Development of Low Cost, High Performance AlZn4.5Mg1 Alloy 7020
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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This paper describes properties, processing, and performance of Al-Zn-Mg alloy 7020 for armor and commercial applications. Comparisons are made with alternative aluminum armors chemistry, properties, levels of strength and ductility, weld properties, and resistance to stress and exfoliation corrosion. The advantages for development and optimization of alloy 7020 for vehicle armor or welded structures are identified to be 1 low thermal sensitivity of the microstructure and mechanical properties to deleterious effects from reheat or solution-treatment and air-quench, 2 low Zn-Mg alloy and production costs, 3 adequate thick-plate strength and ductility for ballistic protection, and 4 high levels of weld strength and ductility in the natural or artificial aged condition. Concerns include 1 optimizing thickness-dependent combinations of strength, toughness, and armor-threat-protection and 2 optimizing processing and manufacturing techniques for mechanical properties and durability against stress and exfoliation corrosion.
- Properties of Metals and Alloys