The effect(s) of trace additions of Zn to the artificial aging behavior of alloy 8090 (Al-Li-Cu-Mg-Zr) was investigated in the approximate composition range 0-1 wt.% Zn. Trace Zn additions were found to delay aging and under equivalent aging treatments (100 hrs at 160 Cel) the alloy without Zn and the 1.07 wt.% Zn alloy developed delta prime-free zones along subgrain boundaries, while the alloys of 0.21 and 0.58 wt.% Zn did not. DSC analysis indicated that Zn was being incorporated into the delta prime, shifting it's exotherm to higher temperatures, while having little of any effect on its associated endotherm making it unlikely that it is an artifact of a solvus shift. In the 8090 + 1.07 wt.% Zn alloy, coarse precipitates were found to reside on subgrain boundaries and EDS indicated that they were rich in Cu and Zn. It was also noted that in the Zn containing 8090 varients, the S' precipitates were more coarse in size than the baseline 8090.
The effect of trace additions of Zn of the precipitation. Behavior of alloy 8090 during artificial aging
Einfluß von Spurenzuschlägen von Zn auf die Kristallisationseigenschaften der 8090 Legierung während des künstlichen Alterns
1991
13 Seiten, 8 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
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