Abstract
High-temperature tests were conducted to investigate the tensile behaviors of Mg–xAl (x = 2, 3, 4, 6, 9 wt%) alloys. The mechanisms of deformation were investigated by analyzing the microstructures, stress exponents and deformation activation energy values. The results show that with the increase in the temperature and the decrease in the logarithmic strain rate, the mechanism of deformation of the Mg–xAl alloys changes from dislocation climb creep to solute drag creep, differing from the pure Mg that is consistently controlled by dislocation climb creep. Three regions are classified based on the stress exponents of the Mg–xAl alloys, and it is found that the stress exponent decreases with the increase in the Al content in each region. The Mg–xAl alloys exhibit enhanced tensile ductility of greater than 100% at 450 °C and 1 × 10−3 s−1, which is attributed to the solute-drag creep with a lower stress exponent.
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