The effect of solidification microstructure on the corrosion behavior of a columnar aluminum-copper alloy |
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Authors: | Y V V R S Murty T Z Kattamis O F Devereux |
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Affiliation: | (1) Department of Metallurgy, Institute of Materials Science, University of Connecticut, 06268 Storrs, Conn. |
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Abstract: | The morphological and kinetic nature of corrosion of directionally solidified aluminum-4.5 wt pct copper alloy in the as-cast,
solutionized and solutionized-and-aged conditions in air-saturated aqueous 3.5 wt pct NaCl solution were evaluated. In the
solutionized and solutionized-and-aged conditions the intergranular attack and pitting are similar to those occurring in solutionized
wrought alloys; the extent of attack at long times increases with increasing severity of solidification rate. The as-cast
alloy exhibits a cored dendritic structure with significant formation of interdendritic nonequilibrium eutectic. Extensive
inter dendritic corrosion of the α-phase containing more than 3.2 wt pct copper is seen; α containing less than 3.2 wt pct
copper and the θ-Al2Cu phase are cathodic. Corrosion of the as-cast alloy is parabolic with time and increases with increasing severity of solidification
rate in proportion to the amount of nonequilibrium second phase. |
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