Cast aluminum bronzes containing 8.5 to 12.9%Al, 3.9 to 4.3%Fe, 3.9 to 4.8%Ni and 1.0 to 1.2%Mn were heated at 1,020°C and cooled at various rates. Some of them were followed by tempering at 600 to 700°C. Aggresive dealloying corrosion occurs in the bronzes of
β'and/or
γ2 phases. The solute element distribution in the dealloyed region changes corresponding to the microstructure. The resistance to dealloying corrosion of the bronzes containing Al above 9.5% is improved by tempering, but is inferior to that of the bronzes containing Al below 9.5%. The saturation magnetization increases by precipitation of Fe-rich
κ2 and/or
κ4 phases. The corrosion of aluminum bronzes is may be estimative by measuring magnetic properties.
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