Shear response of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Σ</mml:mi><mml:mn>3</mml:mn><mml:mo stretchy="false">{</mml:mo><mml:mn>112</mml:mn><mml:mo stretchy="false">}</mml:mo></mml:mrow></mml:math>twin boundaries in face-centered-cubic metals

Wang, Jian; Misra, Amit; Hirth, J. P.

doi:10.1103/physrevb.83.064106

Cited by 124 publications

(65 citation statements)

References 54 publications

(82 reference statements)

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“…In twinned Al, the ITB migration-accommodated plasticity at greater stress can be explained by the interface disconnection glide mechanism revealed by MD simulations 14 . First, lattice dislocations dissociate at the ITB, causing its migration accompanied by load drop.…”

Section: Itbmentioning

confidence: 99%

“…The majority of prior studies focused on metals with low stacking-fault energy (SFE) (Cu, Ag) and/or a low ratio of unstable twinning (g ut ) to unstable stacking energy (g us ), because twins readily form in such metals during growth or deformation [10][11][12][13] . Although the density of incoherent twin boundaries (ITBs) is typically lower than that of CTBs, both CTBs and ITBs have been found to play crucial roles in plastic deformation in nt metallic materials with low SFE; CTBs act as barriers for slip, but ITBs can easily migrate in association with detwinning 14,15 . Furthermore, the deformation mechanisms of nt metals with extremely fine nanotwins are dominated by Shockley partial dislocations 4 , which are mostly nucleated from ITBs.…”

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confidence: 99%

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In situ nanoindentation study on plasticity and work hardening in aluminium with incoherent twin boundaries

et al. 2014

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Nanotwinned metals have been the focus of intense research recently, as twin boundaries may greatly enhance mechanical strength, while maintaining good ductility, electrical conductivity and thermal stability. Most prior studies have focused on low stacking-fault energy nanotwinned metals with coherent twin boundaries. In contrast, the plasticity of twinned high stacking-fault energy metals, such as aluminium with incoherent twin boundaries, has not been investigated. Here we report high work hardening capacity and plasticity in highly twinned aluminium containing abundant S3{112} incoherent twin boundaries based on in situ nanoindentation studies in a transmission electron microscope and corresponding molecular dynamics simulations. The simulations also reveal drastic differences in deformation mechanisms between nanotwinned copper and twinned aluminium ascribed to stacking-fault energy controlled dislocation-incoherent twin boundary interactions. This study provides new insight into incoherent twin boundary-dominated plasticity in high stacking-fault energy twinned metals.

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Section: Itbmentioning

confidence: 99%

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confidence: 99%

In situ nanoindentation study on plasticity and work hardening in aluminium with incoherent twin boundaries

et al. 2014

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“…This is equivalent to separately considering the displacements of the pure step component and those of the dislocation and then adding them. This method has been programmed for simulations of dislocations and twins in face-centered cubic (fcc) and body-centered cubic structures [55,56], and extended for dislocations and twins in hcp structure [57]. After a TD glides, remote atoms above and below the shear plane experience a relative displacement of b t .…”

Section: Twinning Disconnectionsmentioning

confidence: 99%

Interface structures and twinning mechanisms of twins in hexagonal metals

Gong

Hirth

Liu

et al. 2017

Materials Research Letters

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A controversy concerning the description of {1012} 1011 twinning, whether it is shear-shuffle or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the interpretation of transmission electron microscopic observations, atomistic simulations and theories for twin growth. In this article, we highlight the atomic-level, characteristic, equilibrium and non-equilibrium boundaries and corresponding boundary defects associated with the threedimensional 'normal', 'forward' and 'lateral' propagation of {1012} growth/annealing and deformation twins. Although deformation twin boundaries (TBs) after recovery exhibit some similarity to growth/annealing TBs because of the plastic accommodation of stress fields, there are important distinctions among them. These distinctions distinguish among the mechanisms of twin growth and resolve the controversy. In addition, a new type of disconnection, a glide disclination, is described for twinning. Synchroshear, seldom considered, is shown to be a likely mechanism for {1012} twinning. IMPACT STATEMENTA controversy concerning {1012} 1011 twinning in hcp metals has developed. We present comprehensive understanding of interface structures and twinning mechanisms of {1012} growth/annealing and deformation twins at the atomic level. ARTICLE HISTORY

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“…Compared to coherent Σ3{111} twin boundaries, Σ3{112} incoherent twin boundaries (ITBs) have been less studied. 36,37 It has been found that the Σ3{112} ITBs have a larger mobility than coherent twin boundaries. According to Li et al, 38 slip bands can transmit through ITBs in Cu, and the penetrability and mobility of the ITBs contribute to a higher fatigue cracking resistance.…”

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Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

Jin

Zhang

Bjørge

et al. 2015

Applied Physics Letters

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Deformation twinning has rarely been observed in aluminum and its alloys because of their high stacking fault energy (SFE). Here, we report that a significant amount of Σ3 deformation twins could be generated in a coarse-grained Al-7Mg alloy by dynamic plastic deformation (DPD). A systematic investigation of the Σ3 boundaries shows that they are Σ3{112} type incoherent twin boundaries (ITBs). These ITBs have formed by gradual evolution from copious low-angle deformation bands through <111>-twist Σ boundaries by lattice rotation. These findings provide an approach to generate deformation twin boundaries in high SFE metallic alloys. It is suggested that high solution content of Mg in the alloy and the special deformation mode of DPD played an important role in formation of the Σ and ITBs.

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Shear response ofΣ3{112}twin boundaries in face-centered-cubic metals

Cited by 124 publications

References 54 publications

In situ nanoindentation study on plasticity and work hardening in aluminium with incoherent twin boundaries

In situ nanoindentation study on plasticity and work hardening in aluminium with incoherent twin boundaries

Interface structures and twinning mechanisms of twins in hexagonal metals

Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

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