Microstructure evolution during cold rolling in a nanocrystalline Ni–Fe alloy determined by synchrotron X-ray diffraction

Li, L.; Ungár, Tamás; Wang, Y.D.; Morris, James R.; Tichy, G.; Lendvai, J.; Yang, Yijie; Ren, Yang; Choo, Hahn; Liaw, Peter K.

doi:10.1016/j.actamat.2009.07.002

Cited by 73 publications

(36 citation statements)

References 52 publications

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“…[28,39,124,125,128]. Such stress (strain) assisted grain growth has been reported by several groups [28,39,[118][119][120][121][124][125][126][128][129][130][131][132][133][134][135][136][137][138][139] and can occur at even liquid nitrogen temperature [129,130]. These observations suggest that grain rotation play a significant role in the deformation of nc metals and alloys and it often leads to grain growth.…”

Section: Grain Rotationmentioning

confidence: 63%

“…Almost all studies so far have focused on the formation of deformation twins. There have been recent studies on the detwinning process in nc materials also occurs in the nc fcc metals [131,156,227,246,285,286,334,335]. However, issues that are of interest for future studies include: (a) more experimental observations on the de-twinning process to compare with the proposed mechanisms [285,335], (b) the grain size effect of de-twinning, and (c) the existence of an equilibrium twin density and thickness.…”

Section: Outstanding Issuesmentioning

confidence: 99%

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Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,170

447

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Section: Grain Rotationmentioning

confidence: 63%

Section: Outstanding Issuesmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,170

447

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“…Grain size effect on detwinning in nc fcc materials Deformation-induced detwinning has been observed both experimentally [48,50,[70][71][72] and in MD simulations [73]. This raises a critical issue on the effect of grain size on the competition between deformation twinning and detwinning.…”

Section: Experimental Observations On the Grain Size Effectmentioning

confidence: 99%

Grain size effect on deformation twinning and detwinning

et al. 2013

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This article systematically overviews the grain size effect on deformation twinning and detwinning in face-centered cubic (fcc) metals. With decreasing grain size, coarse-grained fcc metals become more difficult to deform by twinning, whereas nanocrystalline (nc) fcc metals first become easier to deform by twinning and then become more difficult, exhibiting an optimum grain size for twinning. The transition in twinning behavior from coarse-grained to nc fcc metals is caused by the change in deformation mechanisms. An analytical model based on observed deformation physics in nc metals, i.e., grain boundary emission of dislocations, provides an explanation of the observed optimum grain size for twinning in nc fcc metals. The detwinning process is caused by the interaction between dislocations and twin boundaries. Under a certain deformation condition, there exists a grain size range where the twinning process dominates over the detwinning process to produce the highest density of twins.

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“…Recently detwinning process (to annihilate twin) has been observed to occur during the deformation of nanocrystalline [15][16][17][18]. Twinning and detwinning are two important deformation processes in nc materials.…”

mentioning

confidence: 99%

MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni

Tang

2013

Sci. China Phys. Mech. Astron.

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Molecular dynamics simulations are performed to investigate the deformation behavior of nanocrystalline Ni with pre-twin atom structure. The simulation sample is composed of four grains with average size 12 nm. The simulation technique of isobaric-isothermal ensemble (NPT) with high pressure is applied to obtain a sample with two circle twins. Under uniaxial tensile and shear loading, as well as different detwinning deformation behaviors are observed. Under uniaxial tension the detwinning deformation is induced by the event of grain growth, and it is supported by local energy analysis. Under the shear loading the detwinning deformation is related to the loading rate. The results show that there may be a critical shear rate. As the shear rate is sufficiently high the circle twin is found to be failed; as the shear rate is less than that rate, the size of circle twin become smaller and gradually approach a constant value. Our simulation results are in good agreement with experiment observation.

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Microstructure evolution during cold rolling in a nanocrystalline Ni–Fe alloy determined by synchrotron X-ray diffraction

Cited by 73 publications

References 52 publications

Deformation twinning in nanocrystalline materials

Deformation twinning in nanocrystalline materials

Grain size effect on deformation twinning and detwinning

MD simulations of loading rate dependence of detwinning deformation in nanocrystalline Ni

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