| 摘要 |
PROBLEM TO BE SOLVED: To produce a free-cutting aluminum alloy having excellent machinability without the addition of lead and to provide a method for producing the alloy material thereof. SOLUTION: This free-cutting aluminum alloy contains, as essential components, by weight, 5.1 to 6.0% Cu, 1.0 to 10.0% Si and 0.001 to 1.0% Sr, and the balance Al with impurities. Moreover, in addition to the above essential components, at least one kind of Mg and Mn is added. Furthermore, the free- cutting aluminum alloy material is produced by subjecting a billet composed of the above free-cutting aluminum alloy to homogeneous treatment at 200 to 545 deg.C, extruding this billet at an extrusion temperature of 300 to 500 deg.C at an extrusion product rate of >=5 m/min, moreover drawing the same at a reduction of >=5%, thereafter executing solution treatment at 300 to 545 deg.C, furthermore subjecting the same to natural aging treatment for >=1 hr and executing artificial aging treatment at 100 to 250 deg.C for 1 to 30 hr.
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