda