Formation of ⟨100⟩ dislocation loop in bcc-Fe via the ternary loop reaction

Wang, Xiaoyang; Gao, Ning; Wang, Yinan; Wu, Xiaoyu; Shu, Guogang; Li, Chengliang; Li, Qiulin; Xu, Bo; Liu, Wei

doi:10.1016/j.scriptamat.2018.11.002

Cited by 18 publications

(9 citation statements)

References 26 publications

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“…A typical reaction equation is given by , Similar dislocation reactions are observed during deformation of [100]- and [110]-oriented nanopillars (Figures d and h). The ⟨100⟩ dislocation is generally immobile. , Once the ⟨100⟩ dislocation forms, it blocks the motion of other dislocations, because of its immobility, which benefits the strengthening. For the [111]-oriented pillar, numerous dislocations accumulate in the distorted region (Figure l), which is similar to TEM observation in Figure i.…”

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confidence: 54%

“…Some full dislocations react with each other, forming ⟨100⟩ interstitial dislocations, as exemplified by the inset in Figure l. A typical reaction equation is given by , Similar dislocation reactions are observed during deformation of [100]- and [110]-oriented nanopillars (Figures d and h). The ⟨100⟩ dislocation is generally immobile. , Once the ⟨100⟩ dislocation forms, it blocks the motion of other dislocations, because of its immobility, which benefits the strengthening.…”

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confidence: 59%

“…The ⟨100⟩ dislocation is generally immobile. 40,41 Once the ⟨100⟩ dislocation forms, it blocks the motion of other dislocations, because of its immobility, which benefits the strengthening. For the [111]-oriented pillar, numerous Information.…”

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confidence: 99%

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Deformation Mechanisms and Remarkable Strain Hardening in Single-Crystalline High-Entropy-Alloy Micropillars/Nanopillars

et al. 2021

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There have been very limited studies on plastic deformation mechanisms in single-crystalline high-entropy alloys (HEAs) with body-centered cubic (BCC) phases. We performed in situ uniaxial compression on single-crystalline BCC AlCrFeCo-Ni micropillars/nanopillars with three orientations (including [100], [110], and [111]) and diameters of 270−1583 nm, inside a scanning electron microscope. The experimental results showed the significant size effects on yield/flow stress and the remarkable strain hardening in these HEA micropillars/nanopillars. Especially, HEA micropillars/nanopillars with ⟨100⟩ orientation exhibited higher strain hardening exponents than BCC pure metals and Al 0.7 CrCoFeNi counterparts. A combination of transmission electron microscopy observations and large-scale atomistic simulations revealed that dislocation slip, reaction, tangling and accumulation, and solid solution effects are responsible for the observed size effects on yield/flow stress and remarkable strain hardening, but these dislocation mechanisms are dependent on nanopillar orientation. Our present study sheds light on the underlying deformation mechanisms in BCC HEA single crystals.

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Deformation Mechanisms and Remarkable Strain Hardening in Single-Crystalline High-Entropy-Alloy Micropillars/Nanopillars

et al. 2021

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“…Rather, we do see in our FPA simulations that complex self-interactions between ½<111> loops result in their formation as suggested by Masters [16] decades ago. While it is uneasy to decide if these interactions involve three ½<111> loops as pointed by Wang et al [24] recently, the formation of <100> loops likely requires two as explained by Marian et al [21] and by Xu et al [22].…”

Section: Discussion: <100> Loops Nucleate From C15 Clusters and ½ <11...mentioning

confidence: 99%

“…However, using TEM, Arakawa et al [23] did not put in evidence any <100> loops while examining tens of ½<111> loops reactions. Recently, Wang et al [24] added another path for the formation of <100> loops, based on a ternary loops reaction which involves also ½<111> loops. In addition, Chen et al [25] pointed in their study that <100> loops may result from the re-arrangement and reorientation of a single crowdion cluster.…”

Section: Introduction: 2d and 3d Defects In Irradiated Bcc-ironmentioning

confidence: 99%