Journal
MATERIALS
Volume 7, Issue 1, Pages 244-264Publisher
MDPI AG
DOI: 10.3390/ma7010244
Keywords
Al-Zn-Mg-Cu alloy; hot compression; microstructure; decline ratio map; flow stress; dynamic softening mechanism
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Rio Tinto Alcan through the NSERC Industrial Research Chair in Metallurgy of Aluminum Transformation at the University of Quebec at Chicoutimi
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The hot deformation behavior and microstructural evolution of an Al-Zn-Mg-Cu (7150) alloy was studied during hot compression at various temperatures (300 to 450 degrees C) and strain rates (0.001 to 10 s(-1)). A decline ratio map of flow stresses was proposed and divided into five deformation domains, in which the flow stress behavior was correlated with different microstructures and dynamic softening mechanisms. The results reveal that the dynamic recovery is the sole softening mechanism at temperatures of 300 to 400 degrees C with various strain rates and at temperatures of 400 to 450 degrees C with strain rates between 1 and 10 s(-1). The level of dynamic recovery increases with increasing temperature and with decreasing strain rate. At the high deformation temperature of 450 degrees C with strain rates of 0.001 to 0.1 s(-1), a partially recrystallized microstructure was observed, and the dynamic recrystallization (DRX) provided an alternative softening mechanism. Two kinds of DRX might operate at the high temperature, in which discontinuous dynamic recrystallization was involved at higher strain rates and continuous dynamic recrystallization was implied at lower strain rates.
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