Revealing the atomistic nature of dislocation-precipitate interactions in Al-Cu alloys

Adlakha, I.; Garg, Pulkit; Solanki, Kiran

doi:10.1016/j.jallcom.2019.05.110

Cited by 41 publications

(12 citation statements)

References 37 publications

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“…The transmission electron microscopy and X-ray tomography images showing cut θ phase was presented in [31,32]. Cutting of θ phase was also observed in molecular dynamics (MD) studies using realistic models of interatomic interaction [33][34][35]. Depending on the aging conditions, the size of released θ precipitates can vary significantly, starting from a few nanometers in diameter and reaching hundreds of nanometers [23,32,36,37].…”

Section: Introductionmentioning

confidence: 87%

“…The interaction of dislocations with nano-sized inclusions in the Al-Cu system was studied by a number of authors using MD modeling [33][34][35][57][58][59][60][61][62][63]. It was demonstrated that even for the same type of inclusion, different mechanisms of overcoming are realized, for example, for single-layer GP zones, an increase in precipitate diameter leads to the realization of Orowan looping instead of cutting mechanisms [58]; also, it was demonstrated in [61] that a change in the mechanism can occur even for one size of precipitate, but at different temperatures and strain rates.…”

Section: Introductionmentioning

confidence: 99%

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Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling

et al. 2021

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We investigate the prolonged plastic deformation of aluminum containing θ’ phase with a multistage approach combining molecular dynamics (MD), continuum modeling (CM) and discrete dislocation dynamics (DDD). The time of performed MD calculations is sufficient for about a hundred dislocation–precipitate interactions. With this number of interactions, the inclusion of θ’ is not only cut, but also scattered into individual copper atoms in an aluminum matrix. Damage to the crystal structure of inclusion and activation of the cross-slip of dislocation segments cause a decrease in acting stresses in the MD system. The rate of this effect depends on θ’ diameter and occurs faster for small inclusions. The effect of decreasing the resistance of precipitate is further introduced into the dislocation–precipitate interaction CM by reducing the precipitate effective diameter with an increase in the number of interactions. A model of dislocation–precipitate interaction accounting for the softening of inclusions is further implemented into DDD. Dependences of flow stress in aluminum with θ’ phases on volume fraction and typical diameter of precipitates are obtained. Manifestation of inclusion softening is possible in such an alloy, which leads to the flow stress decrease during deformation. The range of volume fractions and typical diameters of θ’ phases corresponding to the possible decrease in flow stress is distinguished.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling

et al. 2021

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“…However, as compared with Al 4 C 3 which was easily produced at the defect site, the formation of Al 2 Cu [36] or Al 3 Ni [22] through the reaction of the Al grains with the modified particles of GNSs would not consume the carbon components, so that the structural integrity of GNSs could be maintained well. For another thing, a large amount of in situ formed Al 2 Cu as well as GNS-Cu hybrid layers would play crucial roles in serving as effective barriers to dislocation motion, thus hardening the Al matrix [48,49].…”

Section: Microhardness and Elastic Modulusmentioning

confidence: 99%

Al matrix composites reinforced by in situ synthesized graphene–Cu hybrid layers: interface control by spark plasma sintering conditions

Mesguich

Estournès

et al. 2022

J Mater Sci

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Tremendous impacts are usually made by the synthesis method and consoli dation technique on microst ructure and interface of graphene/ Al composites. In the present work, an in situ gel-precursor decomposition route is proposed for the one-step synthesis of graphene nanosheet (GNS) decorated with Cu nanoparticles in the form of hybrid layers encapsulating Al grains (designated as GNS-Cu/ Al). Consolidation is performed by spark plasma sintering (SPS) using markedly different sets of maximum temperature and maximum uniaxial pressure (400 °C/400 MPa or 500 °C/100 MPa). The powder and dense samples are investigated by several techniques including thermal analysis, X-ray diffraction and electron microscopy. The microhardness and elastic modulus of selected GNS-Cu/ Al composites are investigated and related to the microstructure and preparation conditions. Results demonstrate that the inter face structure is primarily determined by the roles of GNS-Cu hybrid layers and finely controlled by SPS conditions. This work paves a navel way to elucidate the evolutions of metal-decorated graphene hybrids in Al matrix composites.

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“…After certain treatment period (over aging), the incoherent h-Al 2 Cu phase is a more thermodynamically stable phase, and due to over aging, the mechanical strength is decreased, as previously reported. [40][41][42][43][44][45][46] Shin et al 45 and Adlakha et al 46 have reported that a coherent interfacial energy of the h' or h" phases (more prevalent at initial treatment) are lower than an incoherent h phase.…”

Section: Effect Of Distinct Heat-treating On Tensile Strengthmentioning

confidence: 99%

Distinct heat treatments and powder size ratios affecting mechanical responses of Al/Si/Cu composites

Satizabal

Caurin

Meyer

et al. 2021

Journal of Composite Materials

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The aim in this investigation is focused on the evaluation of two distinctive powder size ratios of pure elements (Al, Si and Cu) powders. Heat treatments (T4 and T6) affecting the mechanical strengths of Al/Si/Cu composites are also investigated. The novelty concerns to pure elements to constituting the composites and no melting or stir casting route are used. It is found that the densifications and tensile strengths are similar when distinct powder size ratios are used. It is also found that T4 and T6 treatments increases and decreases the mechanical strengths, respectively. The Si content indicates a deleterious effect in mechanical behavior. The T6 aging provides θ-Al2Cu incoherent with Al matrix, and the compressive strength is decreased. This suggests that the examined Al/Cu composites (using pure powders) are potential materials considering economical and environmentally friendly aspects.

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Revealing the atomistic nature of dislocation-precipitate interactions in Al-Cu alloys

Cited by 41 publications

References 37 publications

Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling

Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling

Al matrix composites reinforced by in situ synthesized graphene–Cu hybrid layers: interface control by spark plasma sintering conditions

Distinct heat treatments and powder size ratios affecting mechanical responses of Al/Si/Cu composites

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