Ykk Corporation

Other

Masataka Kawazoe

Junichi Nagahora

Futoshi Kozato

Yusuke Meiwa

Kenji Higashi

Koichi Mikado

Hironobu Wakasa

An aluminum alloy with excellent decorativeness, having a composition represented by the general formula AlMgMnCr, wherein b, c, and d are, in mass percentage, 3.0&#x2266;b&#x2266;5.6, 0.05&#x2266;c&#x2266;1.0, 0.05&#x2266;d&#x2266;0.7, c+d&#x3e;0.2, and a is the balance with unavoidable impurity elements possibly being contained, wherein a matrix of the aluminum alloy is a structure substantially composed of an aluminum solid solution, in which no &#x3b2;-phase is present. This alloy has excellent decorativeness and decorativeness as well as superior strength, hardness and other such mechanical properties and is useful as materials for slide fastener constituent members, such as their elements, stops, and sliders, and/or in snap buttons, ordinary buttons, and clasps.

Aluminum alloy with excellent decorativeness

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

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Sendai, Japan

Masataka Kawazoe