Abstract
Electron microscopy and electrical resistivity measurements have been employed to investigate the effect of quenching rates on alloys with a base composition of Al-Zn 5.5 pct-Mg 2.5 pct-Cu 1.6 pct with minor additions of chromium and zirconium, and without other elements. The results show that the loss of aging capability, measured in terms of G.P. zone density, observed after a slow quenching, is to be ascribed to the loss of solute occurring by the formation of large η particles during cooling; therefore, other mechanisms are not required to account for the quench sensitivity of these alloys. In addition, a semiquantitative relation between high temperature dispersoids and coarse η particles formed during slow quenching has been obtained, bringing new evidence that the different nucleant effect of chromium-rich particles with respect to those containing zirconium is of qualitative character.
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Conserva, M., Fiorini, P. Interpretation of quench-sensitivity in Al-Zn-Mg-Cu Alloys. Metall Trans 4, 857–862 (1973). https://doi.org/10.1007/BF02643097
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DOI: https://doi.org/10.1007/BF02643097