Orientation effect on twin formation mechanisms of tungsten under uniaxial tension/compression

Li, Yuncheng; Xie, Hongxian; Zhen, Dong

doi:10.1016/j.mtcomm.2023.106790

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…SF is an effective method to reveal the likelihood of slip system activation [23]. The SFs of each slip system were calculated based on the following equation [24]:…”

Section: Quasi In Situ Slip Traces Analysismentioning

confidence: 99%

Quasi In Situ Study on the Slipping Behavior and Residual Stress of Copper Strip

Liu,

Zhu,

Zhou

et al. 2024

Metals

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The preparation method of integrated circuit lead frames has transitioned from stamping to etching, rendering them more sensitive to residual stress. Consequently, the dimensional deviations caused by residual stress become more pronounced, necessitating a thorough investigation into the copper strip processing process, particularly considering the high-precision requirements of the lead frame. A quasi in situ method was employed to monitor the deformation process, and quantitative analyses and graphical reconstructions of the residual stress were conducted. The results indicated that the orientation evolution did not exhibit a significant correlation with grain size or grain aspect ratio. However, the stored energy of the different grains was related to their orientations. Further analysis of slip traces revealed that single or multiple slipping may be activated in grain subdivisions, and the Schmid factor difference ratio (SFDR) value proved to be an effective tool for analyzing this deformation mode. An even more interesting finding was that the deformation mode directly affected the residual stress distribution in local regions. The relationship between residual stress, Schmid factor, and SFDR was further analyzed, and a clear correlation between SFDR and residual stress was found in this study.

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“…SF is an effective method to reveal the likelihood of slip system activation [23]. The SFs of each slip system were calculated based on the following equation [24]:…”

Section: Quasi In Situ Slip Traces Analysismentioning

confidence: 99%

Quasi In Situ Study on the Slipping Behavior and Residual Stress of Copper Strip

Liu,

Zhu,

Zhou

et al. 2024

Metals

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“…Utilizing single-crystal nanowires as samples can allow for a clear observation of the atomic-level behavior of materials during deformation, − enabling the revelation of the inherent deformation mechanism of NbMoTaW RHEAs. Existing research on BCC metal nanowires has mainly focused on pure metals, − with relatively limited research on BCC HEA nanowires. Aitken and Zhang observed that the deformation of BCC HEA nanopillars under <001> compression was governed by twinning with a proposed mechanism of twin nucleation from the surface.…”

Section: Introductionmentioning

confidence: 99%

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Pan,

Fu,

Duan

et al. 2024

ACS Appl. Nano Mater.

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In recent years, considerable research efforts have been directed toward addressing the room-temperature brittleness of BCC NbMoTaW refractory high entropy alloys (RHEAs). However, there has been limited investigation of the plastic deformation mechanism at room temperature. In this work, we utilized molecular dynamics simulation to investigate the mechanical behavior and atomistic plastic deformation mechanism of BCC NbMoTaW RHEA nanowires under uniaxial compression/tension. It showed that, under tension, the primary deformation mechanism of the nanowires involves the nucleation and growth of twins from the surface, while under compression, the deformation is predominantly attributed to dislocation slip and twinning, with the twins formed by the dissociation of screw dislocations, differing from the twin nucleation and growth under tension. Furthermore, the tension−compression asymmetry of the nanowires was discussed in detail, considering the atomic arrangement and energy barrier. This work contributes to a deeper understanding of the relationship between the deformation mechanism and mechanical response of NbMoTaW RHEAs, which is significant for their rational design and aerospace applications.

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Orientation effect on twin formation mechanisms of tungsten under uniaxial tension/compression

Cited by 2 publications

References 37 publications

Quasi In Situ Study on the Slipping Behavior and Residual Stress of Copper Strip

Quasi In Situ Study on the Slipping Behavior and Residual Stress of Copper Strip

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

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