<i>In situ</i> observation of cross-grain twin pair formation in pure magnesium

Culbertson, Duke; Yu, Qin; Jiang, Yanyao

doi:10.1080/09500839.2018.1498599

Cited by 20 publications

(5 citation statements)

References 17 publications

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“…Since hcp metals are favorable for the formation of deformation twins, they have been taken as one of the model metals to study the deformation twin-grain boundary interaction, especially pure Mg and Mg alloy. Similar results have been obtained in these studies [ 14 , 32 , 36 , 149 , 150 , 151 ] and several factors are engaged in the behavior of twin transmission across a grain boundary in coarse-grained metals, which has many characteristics in common with dislocation–grain boundary interaction.…”

Section: Interactions Between Deformation Twin and Boundarysupporting

confidence: 87%

“…On the other hand, compared with the dislocation–boundary interactions, there is few studies on the influencing factors of twin–boundary interactions. For example, the studies of twin–grain boundary interaction mainly focus on the grain boundary misorientation in hcp metals [ 14 , 32 , 36 , 149 , 150 ]. Whereas most researches of twin–twin interaction investigate what occurs during the interaction [ 13 , 38 , 39 , 148 ], but few of them involve investigations of influencing factors.…”

Section: Discussionmentioning

confidence: 99%

“…Twin transmission always occurs in the case of crossing a low angle grain boundary. The speed of twin transmission across low angle grain boundary is rapid, which is observed by in-situ SEM and in-situ optical microscopy (OM) mechanical testing [ 149 , 150 ].…”

Section: Interactions Between Deformation Twin and Boundarymentioning

confidence: 99%

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Interactions between Dislocations and Boundaries during Deformation

Pan

Zhang

2021

Materials

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The interactions between dislocations (dislocations and deformation twins) and boundaries (grain boundaries, twin boundaries and phase interfaces) during deformation at ambient temperatures are reviewed with focuses on interaction behaviors, boundary resistances and energies during the interactions, transmission mechanisms, grain size effects and other primary influencing factors. The structure of boundaries, interactions between dislocations and boundaries in coarse-grained, ultrafine-grained and nano-grained metals during deformation at ambient temperatures are summarized, and the advantages and drawbacks of different in-situ techniques are briefly discussed based on experimental and simulation results. The latest studies as well as fundamental concepts are presented with the aim that this paper can serve as a reference in the interactions between dislocations and boundaries during deformation.

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Section: Interactions Between Deformation Twin and Boundarysupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Interactions between Dislocations and Boundaries during Deformation

Pan

Zhang

2021

Materials

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Section: Discussionmentioning

confidence: 55%

“…Our MD simulation results capture the critical feature of faster TT propagation compared to twin thickening [34,[41][42][43][44] and isolate the importance of disconnections in this process, but also allow for the development of a general model for twin embryo growth. A quantitative description of the evolution of twin length and thickness allows us to connect MD models on the nanoscale to experimental work that usually reports on a much larger length-scale.…”

Section: Discussionmentioning

confidence: 67%

Disconnection-Mediated Twin Embryo Growth in Mg

Turlo

Beyerlein

et al. 2019

SSRN Journal

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While deformation twinning in hexagonal close-packed metals has been widely studied due to its substantial impact on mechanical properties, an understanding of the detailed atomic processes associated with twin embryo growth is still lacking. Conducting molecular dynamics simulations on Mg, we show that the propagation of twinning disconnections emitted by basalprismatic interfaces controls the twin boundary motion and is the rate-limiting mechanism during the initial growth of the twin embryo. The time needed for disconnection propagation is related to the distance between the twin tips, with widely spaced twin tips requiring more time for a unit twin boundary migration event to be completed. Thus, a phenomenological model, which unifies the two processes of disconnection and twin tip propagation, is proposed here to provide a quantitative analysis of twin embryo growth. The model fits the simulation data well, with two key parameters (twin tip velocity and twinning disconnection velocity) being extracted. In addition, a linear relationship between the ratio of twinning disconnection velocity to twin tip velocity and the applied shear stress is observed. Using an example of twin growth in a nanoscale single crystal from the recent literature, we find that our molecular dynamics simulations and analytical model are in good agreement with experimental data.

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Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD

Guo

Xin

et al. 2019

Adv Eng Mater

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Twin pairs are frequently observed at the common grain boundaries of Mg alloys. The formation of twin pairs is associated with a twin transmission (TT) process. Investigating the TT process is important for understanding the deformation mechanism of Mg alloys. Here, the authors report an in situ electron backscatter diffraction (EBSD) examination on the TT process in AZ31 Mg alloys subjected to tensile deformation. TT process is clearly observed by band contrast images resulting in the formation of twin chains as strain increases. Interestingly, transmitted twins are developed in advance in form of non‐indexing dislocations or twins in neighboring grain. The TT direction is roughly along the shear plane normal or shear direction of the paired twins. In addition, multiple twin variants are activated by TT mechanism and nucleation of new twins at pre‐existing twin boundaries.

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In situ observation of cross-grain twin pair formation in pure magnesium

Cited by 20 publications

References 17 publications

Interactions between Dislocations and Boundaries during Deformation

Interactions between Dislocations and Boundaries during Deformation

Disconnection-Mediated Twin Embryo Growth in Mg

Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD

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