The hot deformability of 2519 aluminium alloy under elevated temperatures was studied by the analysis of true stress strain curves and observation of the deformed microstructures with an optical microscope (OM) and a transmission electron microscope (TEM). Compression tests were performed on a Gleeble-1500 thermal simulator at the deformation temperature range from 300 degrees Celcius to 500 degrees Celcius and at a strain rate range of 0.05 s(exp-1). The experimental results showed that the flow stress of 2519 aluminium alloy increases with increasing strain and tends to be constant after a peak at lower strain rates of (epsilon < 25 s(exp-1)), and a dynamic recovered substructure was observed with TEM. The flow stress sawtooth pattern fluctuated and decreased after a peak value with increasing strain and higher strain rates of (epsilon > = 25 s-1), which was associated with a dynamic recrystallization revealed by OM and TEM. Flow softening was due to dynamic precipitate coalescence and not to dynamic recrystallization at elevated temperature and lower strain rate. A hyperbolic sine relationship correlated well for fitting the flow stress as a function of strain rate, and an Arrhenius relationship related temperature and time of dynamic recrystallization. The flow stress of 2519 aluminium alloy during high temperature deformation and time of dynamic recrystallization can be determined from the Zener-Hollomon parameter including the hot deformatioon acitivation energy of 2519 aluminium alloy, which was calculated to be 167,81 KJ/mol from the Arrhenius equation.
A study on the hot deformability of 2519 aluminum alloy at elevated temperatures
Light Metal Age ; 65 , 5 ; 46-49
2007
4 Seiten, 6 Bilder, 9 Quellen
Article (Journal)
English
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