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The forming behavior of Al-Cu-Mg-Mn alloy 2024 sheets with fine, equiaxed and coarse, elongated grain structures was characterized in the O temper (fully annealed) and W temper (solution heat treated and quenched) conditions. The fine grained materials had better biaxial stretching capabilities in both tempers. The fine grained O temper also had superior drawing and plane strain stretching properties. For the O temper, conventional tensile forming indicators such as elongation and strain ratio, correlated with ball punch depth, forming limit strains and limiting draw ratio. Such correlations were not apparent in the W temper, however, nor could the two tempers be compared on the basis of tensile data alone.

Before aluminum can be used in automotive radiators and heater cores, assurances are required that corrosion performance will be satisfactory. Accelerated laboratory glassware tests, however, indicate that conventional aluminum brazing sheet materials may not be suitable under service conditions unless significant improvements are made in corrosion resistance and/or coolant inhibition. Although corrosion performance can be greatly improved by utilizing an inner anodic cladding alloy (Alclad concept), fabricating and manufacturing processes would be simplified by using a conventional product in a properly inhibited cooling system.