Aluminum Σ3 grain boundary sliding enhanced by vacancy diffusion

Du, Ningning; Qi, Yue; Krajewski, Paul E.; Bower, Allan F.

doi:10.1016/j.actamat.2010.04.016

Cited by 24 publications

(7 citation statements)

References 31 publications

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“…[31] Doping GB with vacancies can increase the mobility of the atoms at the GB and induce GB premelting, thus lowering GBS threshold stress. [47] Si impurities seem to enhance GBS by a similar process.…”

Section: A Gb Mobility and Slidingmentioning

confidence: 84%

The Effect of Solute Atoms on Aluminum Grain Boundary Sliding at Elevated Temperature

Krajewski

et al. 2010

Metall Mater Trans A

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Grain boundary sliding (GBS) is an important deformation mechanism for elevated temperature forming processes. Molecular dynamics simulations are used to investigate the effect of solute atoms in near grain boundaries (GBs) on the sliding of Al bicrystals at 750 K (477°C). The threshold stress for GBS is computed for a variety of GBs with different structures and energies. Without solute atoms, low-energy GBs tend to exhibit significantly less sliding than high-energy GBs. Simulation results show that elements which tend to phase segregate from Al, such as Si, can enhance GBS in high-energy GBs by weakening Al bonds and by increasing atomic mobility. In comparison, intermetallic forming elements, such as Mg, will form immobile Mg-Al clusters, decrease diffusivity, and inhibit GBS.

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Section: A Gb Mobility and Slidingmentioning

confidence: 84%

The Effect of Solute Atoms on Aluminum Grain Boundary Sliding at Elevated Temperature

Krajewski

et al. 2010

Metall Mater Trans A

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“…These simulations also revealed a lack of the sudden atomic rearrangements at the boundary, a phenomenon found via the density functional theory simulations by Molteni et al [ 37 ] MD simulations by Du et al of high angle Al grain boundaries under simple shear at 750 K calculated critical stresses to induce grain boundary sliding to be as low as 20 MPa and that the presence of vacancies decreased this critical stress. [ 38 ] While molecular dynamics simulations may be useful in understanding these experimental results, some do not account for effects of temperature and most are limited by their system size, computational cost, and unrealistic strain rates such that they may not be representative of the actual material behavior.…”

Section: Discussionmentioning

confidence: 99%

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

Aitken¹,

Jang²,

Weinberger³

et al. 2013

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Room-temperature uniaxial compressions of 900-nm-diameter aluminum bi-crystals, each containing a high-angle grain boundary with a plane normal inclined at 24° to the loading direction, revealed frictional sliding along the boundary plane to be the dominant deformation mechanism. The top crystallite sheared off as a single unit in the course of compression instead of crystallographic slip and extensive dislocation activity, as would be expected. Compressive stress strain data of deforming nano bicrystals was continuous, in contrast to single crystalline nano structures that show a stochastic stress strain signature, and displayed a peak in stress at the elastic limit of ~ 176 MPa followed by gradual softening and a plateau centered around ~ 125 MPa. An energetics-based physical model, which may explain observed room-temperature grain boundary sliding, in presented, and observations are discussed within the framework of crystalline nano-plasticity and defect microstructure evolution.

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“…This conclusion was supported by a large number of studies on thermally activated GB sliding that showed that faster GB sliding occurred due to higher GB self-diffusion rates, which correlated with GB energy and GB volume. Du et al [69] used the MD simulation method at a temperature of 750 K to investigate the effect of vacancies that near the boundary area on the sliding of Al bicrystals. They found that without vacancies, low energy R3 GB exhibited much less sliding than other high energy GBs.…”

Section: Grain Boundary Slidingmentioning

confidence: 99%

A review on atomistic simulation of grain boundary behaviors in face-centered cubic metals

Zhang

Lü

Tieu

2016

Computational Materials Science

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Aluminum Σ3 grain boundary sliding enhanced by vacancy diffusion

Cited by 24 publications

References 31 publications

The Effect of Solute Atoms on Aluminum Grain Boundary Sliding at Elevated Temperature

The Effect of Solute Atoms on Aluminum Grain Boundary Sliding at Elevated Temperature

Grain Boundary Sliding in Aluminum Nano‐Bi‐Crystals Deformed at Room Temperature

A review on atomistic simulation of grain boundary behaviors in face-centered cubic metals

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