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Effect of retrogression and re-aging heat treatment on microstructure and mechanical properties of Al-Zn-Mg-cu-Zr-Sc alloy
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DOI：10.1016/j.matlet.2026.141242.png)
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Abstract
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• Effects of RRA on Sc-modified AA7050 alloy were systematically investigated. • ScZr addition produced a refined equiaxed grain structure. • η' precipitates coarsened from ∼5 nm (T6) to ∼15 nm after RRA. • RRA retained ∼590 MPa yield strength and increased conductivity to 36% IACS. • Modified grain boundary precipitation after RRA may favour SCC resistance.
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