AFS Library

EFFECT OF SECTION THICKNESS ON THE TENSILE PROPERTIES OF THIN- SECTION ALUMINUM ALLOY SAND CASTINGS 69-32

19690852
Journal: AFS Transactions 1969, p. 192-197 Modern Casting (Oct. 1969), p. 192-197
Author: S. Lipson and F. Ripkin

A study of the strength characteristics of thin-section aluminum sand castings was conducted. A special test pattern was designed which contained 6 small test plates disposed around a central hub. The plate thicknesses covered a nominal range from 0.040 to 0.200 in. thick. The castings were counter-gravity poured using a previously described apparatus and data was collected on magnesium-silicide alloys, as well as compositions which are representative of the Al-Cu, Al-Mg and Al-Mg-Zn class of alloys. It was found that of the alloys tested, the ones most suitable for thin-section castings were A356 and 355. The most important conclusions are that the properties of thin-section A356 alloy castings are such that the strength and ductility levels can generally meet the requirements for premium quality castings as defined in Military Specification MIL-A-21180-C.



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