Stacking fault energies and slip in nanocrystalline metals

Swygenhoven, H. Van; Derlet, P. M.; Frøseth, A. G.

doi:10.1038/nmat1136

Cited by 911 publications

(567 citation statements)

References 32 publications

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“…Besides, the different pseudopotentials as used in the calculations (cf. [20,38]. Instead, several features of the full GPFE curves are needed to determine the plastic deformation mechanisms of materials, and to predict the propensity for formation of stacking faults, nucleation of dislocations and deformation twins.…”

Section:  mentioning

confidence: 99%

Impurity effect of Mg on the generalized planar fault energy of Al

et al. 2016

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Generalized Planar Fault Energy (GPFE) curves are widely used to evaluate the deformation behavior of metals and alloys. In the present work, a systematic analysis of the microscopic plastic deformation mechanism of face-centered cubic Al in comparison to Cu was conducted based on GPFE curves generated via first-principles calculations. Focus has been put on the effects of Mg impurities in terms of local concentration and local atomic arrangement nearby the deformation plane, upon the GPFE curve of Al, with the aim to investigate the twinnability of Al-Mg alloys subjected to plastic deformation.It is found that Mg exhibites a Suzuki segregation feature to the stacking fault of Al, either intrinsic or extrinsic. Mg atoms residing in the stacking fault plane can decrease the intrinsic stacking fault energy  ISFE and enhance the twinning propensity of Al. However, the  ISFE value does not decrease monotonically with increasing Mg concentration in the alloy, and a continuous twinnability increase with increasing Mg content is not observed. It is also seen that different local concentrations and atomic configurations of Mg atoms in the vicinity of deformation plane could yield a large variation of  ISFE and the twinning propensity of Al. It is proposed that Mg alloying cannot substantially enhance the twinning propensity of Al alloys.

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Section:  mentioning

confidence: 99%

Impurity effect of Mg on the generalized planar fault energy of Al

et al. 2016

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“…Hence, there have been a number of studies in face-centered cubic (fcc) metals investigating the grain size associated with this behavior, the role of grain boundaries and stacking fault energy in nucleating dislocations and the subsequent behavior of dislocations afterward. [145][146][147][148] What is generally observed with the grain boundary dislocation activity is that the dislocation density increases, which results in both dynamic recovery and increased dislocation annihilation; this ultimately limits the capacity for dislocation storage. 4 This low saturation of dislocation density leads to the very low strain-hardening rate typically seen.…”

Section: Strain Hardeningmentioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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It is a new beginning for innovative fundamental and applied science in nanocrystalline materials. Many of the processing and consolidation challenges that have haunted nanocrystalline materials are now more fully understood, opening the doors for bulk nanocrystalline materials and parts to be produced. While challenges remain, recent advances in experimental, computational, and theoretical capability have allowed for bulk specimens that have heretofore been pursued only on a limited basis. This article discusses the methodology for synthesis and consolidation of bulk nanocrystalline materials using mechanical alloying, the alloy development and synthesis process for stabilizing these materials at elevated temperatures, and the physical and mechanical properties of nanocrystalline materials with a focus throughout on nanocrystalline copper and a nanocrystalline Cu-Ta system, consolidated via equal channel angular extrusion, with properties rivaling that of nanocrystalline pure Ta. Moreover, modeling and simulation approaches as well as experimental results for grain growth, grain boundary processes, and deformation mechanisms in nanocrystalline copper are briefly reviewed and discussed. Integrating experiments and computational materials science for synthesizing bulk nanocrystalline materials can bring about the next generation of ultrahigh strength materials for defense and energy applications.

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“…High pressure torsion (HPT) is one of the most promising SPD techniques because it has the potential to produce nanostructures with grain sizes of less than 100 nm [5][6]. Although outstanding progress has been made in this area in recent years, genesis of the structural features in SPD-processed metals is not yet fully understood [6][7][8][9][10][11][12]. In our previous works, deformation defects such as full and partial dislocations, dipoles, microtwins and stacking faults (SFs) have been frequently observed using transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) in nanostructured Al-Mg alloys subjected to HPT [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Deformation defects and electron irradiation effect in nanostructured Al–Mg alloy processed by severe plastic deformation

Liu

Roven

et al. 2012

Transactions of Nonferrous Metals Society of China

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In order to explore the exact nature of deformation defects previously observed in nanostructured Al-Mg alloys subjected to severe plastic deformation, a more thorough examination of the radiation effect on the formation of the planar defects in the high pressure torsion (HPT) alloys was conducted in this paper using high-resolution transmission electron microscopy (HRTEM). The results show that high densities of the defects in the HRTEM images disappear completely when these images expose under the electron beam for some duration of time. At the same time, lattice defects are never been observed within no-defect areas even when the beam-exposure increases to the degree that holes appear in the areas. Therefore, the HRTEM examinations confirm that the planar defects observed in the HPT alloys are mainly resulted from the significant plastic deformation and are not due to the radiation effect during HRTEM observation.

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Stacking fault energies and slip in nanocrystalline metals

Cited by 911 publications

References 32 publications

Impurity effect of Mg on the generalized planar fault energy of Al

Impurity effect of Mg on the generalized planar fault energy of Al

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Deformation defects and electron irradiation effect in nanostructured Al–Mg alloy processed by severe plastic deformation

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