Mechanical behavior and deformation mechanism of 7075 aluminum alloy under solution induced dynamic strain aging

Zhou, Pu; Song, Yanli; Lin, Hua; Lu, Jue; Zhang, Jiaheng; Wang, Feng

doi:10.1016/j.msea.2019.05.071

Cited by 66 publications

(16 citation statements)

References 29 publications

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“…It shows that, after the elastic deformation, the stress rises slowly with the strain, indicating a weak strain-hardening ability of the material. A similar mechanical response has also been found in other 7XXX aluminum alloys [12,13].…”

Section: Resultssupporting

confidence: 84%

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

2021

Discrete Dynamics in Nature and Society

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The mechanical behavior of the extruded 7003-T6 aluminum profiles used as automotive buffer beams is investigated. The correlation of the texture and the formation of the adiabatic shear band is analyzed. Copper texture, R texture, and S texture are the main reasons for the anisotropy of mechanical behavior of the profile, resulting in that the stress of the profile along the extrusion direction is higher than that perpendicular to the extrusion direction. Through finite element modeling (FEM), it can be found that the adiabatic shear band is developed in the sample if the dynamic loading direction is parallel to the extrusion direction, but it does not appear if the loading direction is perpendicular to the extrusion direction. When the dynamic loading direction is parallel to the extrusion direction, higher stress results in a lower energy barrier for shear localization. Therefore, the formation of the adiabatic shear band is susceptible along but is not sensitive perpendicular to the extrusion direction. This study provides technical support for the service of 7003 aluminum alloy in automobiles, which has important academic and engineering application value.

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Section: Resultssupporting

confidence: 84%

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

2021

Discrete Dynamics in Nature and Society

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“…It can be seen that uniform elongation of the sample treaded by D-EST is 23.2%, whereas that treated by SST is only 22.1%. From the local magnification image, the Portevin-Le Chatelier (PLC) effect resulting from dynamic strain aging (DSA) [16] can be observed.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties Improvement of AlZnMgCu Alloys Induced by a Novel Double Electroshocking Treatment

et al. 2020

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Herein, a novel solution method of AlZnMgCu alloy using double electroshocking treatment (D‐EST) is proposed. Compared with the conventional solid solution treatment (SST) at 475 °C for 30 min, this method can provide more desirable results, although it only takes 10.2 s. Single tensile test results show that the ultimate strength and elongation after D‐EST followed by T6 aging are, respectively, increased by 2.6% and 6.8% relative to that of SST. In addition, the microstructure of the alloy after D‐EST and SST is characterized by the scanning electron microscopy, transmission electron microscopy, and electron backscattering diffraction (EBSD). The experimental results reveal that D‐EST can give rise to more adequate dissolution of secondary phases especially intermetallic compounds and long rod‐shaped dispersion phase, finer grains, and fewer grain boundaries in the range of 5°–8°. The kinetic mechanism of D‐EST is interpreted from the point of view of electromigration and the nonuniform distribution of temperature on the microscale.

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“…The PLC mechanism is normally associated with dynamic strain aging (DSA), i.e., pinning of dislocations by impurity atoms and alloying solutes during deformation, while dislocations are blocked on obstacles [12][13][14][15]. A number of studies were devoted to the classification of the PLC effect into three major types: according to the jerky flow of the deformation curve [16,17], according to the regularities in distribution of the stress oscillation magnitudes [18,19], and according to the behavior of the deformation bands [20][21][22]. Type A behavior is characterized by an increase in the flow stress followed by a drop to or below the general stress level and a repetitive continuous propagation of deformation bands.…”

Section: Introductionmentioning

confidence: 99%

On the mechanisms of nucleation and subsequent development of the PLC bands in an AlMg alloy

Yuzbekova

Mogucheva

Borisova

et al. 2021

Journal of Alloys and Compounds

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The nucleation and subsequent development of the Portevin-Le Chatelier bands during tensile deformation in a binary AlMg alloy was investigated by the digital image correlation technique. The following states of the material were employed for the current investigation: coarse-grained (CG), fine-grained (FG) after equal channel angular pressing (ECAP), severely strained (SS) after ECAP followed by cold rolling. Special attention was paid to the nucleation of an embryo band by maximizing the contrast of the deformation images. Particular spatiotemporal patterns of the alloy in three different conditions, testifying to the initiation of an embryo band having a wedge shape on the lateral surface of the specimen, were obtained at high and intermediate strain rates. The evaluation of the serration amplitude and the band velocity showed that the dependence of these values on strain consists of two stages (the linear growth-up/drop stage and the steady-state stage) for CG materials and only one stage (the linear growth-up/drop stage) for FG materials. The nucleation of deformation bands always occurs according to a mixed mechanism, in which the thickening of the embryo slows down with a decrease in the strain rate.

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Mechanical behavior and deformation mechanism of 7075 aluminum alloy under solution induced dynamic strain aging

Cited by 66 publications

References 29 publications

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

The Correlation of Texture and the Formation of the Adiabatic Shear Band in 7XXX Aluminum Alloy during Dynamic Loading

Microstructure Evolution and Mechanical Properties Improvement of AlZnMgCu Alloys Induced by a Novel Double Electroshocking Treatment

On the mechanisms of nucleation and subsequent development of the PLC bands in an AlMg alloy

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