Two alloys based on Al-Zn-Mg (Zr), were characterized from microstructural and mechanical points of view. Hot tensile tests and torsion test on as-cast samples were performed. Deformed samples exhibit some static recrystallization (SRX) more evident in the alloy without Zr. As-cast alloys hot deformed by tension exhibits considerable cavitation that increases with temperature (T) . The analysis of this phenomena on 7000 as cast alloy has shown that cavity growth is mainly controlled by plastic strain both at 250°C and 400°C even if grain boundary sliding (GBS) contributes to enhance the fraction of cavities at the highest T . Cavitation is reduced if the alloy is solutionized before deformation.
PROPERTIES, MICROSTRUCTURE AND HOT DEFORMATIONBEHAVIOUR OF DIFFERENT Al-Zn-Mg (Zr) ALLOYS.
LEO, PAOLA;CERRI, Emanuela;
2012-01-01
Abstract
Two alloys based on Al-Zn-Mg (Zr), were characterized from microstructural and mechanical points of view. Hot tensile tests and torsion test on as-cast samples were performed. Deformed samples exhibit some static recrystallization (SRX) more evident in the alloy without Zr. As-cast alloys hot deformed by tension exhibits considerable cavitation that increases with temperature (T) . The analysis of this phenomena on 7000 as cast alloy has shown that cavity growth is mainly controlled by plastic strain both at 250°C and 400°C even if grain boundary sliding (GBS) contributes to enhance the fraction of cavities at the highest T . Cavitation is reduced if the alloy is solutionized before deformation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
