Dislocation behavior in a polycrystalline Mg-Y alloy using multi-scale characterization and VPSC simulation

Zhou, Bijin; Wang, Leyun; Wang, Jinhui; Maldar, Alireza; Zhu, Gaoming; Jia, Hai-Long; Jin, Peipeng; Zeng, Xiaoqin; Li, Yanjun

doi:10.1016/j.jmst.2021.03.087

Cited by 45 publications

(8 citation statements)

References 43 publications

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“…Then, they piled up at the phase interfaces or GBs rapidly. Non-basal slip should play a role in accommodating the local deformation [ 20 , 46 ]. With the strain increases, the local stress concentration near phase interfaces and GBs was larger.…”

Section: Resultsmentioning

confidence: 99%

“…The extrusion microstructure was characterized by optical microscopy (OM, Zeiss Axio observer, Oberkochen, Germany), electron backscattered diffraction (EBSD, Oxford NordlysMax 2 , Oxford, UK), and transmission electron microscopy (TEM, JEOL-2100F, Akishima, Tokyo, Japan). The details of sample preparation for characterizing microstructures were reported previously [ 20 , 21 ].…”

Section: Methodsmentioning

confidence: 99%

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Deformation Behavior of β Phase in a WE54 Magnesium Alloy

et al. 2023

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Second phases play a significant role in the development of high-performance magnesium alloys with rare earth elements. Here, in situ tensile tests combined with synchrotron radiation were carried out to investigate the deformation behavior of β phases in a WE (Mg–Y–Gd–Nd) alloy. By lattice strain analysis, it was found that micro load continuously transferred from the soft α-Mg matrix to the hard β phases during the whole plastic deformation, while this behavior was much more obvious at the beginning of deformation. Based on diffraction peak broadening, Williamson–Hall (W–H) plotting was used to study the microstrain of β phases. The results showed that the microstrain of β phases increased rapidly within 4% plastic strain and reached the maximum at plastic strain of ~6.5%. Since the β phases acted as hard phases, the microstrain was considered as a sign of the stress concentration near phase interfaces. It was also suggested that the effective release of local stress concentration at the β/α-Mg interface benefited the ductility of the WE alloy by the plastic deformation of β phases and phase interface sliding.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Deformation Behavior of β Phase in a WE54 Magnesium Alloy

et al. 2023

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“…The rolled plates are sampled for electron backscatter diffraction (EBSD) testing and room-temperature tensile tests. Then, the viscoplastic self-consistent model (VPSC) model is used to simulate the rolling deformation [ 18 , 19 , 20 , 21 ] of the above-mentioned representative ZK61 plate. Through the combination of symmetrical rolling and asymmetric rolling experiments, the aim is to prepare magnesium alloy sheets with high mechanical properties, and the yield strength, tensile strength and elongation of the final sheets are greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Mechanism of High Strength and Toughness ZK61 Magnesium Alloy Plate by Multipass Horizontal Continuous Rolling

Chen

Liu

et al. 2023

Materials

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ZK61 magnesium-alloy plate with high tensile strength and elongation is obtained by combined multipass symmetric hot rolling and asymmetric warm rolling. Deformation history considering varying strain rate obtained from the macro-finite element analysis of the selected passes are introduced into the viscoplastic self-consistent model (VPSC) as initial boundary conditions for macro- multiscale and micro-multiscale coupling analysis. VPSC simulation results show that in the initial stage of rolling deformation, the basal <a> slip is the dominated deformation mode, supplemented by prismatic <a> slip and pyramidal <c+a> slip. With increased rolling strain, the pyramidal <c+a> slip presents competitive relationship with basal <a> slip, and the activation amount of {10—11} compression twins is limited. During asymmetric rolling, the basal <a> slip is dominant, followed by the pyramidal <c+a> slip. Experimental results show that the basal texture is gradually strengthened after symmetric rolling, and grain size is refined due to the activation and recrystallization of twins. Asymmetric rolling makes the basal texture deflect 10° to the rolling direction and further refine the grain size. With the ongoing of symmetric rolling, the mechanical anisotropy of the plate weakens, and the yield strength, tensile strength, and plasticity of the material improves. In particular, after asymmetric rolling, the tensile strength in the RD and TD directions of the plate reaches 391.2 MPa and 398.9 MPa, whereas the elongation reaches 19.8% and 25.5%.

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“…For example, the addition of rare earth elements to pure Mg can weaken the texture [9,13] and reduce the ratios between non-basal slips CRSS and basal slip CRSS, and cross slip barrier. The initiations of non-basal slip systems during deformation can provide more pathways for inducing dislocation slip [14,15], which enhances the plasticity of Mg alloys. Therefore, adding rare earth elements to Mg alloys has received extensive attention.…”

Section: Introductionmentioning

confidence: 99%

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

Zhang,

Wang

et al. 2023

Mater. Res. Express

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The present study subjects the extruded Mg-6Al-1Zn-1.1Sc (wt. %) alloy to reveal the deformation during in-situ tensile at room temperature by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results demonstrate that the parallel slip traces are increasingly observed on the surfaces of grains with increasing strains owing to the movement of dislocations inside the grains toward the sample surface, while microcracks are frequently observed at grain boundaries. The slip trace analysis indicate that many basal slips are activated during the deformation. The twinning behaviors of the extruded alloy during tensile are dominated by extension twinning. The orientation of grains is demonstrated to have a profound effect on their deformation, where grains with orientations deviating greatest from <0001>//TD exhibit the highest dislocation density after deformation. This can be attributed to the fact that these oriented grains are prone to activate basal slip due to the large Schmid factor (SF). Similarly, the deformation of grains is also found to be highly dependent on their size, where the dislocation density of coarser grains increases more significantly than that of finer grains during deformation because coarser grains have greater space available for accommodating dislocations than finer grains.

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Dislocation behavior in a polycrystalline Mg-Y alloy using multi-scale characterization and VPSC simulation

Cited by 45 publications

References 43 publications

Deformation Behavior of β Phase in a WE54 Magnesium Alloy

Deformation Behavior of β Phase in a WE54 Magnesium Alloy

Plastic Deformation Mechanism of High Strength and Toughness ZK61 Magnesium Alloy Plate by Multipass Horizontal Continuous Rolling

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

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