Abstract
AbstractSpecial alloying elements are added to high-strength Al-Zn-Mg- (Cu) alloys to prevent them from recrystallizing during fabrication. Because chromium, which is commonly used for this purpose, has the disadvantage of increasing the quench sensitivity of these alloys (lower strength for given section thicknesses and aging treatments), considerable attention has recently been given to using zirconium instead. Data are presented showing the relative merits of chromium and zirconium in an AA7049-type alloy (nominally 7.7% Zn, 2.5% Mg, 1.5% Cu). Although zirconium greatly reduces the degree of quench sensitivity relative to chromium, short-transverse stress corrosion resistance (SCR) is greatly sacrificed for a given aging treatment. However, stress corrosion resistance can be improved by extended overaging, and for slow quench rates (as in heavy section thicknesses) favourable combinations of strength and SCR are attainable that are not possible in Cr-containing alloys. Resume Certains elements d'additi...
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