The localization of plastic deformation in the precipitate free zone of an Al-Mg-Si-Mn alloy

Arani, Mojtaba Mansouri; Ramesh, Naveen S.; Wang, X.; Parson, Nick; Li, M.; Poole, Warren J.

doi:10.1016/j.actamat.2022.117872

Cited by 43 publications

(5 citation statements)

References 48 publications

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“…Many researchers have pointed out that the existence of PFZs can weaken mechanical properties. [31,32] However, the discontinuities in grain boundary precipitates and the width of PFZs are almost the same for the three specimens in this study. Therefore, it is considered that the effect of PFZs on the fatigue properties of the plate should be similar.…”

Section: Initial Microstructures Of the Platementioning

confidence: 56%

High‐Cycle‐Fatigue Anisotropy of an Aluminum Alloy Superthick Plate

Wang,

Zhang,

Gong

et al. 2024

Adv Eng Mater

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The effect of anisotropy on high‐cycle fatigue (HCF) property along the rolling direction (RD) and the transverse direction (TD) of a 7××× aluminum alloy super thick plate is mainly investigated in this study. The results show a similar microstructure at different thicknesses, and the HCF properties are close as well. The fatigue fracture morphologies show that the fatigue crack sources are all located on the surfaces of the RD and TD specimens. By considering the differences in the HCF properties, there is only a slight anisotropy effect at the center thickness of the plate, which can be attributed to the tensile anisotropy caused by textures. Besides, the fatigue damage degree along the TD is slightly higher than that along the RD at the center thickness. The reason can be explained by two aspects: one is the higher probability of defect occurrence along the TD compared with that along the RD which is analyzed by the previously proposed Yield strength‐Tensile strength‐Fatigue strength model, and the other is the influence of the textures. The combination of hard and soft orientations may cause fatigue damage localization easily in the soft‐oriented grains which accelerates the fatigue failure.

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Section: Initial Microstructures Of the Platementioning

confidence: 56%

High‐Cycle‐Fatigue Anisotropy of an Aluminum Alloy Superthick Plate

Wang,

Zhang,

Gong

et al. 2024

Adv Eng Mater

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“…This phenomenon is attributed to the intergranular ductile fracture characteristic of high-strength aluminum alloys. Previous research indicates that in the fracture of precipitation hardened aluminum alloys, both transgranular ductile fracture and intergranular ductile fracture may occur [28][29][30][31]. These alloys undergo substantial precipitation of dispersed phases after the aging process, resulting in a significant increase in strength within the grains.…”

Section: Elastic-plastic Responsementioning

confidence: 99%

Ductile fracture prediction of 7A62 high-strength aluminum alloy under a wide range of stress states

Min,

Liu,

Zhou

2024

Eng. Res. Express

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The modified Gurson-Tvergaard-Needleman (GTN) model is employed to predict the ductile fracture of 7A62 high-strength aluminum alloy under a wide range of stress states. Mechanical tests were conducted on specimens with different stress states within the range of -0.33 to 1.35 stress triaxiality, including tension, notched tension, compression, and shear. The results indicate that at high stress triaxialities (0.8~1.35), the fracture mechanism is intergranular ductile fracture. Under moderate stress triaxialities (0.33~0.8), the fracture mechanism involves a combination of intergranular ductile fracture, void growth, and shear fracture. At low and negative stress triaxialities (-0.33~0.33), plastic instability occurs due to uneven stress distribution, leading to shear fracture. Fractography analysis reveals that the fractures occurring under tensile stress are associated with enriched Mn particles of approximately 200 nm. The modified GTN model accurately predicts the load-displacement response, and the fracture paths under various stress states exhibit good consistency with experimental results. This study provides reference for failure prediction in the engineering application of high-strength aluminum alloys.

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“…They can also increase the diffusivity of substitutional solute atoms through vacancy-exchange mechanisms [9][10][11][12]. Moreover, the annihilation of excess vacancies at grain boundaries (GBs) has long been considered as one of the important reasons for the formation of precipitate-free zones (PFZs) near GBs in aluminium alloys [13,14], which leads to localization of plastic strain and induces the nucleation of microcracks during deformation [15][16][17]. In light of this, it is of great importance to understand the annihilation kinetics of excess vacancies at different sinks and their spatial distribution and evolution across grains during cooling from solution treatment and during ageing heat treatments at different temperatures.…”

Section: Introductionmentioning

confidence: 99%