Other

Ykk Corporation

Yoshida Kogyo K.k.

Kenji Higashi

Akihisa Inoue

Tsuyoshi Masumoto

Katsumasa Ohtera

Makoto Kawanishi

Kazuhiko Kita

Junichi Nagahora

Yoshisada Michiura

Koji Saito

Masataka Kawazoe

Koju Tachi

Teruaki Onogi

Mitsuaki Kohara

Keiichi Maekawa

Masayoshi Kitagawa

Takeyuki Asaoka

High-strength, high-ductility aluminum alloy

A threaded fastener lighter in weight and easier to produce is made by the moderate temperature-forging, from a raw magnesium material that contains microcrystals whose diameter is about 100 &mgr;m or less. The raw material may be pure magnesium of industrial grade in one case, and alternatively be any magnesium alloy or such a composition as comprising as its matrix the alloy or pure magnesium, in the other cases. The raw material has a superplastic property and a fine-granulated metallographic internal texture, and when making the fastener, will be heated to 250-400&deg; C. at which superplasticity takes place to facilitate the forging to form the fastener. A method proposed in the invention to make the fastener is thus such that the number of necessary processing steps is reduced and manufacture cost is lowered.

Threaded fastener and a method of making same

An aluminum alloy material of high strength and high toughness and a method for the production thereof are disclosed. The material of high strength and high toughness is produced by laterally changing the direction of extrusion of the aluminum alloy thereby imparting shear deformation productive of such strain intensity equals as an equivalent elongation of not less than 220%, preferably not less than 10,000% to the material in the process of extrusion and reducing the average particle diameter of the grains of a microstructure of the material to minute grains not exceeding 1 micron in diameter. The step of extrusion is carried out at a temperature not exceeding 300.degree. C., preferably not exceeding the recrystallization temperature of the alloy, and more preferably not exceeding the recovery temperature thereof.

Method for extrusion of aluminum alloy and aluminum alloy material of

There is provided a compact and lightweight steam generator capable of efficiently and economically generating steam. An impeller is disposed in a housing. While the impeller is rotated by hot water poured inside the housing through a hot water inlet, the hot water is spread to generate steam inside the housing. By a ventilation fan to be operated in association with the impeller, the steam generated inside the housing is blown off into a shower room. The hot water poured inside the housing is discharged to the inside of a hot water reservoir through a discharge port. Steam generated inside the hot water reservoir, is drawn into the inside of the housing and then blown off into the shower room.

Steam generator

A superplastic aluminum-based alloy material consisting of a matrix formed of aluminum or a supersaturated aluminum solid solution, whose average crystal grain size is 0.005 to 1 .mu.m, and particles made of a stable or metastable phase of various intermetallic compounds formed of the main alloying element (i.e., the matrix element) and the other alloying elements and/or of various intermetallic compounds formed of the other alloying elements and distributed evenly in the matrix, the particles having a mean particle size of 0.001 to 0.1 .mu.m. The superplastic aluminum-based alloy material is produced from a rapidly solidified material consisting of an amorphous phase, a microcrystalline phase or a mixed phase thereof by optionally heat treating at a prescribed temperature for a prescribed period of time and then subjecting to a single or combined thermo-mechanical treatment. The superplastic aluminum-based alloy material of the present invention is suited for to superplastic working.

Superplastic aluminum-based alloy material and production process thereof

A superplastic aluminum-based alloy material consisting of a matrix formed of aluminum or a supersaturated aluminum solid solution, whose average crystal grain size is 0.005 to 1 .mu.m, and particles made of a stable or metastable phase of various intermetallic compounds formed of the main alloying element (i.e., the matrix element) and the other alloying elements and/or of various intermetallic compounds formed of the other alloying elements and distributed evenly in the matrix, the particles having a mean particle size of 0.001 to 0.1 .mu.m. The superplastic aluminum-based alloy material is produced from a rapidly solidified material consisting of an amorphous phase, a microcrystalline phase or a mixed phase thereof by optionally heat treating the material at a prescribed temperature for a prescribed period of time and then subjecting it to a single or combined thermomechanical treatment. The superplastic aluminum-based alloy material of the present invention is suited for superplastic working.

Growing community of inventors

Tondabayashi, Japan

Kenji Higashi