Abstract
The effect of microadditions of Er and Zr on the changes in the structure of aluminum alloy 7075 under homogenization is studied. The additions of Er and Zr cause grain refinement and lower the size of the coarse nonequilibrium grain-boundary eutectic. The eutectic dissolves completely in the homogenization process; the long rods transform into spherical particles. The mode of the homogenization affects substantially the precipitation of the secondary Al 3 (Er, Zr) phase. Two-stage homogenization (400°C, 12 h + 465°C, 12 h) yields fine and uniformly distributed particles of Al 3 (Er, Zr) with a mean radius of 28.9 nm and a volume fraction of 1.3 × 10 - 3 .
Published Version
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