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学者姓名：张晓丹
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Abstract ：
The high-entropy alloys (HEAs) primarily composed of elements such as Ti, Zr, Hf, and Nb generally exhibit a B2-type crystal structure, contributing to their enhanced strength. However, the limited ability of the B2 lattice structure to accommodate plastic deformation leads to poor plasticity in this type of alloys. The deformation-induced martensitic transformation (DIMT) occurring in the B2 lattice can effectively alleviate the poor plasticity associated with these alloys. Our work focuses on the previously reported Ti49Zr20Hf15Al10Nb6 high-entropy alloy with DIMT mechanism, employing an improved elastic visco-plastic self-consistent (EVPSC) model to predict and analyze the macro-and micro-mechanical responses during uniaxial tension and cyclic loading that includes loading, unloading, and reloading. The model results elucidate the stress-strain behavior and volume fraction evolution of the beta parent phase and alpha(y) martensite phase during tension and cyclic loading, while quantitatively assessing the contributions of transformation and dislocation mechanisms to plastic deformation. Additionally, it explores the influence of back stress-a topic that is rarely addressed-on the reverse process of martensitic transformation and recoverable strain in this high-entropy alloy at the micro-structural level. This model serves as a theoretical analysis tool for HEAs that incorporate reversible phase transformation (RPT) mechanism, facilitating the understanding of the evolutionary processes governing mechanical behavior at the microstructural level and thereby guiding the enhancement of toughness in B2 lattice HEAs.
Keyword ：
Back stress Back stress Crystal plasticity Crystal plasticity High-entropy alloys High-entropy alloys Martensitic transformation Martensitic transformation Mechanism evolution Mechanism evolution Recoverable strain Recoverable strain
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| GB/T 7714 | Liu, Chuhao , Sun, Xiaochuan , Zhang, Xiaodan et al. A crystal plasticity-based reversible phase transformation model for Ti49Zr20Hf15Al10Nb6 high-entropy alloy [J]. | ACTA MATERIALIA , 2025 , 296 . |
| MLA | Liu, Chuhao et al. "A crystal plasticity-based reversible phase transformation model for Ti49Zr20Hf15Al10Nb6 high-entropy alloy" . | ACTA MATERIALIA 296 (2025) . |
| APA | Liu, Chuhao , Sun, Xiaochuan , Zhang, Xiaodan , Zhong, Shengyi , Wu, Yubin , Liaw, Peter et al. A crystal plasticity-based reversible phase transformation model for Ti49Zr20Hf15Al10Nb6 high-entropy alloy . | ACTA MATERIALIA , 2025 , 296 . |
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Abstract ：
The microscopic-deformation mechanisms of an extruded magnesium alloy with and without precipitates [Guinier-Preston (GP) zones] subjected to cyclic deformation were investigated by in-situ neutron-diffraction (ND) measurements and crystal-plasticity modeling. The relationship between the macroscopic-cyclic-deformation behavior and the microscopic responses (particularly twinning and detwinning) at the grain level was established. The general deformation-mechanism evolution in the solution-state (ST) sample was similar to that in the peak-aged-state (PA) sample over fatigue cycles. Both samples plastically deformed by extension twinning during compression, and by a sequential process of detwinning and dislocation motion under reverse tension. The main difference is that in the PA sample, the presence of precipitating particles constrains the twinning/detwinning behaviors, which leads to an increase in the participation of dislocation slip in the plastic deformation and then induces a strengthening effect during cyclic loading. Based on the combination of the previous in-situ ND results and crystal-plasticity model, our work provides a comprehensive analysis of the interaction between the precipitation strengthening and twinning/detwinning mechanism under the whole multi-cycle cyclic loading and their effect on the macro- and micro-mechanical behavior of the precipitate-strengthened magnesium alloys. © 2024
Keyword ：
Crystal plasticity Crystal plasticity Cyclic deformation Cyclic deformation In-situ neutron diffraction In-situ neutron diffraction Lattice strain Lattice strain Magnesium alloy Magnesium alloy Mechanism evolution Mechanism evolution Precipitation strengthening Precipitation strengthening
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| GB/T 7714 | Liu, C. , Xie, D. , Gao, Y. et al. Precipitation-strengthened micromechanical behaviors of magnesium alloy under cyclic loading [J]. | Journal of Magnesium and Alloys , 2024 . |
| MLA | Liu, C. et al. "Precipitation-strengthened micromechanical behaviors of magnesium alloy under cyclic loading" . | Journal of Magnesium and Alloys (2024) . |
| APA | Liu, C. , Xie, D. , Gao, Y. , Zhang, X. , Zhong, S. , Wang, H. et al. Precipitation-strengthened micromechanical behaviors of magnesium alloy under cyclic loading . | Journal of Magnesium and Alloys , 2024 . |
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