Dynamic Flow Stress and Microstructure Evolution of 6013-T4 Aluminum Alloy at Different Temperatures
TANG Xu1,2, LI Luoxing1,2, YE Tuo1,2, LI Rongqi1,2
1 The State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082; 2 College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082
Abstract: The dynamic compression tests of 6013-T4 aluminum alloy were conducted at the temperatures of 25 ℃, 100 ℃, 200 ℃, 300 ℃ and 400 ℃, at the strain rates of 1 000 s-1, 2 000 s-1, 3 000 s-1, 4 000 s-1 and 5 000 s-1 by split Hopkinson pressure bar (SHPB), the true stress-true strain curves were obtained. The microstructure evolution of dynamic compression test specimens under different test conditions was observed by means of transmission electron microscopy (TEM). Results show that the flow stress of 6013 aluminum alloy has weak sensitivity to the strain rate but strong sensitivity to temperature. The effect of strain rate and temperature on microstructure of 6013 aluminum alloy is remarkable, the dislocation density increased with the increase of strain rate and decreased with the increase of temperature. Based on the experimental data, the constitutive parameters of the Johnson-Cook model of 6013 aluminum alloy were obtained and the constitutive model was built. The constitutive model can well predict the flow stress of 6013 aluminum alloy compared with the experimental results.
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2017, Vol. 31 
