| 摘要 |
PURPOSE:To develop an Al alloy having superior wear resistance, friction characteristic, machinability, and forgeability and suitable for drum for digital audio tape recorder, by incorporating specific amounts of Si, Cu, Mg, or further at least one element among Sn, Pb, and Bi to Al. CONSTITUTION:An Al alloy which has a composition containing, by weight, 14-25% Si, 0.5-5.0% Cu, and 0.3-3.0% Mg of further containing one or more kinds among 0.2-2.0% Sn, 0.2-2.0% Pb, and 0.2-2.0% Bi is refined and then cooled rapidly at >=10<2> deg.C/sec cooling rate so as to be formed into an Al-alloy powder in which the average grain size of Si grains and the average distance among Si grains are regulated to 0.3-3.5mum and <=10mum, respectively. This powder is subjected to heating and vacuum degassing and then to hot pressing so as to be formed into a drum. In this way, the lightweight drum for digital audio tape recorder excellent in wear resistance, machinability and forgeability and reduced in friction coefficient can be obtained.
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