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EnglishThis paper studies the high temperature mechanical properties of as-cast Al–Zn–Mg using tensile and creep testing. Hot tensile tests were performed in the temperature and strain rate ranges of 350–400 ◦C and 10−5 to 10−3 s−1 respectively. Creep tests were carried out under constant load with initial stress ranging from 5 to 22 MPa, at 350 and 400 ◦C. The alloy exhibits class A creep behavior, due to the viscous glide of dislocations. The tensile flow curves, corrected to account for the effect of sample elongation on strain rate, also show a decline in stress commonly observed in Al–Mg alloys. The highest ductility and strain rate sensitivity were both observed for strain rates ranging from 10−5 to 10−4 s−1. During hot deformation the alloy exhibits cavitation which increases with temperature. The analysis of these phenomena has shown that cavity growth is mainly controlled by plastic strain.
| Titolo: | High temperature mechanical properties of an aluminium alloy containing Zn and Mg |
| Autori: | |
| Data di pubblicazione: | 2012 |
| Rivista: | |
| Abstract: | This paper studies the high temperature mechanical properties of as-cast Al–Zn–Mg using tensile and creep testing. Hot tensile tests were performed in the temperature and strain rate ranges of 350–400 ◦C and 10−5 to 10−3 s−1 respectively. Creep tests were carried out under constant load with initial stress ranging from 5 to 22 MPa, at 350 and 400 ◦C. The alloy exhibits class A creep behavior, due to the viscous glide of dislocations. The tensile flow curves, corrected to account for the effect of sample elongation on strain rate, also show a decline in stress commonly observed in Al–Mg alloys. The highest ductility and strain rate sensitivity were both observed for strain rates ranging from 10−5 to 10−4 s−1. During hot deformation the alloy exhibits cavitation which increases with temperature. The analysis of these phenomena has shown that cavity growth is mainly controlled by plastic strain. |
| Handle: | http://hdl.handle.net/11587/366190 |
| Appare nelle tipologie: | Articolo pubblicato su Rivista |
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