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Metallurgical Advances for Aluminum Cartridge Case Application,
FRANKFORD ARSENAL PHILADELPHIA PA
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Previous ballistic tests indicated that the acceptance of a small arms, high-performance, aluminum alloy case required the development of aluminum alloy materials with strength and toughness combinations superior to those available in alloys commercially produced. Exploratory tests indicated that, when homogenized to contain less than 0.2 volume percent secondary phases, two new alloys MA56 and MA61 which utilize high purity ingredients had a strength-toughness approaching that considered necessary. At a slightly lower strength level, alloy 7475 was found to have excellent toughness. A novel thermal mechanical treatment was employed to selectively harden the head. This cartridge case was used in conjunction with an invention called a flexible internal element to thwart accidential aluminum case burn-through and successfully demonstrated the flexibility of aluminum cases in high-performance small caliber ammunition. Modified author abstract
APPROVED FOR PUBLIC RELEASE