Dynamics of edge dislocation in Cu–Ni solid solution alloys at atomic scale

Bryukhanov, I. A.

doi:10.1016/j.ijplas.2020.102834

Cited by 38 publications

(10 citation statements)

References 69 publications

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“…[ 39 ] It is generally understood that the existence of solute atoms increases the onset threshold stress of barrier‐free dislocation motion. [ 40 ] The morphologies of the dislocations at the moment when the average shear stress reaches the CRSS are shown in Figure 4 and 5 . The Al atoms are hidden.…”

Section: Resultsmentioning

confidence: 99%

“…The strengthening caused by solute atoms is affected by temperature. [ 40 ] It is well known that the increase in temperature reduces the strengthening effect of solute atoms, which has been demonstrated experimentally. [ 41 ] To verify the applicability of the Equation (8) at different temperatures, systems with different concentrations of solute atoms are simulated at 100 and 500 K, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Molecular Dynamics Simulation of Solution Strengthening of Si and Cu Atoms in Aluminum Alloy

Kong

Zhang

2023

Physica Status Solidi (b)

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For heat‐treatable aluminum alloys, solid solute elements play key role in material strengthening. Al–Mg–Si alloy is a typical heat‐treatable alloy; Cu and Si atoms are its main solid solution atoms. To reveal the strengthening mechanism, the interaction between the edge dislocations and the Cu and Si solute atoms of different concentration in aluminum matrix is investigated by molecular dynamics (MD) simulation. Results indicate that Cu atoms provide a more effective strengthening due to the stronger pinning effect. The increment of critical resolved shear stress (ΔCRSS) is a function of concentration of solid solute atoms. When more than two types of solid solution atoms coexist in matrix, the final increment of the ΔCRSS is determined by the interactive effects of the atoms instead of the direct sum of all items. The pinning of Cu solid solute atoms can lead to two Shockley partial dislocations merging to an edge dislocation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Molecular Dynamics Simulation of Solution Strengthening of Si and Cu Atoms in Aluminum Alloy

Kong

Zhang

2023

Physica Status Solidi (b)

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Section: Resultsmentioning

confidence: 99%

“…However, when interstitial oxygen is added (Figure 6c–f), the degree of bending after dislocation movement shows no significant difference under low and high stresses, thus implying that the degree of bending is almost unaffected by the solute‐induced stress field. [ 23 ]…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the effect of oxygen atom concentration on the velocity of dislocation movement at high temperature is much smaller than that at low temperature. Similarly, molecular dynamics simulations of Cu-Ni solid solution alloys revealed that the dislocation mobility is almost unaffected by the solute atom concentration at temperatures above 700 K. [23] The interstitial atoms increase the threshold stress at which dislocation movement begins, and this effect is known as solid solution strengthening. [24] As shown in Figure 4, the critical resolved shear stress (CRSS) at which dislocation movements begin gradually increases with the increase of oxygen content at the same temperature, indicating that the oxygen atoms obstruct the initiation of dislocation movement.…”

Section: Resultsmentioning

confidence: 99%

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Dynamics of Edge Dislocation in Ti–O Single Crystal Alloys at the Atomic Scale

Ren

Shao

Wang

et al. 2022

Physica Status Solidi (b)

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The addition of oxygen atoms in solid solution to α‐Ti alloy can increase not only its hardness but also its brittleness. Herein, the edge dislocation mobility of Ti–O single crystals at oxygen concentrations of 0–2 at% and temperatures of 100–900 K is investigated by molecular dynamics simulations. The results show that the interstitial oxygen atoms have a strong hindering effect on the a/3 [11true2¯0] edge dislocations on the {true1¯100} prismatic planes, which is attributed to the pinning effect of the vacancy clusters on the dislocation movement due to the interstitial oxygen atoms, thus leading to pronounced dislocation strengthening and hardening. The critical resolved shear stress (CRSS) for dislocation movement increases with increasing oxygen content and decreases with increasing temperature. Moreover, the effect of oxygen concentration on dislocation mobility also diminishes with increasing temperature.

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