Atomic-resolution studies on reactions between basal dislocations and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si88.svg"><mml:mrow><mml:mo>{</mml:mo><mml:mrow><mml:mn>10</mml:mn><mml:mover accent="false"><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover></mml:mrow><mml:mn>2</mml:mn><mml:mo>}</mml:mo></mml:mrow></mml:math> coherent twin boundaries in a Mg alloy

Su, Huhu; Zhou, Xinzhe; Zheng, Shijian; Ye, Hengqiang; Yang, Zhiqing

doi:10.1016/j.jmst.2020.06.017

Cited by 25 publications

(3 citation statements)

References 53 publications

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“…The complex stress field of the sheet without cracks during rolling makes the edge of the sheet bear greater plastic deformation, and no cracks generate to release energy, so the large deformation can activate various types of dislocations, resulting in the accumulation of high-density dislocations and the activation of <a + c> slip system to coordinate the strain of the c-axis have a positive effect on improving the formability of the magnesium alloy [ 21 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

et al. 2021

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The conventional rolling of magnesium alloy with a single pass and large reduction will cause severe edge cracking. The sheet without cracks can be achieved by limited width rolling. The microstructure evolution of the sheet with cracks after conventional rolling and the sheet without cracks after limited width rolling is explored, and an effective mechanism for solving edge cracks is proposed. Conventional rolling can fully develop twin evolution due to high deformation, and three stages of twinning evolution can be observed and the secondary twins easily become the nucleation points of micro cracks, resulting in a large number of cracks propagating along the twin lamellae. Cracks terminate at dislocation accumulation because the accumulation of a large number of dislocations can hinder propagation. Dislocation shearing of twins to eliminate the high localization caused by twins and induce the tensile twins to weaken the basal surface texture provides an effective plastic deformation mechanism of crack inhibition, which is useful for expanding the engineering application of magnesium alloy rolled sheets.

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Section: Resultsmentioning

confidence: 99%

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

et al. 2021

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“…The orientations of the twin variants are similar, and since the angle of deflection between the variants is small, we regard them as the activation of a twin variant. Meanwhile, the boundary of some of the twins was identified as HAGB, which may indicate dislocation-twin interaction [31]. From Figure 7c-e, we can learn the crystal orientation relationship of the twin variant.…”

Section: Ebsd Analysis Of Deformed Alloysmentioning

confidence: 99%

Dynamic Recrystallization, Texture Evolution, and Improved Mechanical Properties of Mg-Y-Zn-V Alloy during Forging and Subsequent Extruding Deformation

Liu,

Zhang,

Shi

et al. 2024

Metals

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In this paper, the electron backscatter diffraction (EBSD) technique was used to analyze the dynamic recrystallization (DRX), twinning, slip behavior, and texture evolution during forging and subsequent extruding deformation. The results show that, as the degree of strain increased (forging to extruding), the degree of DRX increased, and the DRX mechanism changed from discontinuous DRX (DDRX) during forging to DDRX and continuous DRX (CDRX) during extruding. Particle stimulation nucleation (PSN) promoting DRX occurred during deformation. The deformation process mainly produced {10–12} twins (TTW) and played a role in coordinating the deformation. The slip behavior also changed according to an analysis of in-grain misorientation axes (IGMA) results, changing from slip-dominated with a basal <a> slip to co-dominated with multiple slip modes, with the activation of mainly prismatic <a> and pyramidal <c+a> slip. Meanwhile, the strong basal texture at the beginning of the deformation also changed, and the texture strength decreased from 24.81 to 15.56. The weakening of the texture was mainly due to the formation of DRX grains and twins, as the newly formed DRX and twins reoriented. In the later stages of deformation, the activation of prismatic <a> slip and pyramidal <c+a> slip changed the basal texture component. Based on microstructural analysis, the improvement in mechanical properties was due to fine-grain strengthening and load-transfer strengthening. The ultimate tensile strength (UTS) was 370.5 MPa, the yield strength (YS) was 340.1 MPa, and the elongation (EL) was 15.6%.

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“…The interaction between TBs will affect the subsequent twin nucleation and growth process, thereby increasing the strain hardening rate of magnesium alloy [5]. Twin penetration at GBs will lead to stress concentration, induce structural changes, and affect the yield behavior and local shear band extension of magnesium alloys [6,7].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of multi-element co-segregation on mechanical properties of Mg 101ˉ2 twin grain boundary

Lin

Han

Tian

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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Properties of grain boundaries are pronouncedly influenced by alien elemental segregation. Synergistic effect of co-segregation behavior on mechanical properties of Mg {101̅2} twin grain boundary was systematically investigated with first-principles calculations. Ten elements (Ni, Mn, Zn, Al, Ag, Ti, Li, Zr, Y, Ca) for single segregation and four solute combinations (Al-Ca, Al-Y, Zn-Ca, Zn-Y) for co-segregation were chosen respectively, the segregation energies and solubility energies with different elemental concentrations were calculated to evaluate the thermodynamic stability of corresponding segregated grain boundaries. These solute atoms have unique effects on the stability of the system, and the interaction between solute atoms also has a synergistic effect on the stability of the system. It is found that the segregation tendency is enhanced and the grain boundary structure tends to be stable with the increase of the concentration of solute atoms at the appropriate sites, regardless of single-element segregation or co-segregation. The redistribution of grain boundary charges due to co-segregation significantly affects the binding and mechanical properties of grain boundaries. With the increase of the co-segregation concentration, the lamellar charge is transferred between the matrix and the twins, which further enhances the electron hybridization and leads to a notable enhancement of interface binding. This shows that the appropriate combination of solute elements can effectively improve the mechanical properties of the interface. The manuscript reveals the theoretical understanding of the effect of elemental segregation on the mechanical properties of grain boundary, and provides design ideas for the tuning of mechanical properties of magnesium alloy by grain boundary engineering.

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Atomic-resolution studies on reactions between basal dislocations and {101¯2} coherent twin boundaries in a Mg alloy

Cited by 25 publications

References 53 publications

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

Dynamic Recrystallization, Texture Evolution, and Improved Mechanical Properties of Mg-Y-Zn-V Alloy during Forging and Subsequent Extruding Deformation

Synergistic effect of multi-element co-segregation on mechanical properties of Mg 101ˉ2 twin grain boundary

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