ENGINEERING TECHNOLOGY

New progress has been made in the study of the deformation mechanism of pre-twin magnesium alloys


As a “21st century green engineering material”, magnesium alloy is widely used in weapons, aerospace and transportation. How to improve the impact resistance of magnesium alloys in various harsh service environments such as explosion and impact, and analyze the deformation mechanism of pre-twin magnesium alloys under high-speed impact loads have important research value.

The reporter learned from Hunan University of Science and Technology on July 7 that the team of Liu Xiao, the doctoral supervisor of the university, obtained a pre-twin magnesium alloy with a mainly {10-12} stretched twin crystal through rolling deformation, and conducted Hopkinson impact experiments on the pre-twin crystal magnesium alloy, and studied the deformation mechanism of the pre-twin magnesium alloy under medium and high temperature high-speed impact load.

Studies have shown that the mechanical response of materials is related to the competition between shear belt strengthening, twin crystal strengthening and fine crystal strengthening, and relies on the main microstructure. During the medium and high temperature high-speed impact process of pre-twin magnesium alloy, pre-twin crystal is conducive to inducing tensile/compressive twins, base surface and non-base surface slip; Most grains are beneficial for generating compression/twin crystals, base and non-base slips. At relatively low temperatures, high-speed impact deformation is achieved by coordinating twins and dislocation slip at the beginning of deformation and the generation of deformation shear belts at a later stage of deformation. At relatively high temperatures, high-speed impact deformation is achieved through the coordination of twins and dislocation slip at the beginning of deformation, the generation of transition shear bands in the middle of deformation and the dynamic recrystallization of the grain boundary and twin crystal boundary in the late stage of deformation.

Liu Xiao’s team has made new progress in the research on the deformation mechanism of pre-twin crystal magnesium alloys. Courtesy of respondents

These results were recently published in the Journal of Magnesium and Alloys. The research was funded by the National Natural Science Foundation of China, the Natural Science Foundation of Hunan Province, and the Open Platform Fund of Hunan Institute of Technology. (Source: China Science Daily Wang Haohao)

Related paper information:https://doi.org/10.1016/j.jma.2021.07.030



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