Application of High Strength Aluminum Casting

摘要

The mechanical properties of aluminum castings can be im¬proved through careful control of foundry variables, particularly iron contamination, process variations and specialized heat treat¬ment. These principles have been applied to the casting of two specific ordnance components, namely, the sight bracket and the yoke of the 81 mm Mortar.nThe processes utilized in this investigation are the perma¬nent mold technique, employing an anodized aluminum mold, and chilled shell molding, employing aluminum chills to effect local¬ized rapid solidification. With the former, tensile properties of 47,000 psi TS, 32,400 psi YS and 7% elongation have been realized for the sight bracket whereas with the latter properties of 44,000 psi tensile: 37,000 psi yield: 10% elongation have been ob¬tained in the yoke. In addition, through variations in heat treat¬ment, properties in excess of 60,000 psi TS and 50,000 YS, but with negligible ductility have been possible.