Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1992-08-12
1993-09-14
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148552, 148691, 148439, C22F 104
Patent
active
052445160
ABSTRACT:
Disclosed herein is an aluminum alloy plate for discs superior in Ni-P platability and adhesionability of plated layer and having a high surface smoothness with a minimum of nodules and micropits, said aluminum alloy plate comprising an aluminum alloy containing as essential elements Mg in an amount more than 3% and equal to or less than 6%, Cu in an amount equal to or more than 0.03% and less than 0.3%, and Zn in an amount equal to or more than 0.03% and equal to or less than 0.4%, and as impurities Fe in an amount equal to or less than 0.07% and Si in an amount equal to or less than 0.06% in the case of semi-continuous casting, or Fe in an amount equal to or less than 0.1% and Si in an amount equal to or less than 0.1% in the case of strip casting, and also containing Al-Fe phase intermetallic compounds, with the maximum size being smaller than 10 .mu.m and the number of particles larger than 5 .mu.m being less than 5 per 0.2 mm.sup.2, and Mg-Si phase intermetallic compounds, with the maximum size being smaller than 8 .mu.m and the number of particles larger than 5 .mu.m being less than 5 per 0.2 mm.sup.2.
REFERENCES:
A Dictionary of Metallurgy, A. D. Merriman, MacDonald & Evans, Ltd., London: 1958, pp. 126 and 327.
Photocopy of co-pending U.S. application Ser. No. 07/511,944; Apr. 16, 1990, Applicants are E. Usui and M. Kawaguchi.
Dean R.
Kabushiki Kaisha Kobe Seiko Sho
Koehler Robert R.
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