Interaction mechanism of an edge dislocation with a void in Fe–Ni–Cr concentrated solid-solution alloy

Dou, Yajie; Cao, Han; He, Xinfu; Gao, Jianjun; Cao, Jinli; Yang, Wen

doi:10.1016/j.jallcom.2020.157556

Cited by 18 publications

(12 citation statements)

References 42 publications

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“…Moreover, both alloys have random atoms in nature Here, the effect of local atom distributions on the SFE was investigated. As earlier stated in section 2.2, the role of the local SFE distributions can be carried out by varying the element arrangement using different random seeds in the simulation as implemented in [14][15][16][17][18]. The SFE distribution is estimated with a Gaussian distribution given as:…”

Section: Investigation Of the Stacking Fault Energymentioning

confidence: 99%

“…Recent works have shown that some single-phase High Entropy Alloys (HEA) exhibit excellent mechanical properties, radiation-resistance properties and phase stability making them potential candidates for structural applications [1][2][3][4][5][6][7][8][9][10]. However, many authors have traced the origin of these properties to the specific behaviour of dislocations [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Face-Centered Cubic (FCC) HEA, such as Cantor alloy consisting of equimolar CoCrFeMnNi composition exhibits excellent mechanical properties and improved irradiation resistance [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomistic investigation of elementary dislocation properties influencing mechanical behaviour of Cr15Fe46Mn17Ni22 alloy and Cr20Fe70Ni10 alloy

Daramola

Frączkiewicz

Bonny

et al. 2022

Computational Materials Science

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Section: Investigation Of the Stacking Fault Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomistic investigation of elementary dislocation properties influencing mechanical behaviour of Cr15Fe46Mn17Ni22 alloy and Cr20Fe70Ni10 alloy

Daramola

Frączkiewicz

Bonny

et al. 2022

Computational Materials Science

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“…Interactions between atoms in the equiatomic, ternary solid solution FeNiCr were modelled using the embedded atom method (EAM) potential by Bonny et al [23] that was fitted to reproduce the properties of individual elements as well as the SFE and elastic properties of different alloy compositions. This EAM potential has been successfully used for the study of dislocations in concentrated solid solution alloys (CSSAs), e.g., in [10,24,25]. The random CSSA samples were generated by randomly placing atoms of the different constituent elements on a regular fcc grid.…”

Section: Competing Interestsmentioning

confidence: 99%

Pinning of extended dislocations in atomically disordered crystals

Vaid¹,

Wei²,

Bitzek³

et al. 2021

Preprint

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In recent years there has been renewed interest in the behavior of dislocations in crystals that exhibit strong atomic scale disorder, as typical of compositionally complex single phase alloys. The behavior of dislocations in such crystals has been often studied in the framework of elastic manifold pinning in disordered systems. Here we discuss modifications of this framework that may need to be adapted when dealing with extended dislocations that split into widely separated partials. We demonstrate that the presence of a stacking fault gives rise to an additional stress scale that needs to be compared with the pinning stress of elastic manifold theory to decide whether the partials are pinned individually or the dislocation is pinned as a whole. For the case of weakly interacting partial dislocations, we demonstrate the existence of multiple metastable states at stresses below the depinning threshold and analyze the stress evolution of the stacking fault width during loading. In addition we investigate how geometrical constraints can modulate the dislocation-solute interaction and enhance the pinning stress. We compare our theoretical arguments with results of atomistic and discrete (partial) dislocation dynamics (D(P)DD) simulations.

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“…[14,15] Many simulations have been carried to explore the interaction between dislocations and these irradiation-induced defects, especially voids and Frank loops, in pure metals or alloys. [16][17][18][19][20][21][22] As for voids, the effects of stacking fault energy (SFE), void size, and temperature on their reaction with dislocations were studied in Cu, and the jog was found to form after their reaction. [16] It was also found that voids can transfer to SFTs in Fe-10Ni-20Cr alloys after interacting with dislocations at 900 K, which leads to a sharp increase in the value of critical resolved shear stress (CRSS).…”

Section: Introductionmentioning

confidence: 99%

“…[16] It was also found that voids can transfer to SFTs in Fe-10Ni-20Cr alloys after interacting with dislocations at 900 K, which leads to a sharp increase in the value of critical resolved shear stress (CRSS). [17] As for Frank loops, after reacting with dislocations, it was shown that the original unpinning effects occur in Cu, [18] as well as the "superjogs" form after interacting with edge dislocations. Besides, "helical turns" happened on Frank loops after interacting with screw dislocations in Fe-10Ni-20Cr alloys, which may be a prerequisite for the formation of defect-free channels.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of interactions between edge dislocation and irradiation-induced defects in Fe–10Ni–20Cr alloy

Xiong¹,

Chen²,

Lin³

et al. 2023

Chinese Phys. B

Self Cite

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Irradiation-induced defects often hinder the slip of dislocations, which will make the performance of structural materials of nuclear reactor drop sharply, especially for core structural materials. In present work, molecular dynamics method is used to investigate the interactions between edge dislocations and three typical irradiation-induced defects (Void, Frank loop and Stacking fault tetrahedron) with the sizes of 3, 5, and 7 nm at different temperatures in Fe-10Ni-20Cr alloy. The critical resolved shear stress (CRSS) was compared among different defect types after interacting with edge dislocations. The results show that the CRSS decreases with increasing temperature and decreasing defect size for all defect types during the interaction with edge dislocations, except for the case of Frank loops with 3nm at 900 K. By comparison, the CRSS in Frank loops is significantly higher than that of others for the same size, which is due to the occurrence of unfaulting and formation of superjog or stacking-fault complex during the interaction. The atomic evolution of irradiation-induced defects after interacting with dislocations could provide novel insights for the design of new structural materials.

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Interaction mechanism of an edge dislocation with a void in Fe–Ni–Cr concentrated solid-solution alloy

Cited by 18 publications

References 42 publications

Atomistic investigation of elementary dislocation properties influencing mechanical behaviour of Cr15Fe46Mn17Ni22 alloy and Cr20Fe70Ni10 alloy

Atomistic investigation of elementary dislocation properties influencing mechanical behaviour of Cr15Fe46Mn17Ni22 alloy and Cr20Fe70Ni10 alloy

Pinning of extended dislocations in atomically disordered crystals

Molecular dynamics study of interactions between edge dislocation and irradiation-induced defects in Fe–10Ni–20Cr alloy

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