Hot Compression Behavior of Mg–14Li–6Al–1Ca Alloy

抄録

The hot deformation behavior of a Mg–14Li–6Al–1Ca alloy was studied using the hot compression true stress–strain curves corresponding to the temperature range of 473–673 K at strain rates of 1 × 10⁻¹–1 × 10⁻³ s⁻¹. The true stress–strain curves indicated dynamic softening under the test conditions. The peak stress during deformation could be correlated with the temperature and strain rate using a hyperbolic-sine equation. The activation energy of the Mg–14Li–6Al–1Ca alloy was determined to be 193 kJ mol⁻¹. The Zener-Hollomon parameter (Z) for the Mg–14Li–6Al–1Ca alloy was determined. The tendency for dynamic recrystallization increases at low strain rates and high temperatures, corresponding to low Z values. The hot deformation behavior of the Mg–14Li–6Al–1Ca alloy was modelled by a suitable constitutive equation. Furthermore, the size of the equiaxed grains in the hot-deformed and quenched specimens was estimated from the Z value.