Motion of [100]-tilt grain boundaries under cyclic stresses

Syed, B.; Li, Xiaowu; Winning, Myrjam

doi:10.1016/j.msea.2006.10.047

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…Furthermore, as shown in Figure 11 a, the GB migration was mostly found between the two grains with different contrasts under bright field image, indicating that these grains are highly misoriented. That is to say, the GB migration occurs more easily when the misorientation of neighboring grains is high, which is quite consistent with the results reported by Badirujjaman et al [ 33 ]. The microstructures of the specimens fatigued at 140 MPa and 200 MPa are shown in Figure 11 e–h.…”

Section: Resultssupporting

confidence: 92%

“…The migration of GBs can occur as suffering from static or dynamic loading, thus influencing the mechanical properties of a material [ 30 ]. Besides, the GB migration behavior in different materials under various temperatures and loading conditions has been widely reported [ 31 , 32 , 33 , 34 ]. The drive force of GB migration can be attributed to the different free energies across the GB due to several factors such as cold-working, boundary curvature, misorientation, or non-uniform stress states [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

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Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

et al. 2016

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Fatigue properties and cracking behavior of cold-drawn commercially pure aluminum wires (CPAWs) widely used as the overhead transmission conductors were investigated. It was found that the fracture surface of the CPAWs shows an obvious four-stage fracture characteristic, i.e., crack initiation, planar crack propagation, 45 • -inclined crack propagation and final rapid fracture. The crack growth mechanisms for the CPAWs were found quite different from those for the conventional coarse-grained materials. The cracks in the CPAWs firstly grow along the grain boundaries (Stage I crack growth), and then grow along the plane of maximum shear stress during the last stage of cycling (Stage II crack growth), leading to the distinctive fracture surfaces, i.e., the granular surface in the planar crack propagation region and the coarse fatigue striations in the 45 • -inclined crack propagation region. The grain boundary migration was observed in the fatigued CPAWs. The increase in fatigue load enhances the dislocation recovery, increases the grain boundary migration rate, and thus promotes the occurrence of softening and damage localization up to the final failure.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

et al. 2016

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“…In particular, translational GB motion coupled to a normal motion was considered to be the main mechanism responsible for the grain coarsening and plasticity in crystalline metals, i.e. under nanoindentation [10,11], tension [4,[12][13][14][15][16] and shear [17,18]. Based on a simple bicrystal model containing an isolated GB, Cahn and Taylor [19] have proposed the following equation to describe the pure coupled GB motion under applied shear stress:…”

Section: Introductionmentioning

confidence: 99%

Influences of triple junctions on stress-assisted grain boundary motion in nanocrystalline materials

Aramfard¹,

Deng

2014

Modelling Simul. Mater. Sci. Eng.

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Stress-assisted grain boundary motion is among the most studied modes of microstructural evolution in crystalline materials. In this study, molecular dynamics simulations were used to systematically investigate the influences of triple junctions on the stress-assisted motion of symmetric tilt grain boundaries in Cu by considering a honeycomb nanocrystalline model. It was found that the grain boundary motion in nanocrystalline models was highly sensitive to the loading mode, and a strong coupling effect which was prevalent in bicrystal models was only observed when simple shear was applied. In addition, the coupling factor extracted from the honeycomb model was found to be larger and more sensitive to temperature change than that from bicrystal models for the same type of grain boundary under the same loading conditions. Furthermore, the triple junctions seemed to exhibit unusual asymmetric pinning effects to the migrating grain boundary and the constraints by the triple junctions and neighboring grains led to remarkable non-linear grain boundary motion in directions both parallel and normal to the applied shear, which was in stark contrast to that observed in bicrystal models. In addition, dislocation nucleation and propagation, which were absent in the bicrystal model, were found to play an important role on shear-induced grain boundary motion when triple junctions were present. In the end, a generalized model for shear-assisted grain boundary motion was proposed based on the findings from this research.

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“…Rapid replating of a few monolayers of aluminum will trap vacancies and effectively inject vacancies into the matrix grain boundaries, dramatically increasing their mobility, allowing for unexpected grain boundary sliding. Fatigue of aluminum has shown dynamic tendencies of grain boundary motion [17] that arise from the flux of vacancies known to be generated by decomposition and recreations of dislocation cell structures. This vacancy flux, combined with any hydrogen effects, will contribute to the fracture of matrix boundaries between the locations of b-phase platelike particles developing on the grain boundaries in the early stages of precipitation.…”

Section: Jie Gao and David J Quesnelmentioning

confidence: 99%

Enhancement of the Stress Corrosion Sensitivity of AA5083 by Heat Treatment

Quesnel

2010

Metall Mater Trans A

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In this study, the stress corrosion cracking (SCC) resistance of AA5083 is intentionally degraded by a series of progressively longer annealing treatments at 448 K (175°C) that create a two-phase microstructure. Precipitation of strongly anodic Mg 2 Al 3 , known as b-phase, occurs heterogeneously with substantial precipitation along the grain boundaries, as observed by differential interference microscopy. Ultimate tensile strength, yield strength, and strain to failure of AA5083 alloy were found to be independent of the amount of b-phase precipitates, making AA5083 an ideal system to study the relative contributions of anodic dissolution and hydrogen embrittlement. Open circuit dropwise exposure SCC tests with precracked double cantilever beam (DCB) specimens made from the AA5083 alloy with different heat treatment conditions were conducted using 3.5 pct NaCl solution at an initial stress intensity factor (K I ) of 15 ksi ffiffiffiffi in p: 16:5 MPa ffiffiffiffi m p ð Þ : Two SCC characteristics, initial crack growth rate and incubation time, were found to be strongly dependent on the amount of b-phase precipitates. Initial crack growth rate increased sigmoidally as a function of heat treatment time with an inflection point between 120 and 240 hours of sensitization time, while the incubation time decreases monotonically with sensitization time. Additionally, fracture surfaces investigated by scanning electron microscopy demonstrated characteristics of intergranular cracking with multiple crack tips. Discussion centers on the evidence supporting anodic dissolution of b-phase grain boundary precipitates as a primary mechanism of SCC in severely sensitized AA5083 alloy and the potential contribution of hydrogen embrittlement in the failure of grain boundary ligaments between b-phase grain boundary precipitates in less severely sensitized conditions.

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Motion of [100]-tilt grain boundaries under cyclic stresses

Cited by 6 publications

References 24 publications

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire

Influences of triple junctions on stress-assisted grain boundary motion in nanocrystalline materials

Enhancement of the Stress Corrosion Sensitivity of AA5083 by Heat Treatment

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