ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The plastic deformation behaviors of 7050 Al alloy were investigated by compression testsat temperatures ranging of 250°C[removed info]450°C under constant strain rates of 0.01s−1, 1s−1 and 10s−1. Theresults showed that all the flow curves consisted of three stages, i.e. strain-hardening, strain-softeningand steady state-strain. Initially, the stress rises steeply at microstrain deformation, and then increasesat a decreased rate, followed by a strain-softening until a steady state stress. The stress level decreaseswith increasing deformation temperature and decreasing strain rate, which can be represented by aZener-Hollomon parameter in an exponent-type equation,1 19 7.202 σ p 80.71 sinh (1.64 10 Z)= ⋅ − × − ⋅ − .Elongated grains with serrations developed in the grain boundaries were observed; the dynamicrecrystallization (DRX) occurs with increasing temperature and dislocation density, and the shape ofgrain at steady state is nearly equiaxial. It can be concluded that the DRX phenomenon is sensitive tothe temperature and the dynamic flow softening is mainly as the result of dynamic recovery and DRX
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1065.pdf
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