The hot deformation behavior, microstructure and texture evolution of homogenized Mg-9Li-1Zn alloy

In this study, the hot deformation behavior, microstructure and texture evolution of Mg-9Li -1Zn (LZ91) alloy were investigated systematically, and the best Arrhenius hot deformation constitutive equation model and processing map of the LZ91 alloy were developed. Hot compression tests were performed at deformation temperatures and strain rates ranging from 175 degrees C to 275 degrees C and 0.001 s-1to 1 s-1, respectively. The results showed that Arrhenius constitutive equation can predict accurately the hot deformation behavior of LZ91 alloy. The instability areas for this alloy were concentrated in the range of 175 degrees C-220 degrees C, 0.01 s-1-0.1 s-1 and 225 degrees C-260 degrees C, 0.001 s-1-0.002 s-1and 0.02 s-1-1 s-1. The observation of microstructure revealed that the alloy is deformed by the cooperation of the basal slip system and the pyramidal conical slip system. In addition, the hardness which increases in a gradient from the center to the edges is the result of the combined effect of grain refinement and texture. (c) 2023 The Author(s). 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/).

Automated summary

This study systematically investigated the hot deformation behavior, microstructure, and texture evolution of Mg-9Li-1Zn (LZ91) alloy, and developed the best Arrhenius hot deformation constitutive equation model and processing map for the alloy. The results showed that the hot deformation behavior of the LZ91 alloy can be accurately predicted using the Arrhenius constitutive equation. The alloy exhibited instability in specific temperature and strain rate ranges, and the microstructure revealed deformation through the cooperation of different slip systems, resulting in a gradient increase in hardness due to grain refinement and texture.