Metal treatment – Compositions – Heat treating
Patent
1988-07-11
1990-11-27
Dean, R.
Metal treatment
Compositions
Heat treating
148417, 148439, C22F 104
Patent
active
049733630
ABSTRACT:
The present invention is related to an aluminum alloy having an improved workability and mechanical characteristics such as shear cutting ability, a high strength and a high abrasion resistance. The present invention is also related to a method for making the above-mentioned alloy.
There is provided by the present invention an aluminum alloy having an improved shear cutting characteristics comprising; from 8 to 13 weight percent of silicon, from 2.5 to 6 weight percent of copper, from 0.3 to 1.2 weight percent of magnesium, from 0.25 to 1.0 total weight percent of iron and/or manganese, from 0.005 to 0.25 total weight percent of titanium and boron, and the balance consisting of aluminum and impurities, whereby more than 80 percent of an arbitrary sectional surface is covered by equi-axial crystal, silicon crystal in aluminum-silicon eutectic structure is 8 .mu.m at most in diameter, and surface hardness is between 67 and 75 according to the Rockwell hardness scale F.
There is also provide by the present invention a method for making an aluminum alloy having an improved shear cutting characteristics, the method comprising the steps of: (a) preparing a molten raw material including from 8 to 13 weight percent of silicon, from 2.5 to 6.0 weight percent of copper, from 0.3 to 1.2 weight percent of magnesium, from 0.25 to 1.0 weight percent of iron and/or manganese, from 0.005 to 0.25 total weight percent of titanium and boron, and aluminum filling the rest together with impurities; (b) casting the molten raw material at a solidification speed not less than 4.degree. C./sec to a temperatue lower than a solidfying temperature of the material so that more than 80 percent of arbitrary sectional surface is covered by equi-axial cristal and a silicon crystal in aluminum-silicon eutectic structure is 8 .mu.m at most in diameter; and (c) heat treating the material so that a hardness thereof becomes between 67 and 75 according to the Rockwell hardness scale F.
REFERENCES:
patent: 4648918 (1987-03-01), Asano et al.
Hayato Ikeda
Katsumi Yokoi
Kenji Suzuki
Tunehisa Sekiguchi
Dean R.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Showa Denko Kabushiki Kaisha
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