Nippon Light Metal Company, Ltd.

Mitsubishi Rayon Company, Limited

Tohoku University

Kanagawa Academy of Science and Technology

Hisakazu Ito

Tadahiro Ohmi

Eiko Okamoto

Hideki Masuda

Masafumi Kitano

Yoshihiro Uozu

Kota Shirai

Hiroaki Kita

Minoru Tahara

Masayuki Saeki

A method of production of an aluminum alloy inhibiting oxidation loss of the alloy melt without the use of Be which is liable to affect the human health. When preparing an aluminum alloy melt containing Mg, the method adds to the alloy, Ca, Sr, and/or Ba in a composition ratio within a range enclosed by lines connecting four points illustrated in FIG.of a point A (Ca: 18 at %, Sr: 0 at %, and Ba: 82 at %), point B (Ca: 14 at %, Sr: 34 at %, and Ba: 52 at %), point C (Ca: 33.8 at %, Sr: 66.2 at %, and Ba: 0 at %), point D (Ca: 100 at %, Sr: 0 at %, and Ba: 0 at %) and excluding point D so as to adjust the Ca, Sr, and Ba components in the melt to include Ca: 0.001 to 0.5 mass % and one or both of Sr: 0.01 to 2.8 mass % and Ba: 0.01 to 7.83 mass %.

Method of production of aluminum alloy

The present invention relates to an aluminum die base material for a stamper having a component composition that contains 0.5% by weight to 3.0% by weight of Mg, the total amount of elements other than Mg, including unavoidable impurities, is 500 ppm or less, and the remainder is composed of Al, and a forged structure in which the average crystal grain size is 1000 &#x3bc;m or less and the surface area ratio of second phase particles is 0.10% or less. According to the present application, a stamper can be provided in which, together with the crystal grain size of the aluminum being refined, the formation of second phase particles is inhibited, surface irregularities attributable to mirrored surface polishing are reduced, and a uniform relief pattern is formed by anodic oxidation treatment.

Aluminum base die material for stamper, aluminum base die for stamper and stamper

Provided is an Al alloy member with an excellent mechanical strength that is sufficient for use in large-scale manufacturing apparatuses. The Al alloy member is characterized in that, in mass %, Mg concentration is 5.0% or less, Ce concentration is 15% or less, Zr concentration is 0.15% or less, the balance comprises Al and unavoidable impurities, the elements of the unavoidable impurities are respectively 0.01% or less, and the Vickers hardness of the Al alloy member is greater than 30.

Al alloy member, electronic device manufacturing apparatus, and method of manufacturing an anodic oxide film coated al alloy member

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Shizuoka, Japan

Hisakazu Ito