Journal
MATERIALS TRANSACTIONS
Volume 61, Issue 11, Pages 2101-2106Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MT-M2020157
Keywords
magnesium-lithium alloy; hot deformation; Zener-Hollomon parameter; activation energy; dynamic recrystallization
Funding
- project Chiiki sangyo kasseika jinzai ikusei shien jigyo of the National Institute of Advanced Industrial Science and Technology (AIST)
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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 473-673K at strain rates of 1 (c) 10(-1)-1 (c) 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.
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