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The toughness of wrought, high-strength aluminum alloys is related to the amount, type, and morphology of coarse (larger than about 1 μm) constituent particles, intermediate size (about 0.02 to 0.5 µm) dispersoids, and fine (down to about 0.001 µm) precipitates. High toughness can be attained by minimizing the size and volume fraction of constituent particles, increasing the interdispersoid distance, refining the intragranular precipitate in 2XXX alloys, and controlling the intergranular precipitate in 7XXX alloys. For highest toughness in 7XXX alloy products where low residual stress is desired, rapid quenching followed by the minimum amount of cold work required for mechanical stress relief is recommended.
wrought aluminum alloys, fracture properties, toughness, notch sensitivity, tear tests, metallurgical constituents, precipitates, crack propagation
Section head, Physical Metallurgy Division, Alcoa Laboratories, Alcoa Technical Center, Alcoa Center, Pa.