AGING ALUMINUM ALLOY 7085 MOLD BLOCKS Part Ⅱ: CONTINUOUS NON-ISOTHERMAL AGING

摘要

The acceptance of alloy 7085 by the polymer injection molding industry led to increased demands on the aging furnaces at Alcoa's Cleveland Works, so they asked us to develop an even shorter aging practice. We explored the feasibility of combining the stage that nucleates GP zones with the stage that transforms them into η' and η precipitate. We determined the heating rate that allowed GP zones to grow continuously at a rate sufficient to prevent reversion as the temperature increased. We also determined that the kinetics of overaging 7085 during continuous aging could be predicted by integrating effects of isothermal overaging.