Aluminum alloy of excellent machinability and manufacturing meth

Details Aluminum alloy of excellent machinability and manufacturing meth Aluminum alloy of excellent machinability and manufacturing meth

1997-06-23

2000-05-09

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148417, 148439, 148440, 420534, 420546, C22C 2102

Patent

active

060599022

ABSTRACT:
An aluminum alloy containing Si: 1.5-12% (mass % here and hereinafter), Mg: 0.5-6% and, optionally, at least one of Mn: 0.5-2%, Cu: 0.15-3% and Cr: 0.04-0.35% and, further, containing Ti: 0.01-0.1% and the balance of Al and inevitable impurities, in which the average grain size of crystallized grains of Si system compounds is from 2 to 20 .mu.m and an area ratio thereof is from 2 to 12%. The alloy is melted to obtain a cast ingot having DAS (Dendrite Arm Spacing) of 10 to 50 .mu.m, which is then put to a soaking treatment at 450 to 520.degree. C. and then to extrusion molding. The aluminum alloy has excellent machinability with no addition of low melting metals.

REFERENCES:
patent: 3841919 (1974-10-01), Hasegawa et al.
patent: 5223050 (1993-06-01), Bryant et al.
patent: 5523050 (1996-06-01), Lloyd et al.

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