| METALS AND METAL MATRIX COMPOSITES |
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| Mechanical Responses and Constitutive Modeling of an Extruded WE43 Magnesium Alloy Under High-speed Impact with Different Loading Paths |
| YE Tuo1, QIU Sawei1, XIA Erli1, GUO Pengcheng1,2,*, WU Yuanzhi1, LI Luoxing2,3
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1 School of Intelligent Manufacturing and Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China
2 Research Institute of Hunan University in Chongqing, Hunan University, Chongqing 400044, China
3 State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha 410082, China |
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Abstract The dynamic mechanical behavior of an extruded WE43 magnesium alloy with various heat treatments under different loading paths at room temperature was investigated by split Hopkinson pressure bar and various microscopic characterization methods. The results show that the true stress-true strain curves of the extruded WE43 magnesium alloy feature a ‘C’ shape with a weak anisotropy. Both its yield strength and ultimate strength show positive strain rate sensitivity. Under different loading paths, a lot of deformation twins generate in the studied alloy with diffe-rent heat treatment states, accompanied by a small amount of twin intersections. Although twinning is insensitive to heat treatment and loading path, it can promote the formation of cellular dislocation substructures. When the applied strain rate increases to 4 120 s-1, the density of twins decreases due to adiabatic temperature rise and induced dynamic recovery. Mutual coordination between twinning and non-basal slip is the dominant deformation mechanism of the extruded WE43 magnesium alloy at room temperature. Based on the classical J-C constitutive model, the strain hardening term and the strain rate hardening term were then modified by polynomial functions of strain and strain rate, and the mechanical constitutive functions under different loading paths were established for various heat-treated WE43 magnesium alloys. The deviations between the results of constitutive fitting and experiment were within ±10%, and the correlation coefficient R and the average relative error AARE were 0.952 and 3.28%, respectively.
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Published: 25 October 2024
Online: 2024-11-05
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| Fund:National Natural Science Foundation of China (52201074, 52171115, U20A20275), the Natural Science Foundation of Hunan Province, China (2024JJ5644), and the Natural Science Foundation of Changsha (kq2208420). |
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2024, Vol. 38 
