Dynamic compressive behaviour and microstructural evolution of extrusion-shear deformed ZC61 alloy

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Herein, an Mg–6Zn–2Ce–0.6Zr alloy was prepared via the extrusion–shear process. The dynamic compression mechanical performance and mechanism of microstructural evolution of the alloy in a strain rate range from 500 to 2500 s−1 were investigated. The dynamic compression performance of the alloy increased with the strain rate. The electron backscatter diffraction analyses revealed that the angle between the c-axis and the extrusion direction of most grains changed from 90° to 180° after dynamic compression. The deformation can be attributed to the extension twining, basal slip, and prismatic slip. The dynamic deformation mechanism was studied and the fracture mechanism under a high strain rate was determined by analysing the temperature rise and absorbed energy density.

Section: Discussionmentioning

confidence: 99%

Dynamic compression behaviour and microstructural evolution of the Mg–6Zn–2Ce–0.6Zr alloy

Wang

et al. 2023

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“…Magnesium alloys are widely used in automobiles and other industries due to their excellent characteristics. These are lightweight, easily processed, and show excellent dimensional stability [1][2][3][4][5]. As a structural material, magnesium alloys inevitably have to withstand high strain rates loading deformation in the actual application process [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic compression behaviour and constitutive description of fine-grain Mg–4Zn–1Y alloy

Liu

Mao

et al. 2022

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In this research, the dynamic compression behaviour of 5 and 1.5 µm grain size samples of Mg–4Zn–1Y alloy was investigated by the split Hopkinson pressure bar at the strain rate of 1000–1700 s−1. The microstructure, texture evolution, and the deformation mechanisms of samples were characterised by electron backscattering diffraction. The result showed that the grain refinement caused tension twining, which resulted in the distinct true stress–strain curves with specific grain sizes. It was found that the pyramidal < c + a > and pyramidal <a > slips were the main deformation mechanisms of 5 and 1.5 µm samples under dynamic compression, respectively. The constitutive modelling of Mg–4Zn–1Y with different grain sizes was also developed by introducing the grain size adjustment parameters.

“…In particular, in the automotive industry [1][2][3], Mg alloys are preferably used as lightweight parts of automobiles, in the front, side, and rear of the car [4]. When the collision accidents, such as frontal impact and rear-end impact occur, the parts made out of Mg alloy at these positions get subjected to impact loads with higher strain rates [5]. Notably, the mechanical properties and starting deformation mechanism under this condition are different from those under static or quasi-static conditions [6,7].…”

Section: Introductionmentioning

confidence: 99%

Interactions between twins and dislocations in ZK60 alloy under dynamic compression

Zhou

et al. 2022

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The interactions between [Formula: see text] tension twins and dislocations of ZK60 alloy under dynamic compression were investigated by electron backscattering diffraction and transmission electron microscopy. The samples were divided into two groups, where group-1 experienced primary deformation with different strains (4, 6, 9, and 12%) and group-2 experienced secondary deformation based on the primary deformation (4% + 8%, 6% + 6%, 9% + 3%) to reach the final deformation of 12%. The results reveal that the [Formula: see text] tension twins are the dominant deformation mechanism during the early stages of deformation, and the volume fraction of [Formula: see text] tension twins and dislocation density increase with the increase in deformation. Moreover, the twin boundaries and dislocations generated during the primary deformation become the resistance to the dislocations motion during the secondary deformation.