The role of {10–12} tensile twinning in plastic deformation and fracture prevention of magnesium alloys

Tian, Jing; Deng, Jia-fei; Chang, Yuanying; Zhou, Yancai; Liang, Wei; Ma, Jinyao

doi:10.1016/j.msea.2022.143678

Cited by 28 publications

(6 citation statements)

References 38 publications

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“…Based on SEM images and EBSD data acquired during tensile testing, slip trace analysis was performed to identify activated slip systems. The following common slip systems in magnesium alloys are considered [ 18 , 29 , 30 , 31 , 32 ]:…”

Section: Methodsmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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In this paper, quasi-in situ experiments were carried out on rolled AZ31 magnesium alloy sheets to track the recrystallization behavior of the rolled microstructure during the heat treatment process and the plastic deformation behavior during the stretching process. The as-rolled microstructures are classified into five characteristics and their plastic deformation behaviors are described. The research shows that annealing recrystallization leads to grain reorganization, resulting in the diversity of grain orientation, and it is easier to activate basal slip. Recrystallization preferentially nucleates in the regions with high stress, while it is difficult for recrystallization to occur in regions with low stress, which leads to the uneven distribution of the as-rolled structure of magnesium alloys. Slip can be better transmitted between small grains, while deformation between large and small grains is difficult to transmit, which can easily lead to the generation of ledges. Incomplete recrystallization is more likely to accumulate dislocations than complete recrystallization, and ledges are formed in the early stage of deformation. Microcracks are more likely to occur between strain-incompatible grains. It is of great significance to promote the application of rolled AZ31 magnesium alloys for the development of heat treatment and subsequent plastic working of rolled magnesium alloys.

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Section: Methodsmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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“…Additionally, the orientations of the matrix and twins in the {10 ̅ 11} and {10 ̅ 12} pole figures were analyzed. Since twins usually evolve from the matrix grains, they often share a common {10 ̅ 12} or {10 ̅ 11} plane with the matrix [54,55]. Therefore, identifying the shared poles in the pole figures can help recognize the twin variant types, which is crucial for understanding the twinning behavior.…”

Section: Evolution Of Microstructurementioning

confidence: 99%

Prediction of flow stress in Mg-3Dy alloy based on constitutive equation and PSO-SVR model

Liu,

Feng,

Liu

et al. 2024

Mater. Res. Express

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This study conducted hot compression experiments on as-cast Mg-3Dy alloy under deformation parameters of 380-470℃ and 0.001-1s-1. The microstructure of the alloy was observed using EBSD, and the flow stress of the Mg-3Dy alloy was predicted using the Arrhenius model and the particle swarm optimization-support vector regression (PSO-SVR) model. The organizational analysis results showed that the main recrystallization mechanism in the alloy is the discontinuous dynamic recrystallization (DDRX) mechanism. The generation of twins in the alloy was mostly the result of local stress action. The optimal processing window for this alloy was determined to be 380-470 °C and 0.001-0.01 s-1 through the thermal processing map. The prediction accuracies of the Arrhenius model and PSO-SVR model were evaluated using the correlation coefficient R2 and mean squared error MSE. The results showed that the PSO-SVR model significantly outperforms the Arrhenius model in prediction accuracy, with R2 value of 0.99982 and MSE of 0.074.

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“…Transgranular fractures are susceptible to propagating at 1011 twin grain boundaries in failed specimens with twin planes as the main cleavage planes [20]. The promoting effect of Mn on prismatic slips is still controversial, and the effect of different deformation twins ( 1012 tensile twins, 1011 compressive twins, and 1011 -1012 secondary twins) on the elongation of the alloys has not been accurately determined [21,22]. At present, the analysis of tensile fracture mechanisms is mainly based on the observation of the fracture surface of tensile specimens, which can be classified as cleavage fractures or ductile fractures from a macro perspective.…”

Section: Introductionmentioning

confidence: 99%

Improving Mechanical Properties of Mg-Al-RE Alloys with the Formed Dimples of Al10Mn2RE Particles and Activated Pyramidal <a> Slip with Mn Additions

Yang,

Wang,

Zhang

et al. 2023

Materials

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The effects of Mn addition on the room temperature tensile strength and deformation mechanisms of as-cast Mg-8Al-1Nd-1.5Gd-xMn alloys (x = 0, 0.3, 0.5, 1.0 wt.%) are investigated in this paper. The results indicate that the addition of Mn contributes to the precipitation of Al-Mn-RE intermetallics and the refinement of α-Mg matrices, thereby improving the tensile strength of the 1.0 Mn alloy at 190 MPa. The fracture mechanism of Mn-containing alloys transforms from a cleavage fracture to a ductile fracture as the Mn content increases from 0.3 to 1.0 wt.%. The presence of intermetallic particles in the dimples confirms the hindrance effect of Al10Mn2 (Nd,Gd) on dislocation slips. The novel technology of in-grain misorientation axes (IGMAs) is used to identify activated slip modes and deformation twins. It can be concluded that the activated pyramidal <a> slip during tensile deformation significantly promotes the ductility of the 1.0 Mn alloy with an elongation rate of 9.8%. It is worth noting that reducing the coarse 101¯2 tensile twins and enhancing the proportion of 101¯1 compressive twins and 101¯1-101¯2 double twins contributes to maintaining the continuous plastic deformation of Mg alloy.

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The role of {10–12} tensile twinning in plastic deformation and fracture prevention of magnesium alloys

Cited by 28 publications

References 38 publications

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

Prediction of flow stress in Mg-3Dy alloy based on constitutive equation and PSO-SVR model

Improving Mechanical Properties of Mg-Al-RE Alloys with the Formed Dimples of Al10Mn2RE Particles and Activated Pyramidal <a> Slip with Mn Additions

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