Aluminum alloy disk blank for magnetic disk and magnetic disk

The present invention relates to an aluminum alloy disc blank for a magnetic disk, which is characterized by being formed from an aluminum alloy containing 0.005-1.800 mass% of Fe, the remainder comprising Al and unavoidable impurities, and by having a change in flatness of 2.0 [mu] m or less when t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HATAKEYAMA HIDEYUKI, NAKAMURA TOSHIHIRO, YAMADA RYOUHEI, KITAWAKI KOTARO, SAKAMOTO RYO, KUMAGAI WATARU, TODO SHINPEI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to an aluminum alloy disc blank for a magnetic disk, which is characterized by being formed from an aluminum alloy containing 0.005-1.800 mass% of Fe, the remainder comprising Al and unavoidable impurities, and by having a change in flatness of 2.0 [mu] m or less when the aluminum alloy disc blank for a magnetic disk is held in the atmosphere at 50 DEG C or less for 336 hours. 本发明涉及一种磁盘用铝合金盘坯，其特征在于，其由铝合金形成，所述铝合金含有Fe：0.005～1.800质量％，余量由Al和不可避免的杂质构成，在大气中将磁盘用铝合金盘坯在50℃以下保持336小时时的磁盘用铝合金盘坯的平坦度变化为2.0μm以下。