Plastic flow stability of nanotwinned Cu foils

Anderoglu, Osman; Misra, Amit; Wang, Jian; Hoagland, R. G.; Hirth, J. P.; Zhang, X.

doi:10.1016/j.ijplas.2009.11.003

Cited by 100 publications

(35 citation statements)

References 53 publications

(63 reference statements)

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“…The presence of twin boundaries causes a change of crystal orientations between matrix and twinned crystals [8,9] and a discontinuity of slip systems across twin boundaries [10,11]. Consequently a high resolved shear stress is required to transmit a single dislocation across twin boundaries, thereby strengthening materials [10][11][12][13][14][15]. Lu et al showed that ultrafinegrained Cu with high-density growth twins could achieve an unusual combination of ultrahigh strength (1 GPa) and high ductility (14% elongation to failure) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Detwinning mechanisms for growth twins in face-centered cubic metals

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Detwinning mechanisms for growth twins in face-centered cubic metals

et al. 2010

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“…Both experimental and theoretical efforts have been made in investigating the deformation behavior of nt Cu subjected to different loading modes, including tension, rolling, and nanoindentation. [3][4][5][6][7][8][9][10][11][12] It is found that the high strength of nt Cu is a result of TBs acting as effective obstacles to dislocation motion, while the eminent ductility is owing to the enhanced dislocation nucleation sites provided by TBs. To date, limited information is known about the deformation mechanism of nt Cu during wear process.…”

Section: Introductionmentioning

confidence: 99%

Twin boundary spacing-dependent friction in nanotwinned copper

et al. 2012

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The deformation mechanisms of nanotwinned Cu subjected to nanoscratching are investigated by means of molecular dynamics simulations. Scratching simulations on nanotwinned single-crystalline Cu with the twin planes parallel and perpendicular to the scratching direction are performed. Since the detwinning mechanism is completely suppressed in the former case, no apparent correlation between frictional coefficient and the twin spacing is observed. In samples where the twin planes are perpendicular to the scratching direction, the friction increases as the twin spacing decreases, and then decreases as the twin spacings become even smaller. It results from the competitive plastic deformation between the inclined dislocations and the detwinning mechanism. Subsequent simulations for nanotwinned polycrystalline Cu unveil that in addition to the grainboundary-associated deformation mechanism, dislocation-mediated detwinning plays a significant role in the plastic deformation of nanotwinned Cu. The twin boundary spacing in turn affects nanotwinned materials to resist scratching via plastic deformation. We demonstrate via the nanoscratching tests that there exists a critical twin boundary spacing for which the friction coefficient is maximized and that this transition results from the competing deformation mechanisms in those nanotwinned materials.

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“…[16,31,32] Besides, the formation of twins with low excess energy, the interaction between Al atoms with GBs and the formation of short-range order (SRO) are also beneficial to the improvement of microstructures stability. [16,33,34] Although the formation mechanism of the shear bands during cyclic deformation is not well understood, this kind of surface damage was significantly lessened with lowering of the SFE as well, which could be attributed to the changed GB natures stemming from the lowered SFE. [35] Additionally, the nature of planar slip in the materials with low SFE and SRO will facilitate reducing the strain localizations as well.…”

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confidence: 99%