Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 25, Issue -, Pages 5159-5173Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2023.07.004
Keywords
Twinning; Hardening rate; Grain refinement; Dynamic recrystallization; Texture
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The characteristics of twins, dynamic recrystallization, and texture evolution were investigated in a solution AZ80 Mg alloy under different hot deformation conditions. The results showed that twins played a significant role in the microstructure and mechanical response, and led to specific texture evolution.
The characteristics of twins, dynamic recrystallization (DRX), and texture evolution of as -solution AZ80 Mg alloy at different strains, strain rates and temperatures during hot deformation were investigated by EBSD analysis systematically. The activation of twin variants, their interactions, and their role in microstructure and mechanical response are emphasized. The results show that: a large number of {10-12} tension twins and a twin cross structure containing three types of twin-twin boundaries (TTBs) were formed at a strain of 0.10, a strain rate of 0.1 s-1, and a temperature of 300 degrees C. Meanwhile, the original grain is subdivided by high-angle boundaries (HAGBs) converted from twin boundaries (TBs), and the flow stress curve exhibits a feature of concave curvature at a higher strain rate and a lower temperature. As the strain increases, the dominant DRX mechanism is converted from continuous DRX (CDRX) to discontinuous DRX (DDRX) after peak stress, while particle stimulation nucleation (PSN) occurs throughout the process. The strong base texture is weakened by twinning and DRX, where twinning deviates from the parent grain by 86 degrees and DDRX grains deviate from the parent grain by 5 degrees-20 degrees. The diagram of re-lationships between flow stress and microstructure evolution and texture is established.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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