Abstract
In this paper, the hot workability of Mg-1Li-1Al (LA11) alloy is assessed through a uniaxial compression test in a temperature range from 200 to 400 °C and a strain rate, έ, of 1–0.01 s−1. The present study reveals that flow stress increases when the strain rate increases and deformation temperature decreases. Based on the hyperbolic sine equation, the flow stress constitutive equation of this alloy under high-temperature deformation is established. The average activation energy was 116.5 kJ/mol. Avrami equation was employed to investigate the dynamic recrystallization (DRX). The DRX mechanism affected by the deformation conditions and Zener–Hollomon parameters is revealed. Finally, the relationship between DRX volume fraction and deformation parameter is verified based on microstructure evolution, which is consistent with the theoretical prediction.
Highlights
Recrystallization of Mg-1Li-1Al Alloy.Magnesium (Mg) alloys are ideal for transportation and aerospace industries due to their low density, high specific strength, high specific stiffness and good damping capacity [1,2]
LA11 alloy has a coarse structure with an average grain size of 352 ± 3 μm
It has been reported that the DRX mechanism and microstructure evolutions duri the hot deformation process are closely associated with grain orientation, grain bounda energy, and dislocation activity, which are affected by deformation temperature
Summary
The Li element is found to be effective in decreasing the axial ratio of the Mg lattice, which would activate more slip systems, and improve the ductility of the magnesium alloy as well [7,8]. Due to the low basal stacking fault energy during high-temperature deformation of Mg-Li alloys, the dynamic recrystallization (DRX) process occurs, which has an obvious influence on the microstructure and mechanical properties [3,14,15]. Investigated the hot compression deformation behavior of an AZ61 magnesium alloy They applied the hyperbolic sine equation to find the constitutive model, and the average apparent Q-value was determined to be 173.66 kJ/mol. The constitutive equation of high-temperature flow behavior and a DRX kinetics model of an LA11 alloy during hot deformation were established, and the rheological softening behavior at high temperatures was predicted. The performance of DRX was further analyzed
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