Thermal-mechanical loading sequences related creep aging behaviors of 7050 aluminum alloy

Lei, Chao; Li, Hengyun; Zheng, G.W.; Fu, Jiawei

doi:10.1016/j.jallcom.2017.10.035

Cited by 25 publications

(7 citation statements)

References 29 publications

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“…Spigarelli and Sandstrom [25] presented basic creep modelling of the pure aluminum, which was compared to experimental data. Lei et al [26] investigated thermalmechanical loading sequences related creep ageing behaviors of the 7050 aluminum alloy. They showed that the alternative of the ageing furnace or the autoclave could cause inverse thermal-mechanical loading sequences, including loading prior to heating in the ageing furnace or heating prior to loading in the autoclave.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on Creep and Fracture Behaviors of Nano-SiO2-composite and AlSi12Cu3Ni2MgFe Aluminum Alloy

Azadi

Aroo

2020

IJE

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In the presented article, the temperature effect was studied on creep properties and fracture behaviors of AlSi12Cu3Ni2MgFe aluminum-silicon alloys, unreinforced and reinforced with SiO2 nano-particles. For such objective, standard specimens were fabricated by gravity casting and stir-casting methods, for aluminum alloys and nano-composites, respectively. Then, force-controlled creep testing was performed on standard specimens at 250, 275 and 300°C, under 100 MPa. Then, to find failure mechanisms, the fracture surface of test samples was also analyzed by the field emission scanning electron microscopy. Experimental results depicted the temperature changed creep behaviors of both materials, effectively. Moreover, a significant improvement in creep properties was observed by reinforcing the aluminum matrix with nano-particles, besides a heat treatment process. Such an increase in the creep lifetime was higher at 300°C. In addition, the fracture surface investigation of both materials implied the same brittle behavior, with quasi-cleavage marks. The failure location changed from inside the intermetallic phase into boundaries of the intermetallic phase in the nano-composite.

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Section: Introductionmentioning

confidence: 99%

Temperature Effect on Creep and Fracture Behaviors of Nano-SiO2-composite and AlSi12Cu3Ni2MgFe Aluminum Alloy

Azadi

Aroo

2020

IJE

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“…3c). Compared with previous studies [10][11][12][13], the role of precipitated phase during SPD process was deeply considered in this study. It is found from Figs.…”

Section: Resultsmentioning

confidence: 99%

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Zhang

Qiu

De-sheng

et al. 2018

Micro & Nano Letters

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Al-Mg-Si alloy was treated through high-frequency impacting and rolling. Microstructures of different deformation layers were observed by transmission electron microscopy. The interaction mechanism between precipitated phase and dislocations for different deformation layer was studied. A detailed schematic of coordinated deformation dislocation mechanism around precipitated phase was established. Results show that lots of coordinated deformation dislocations are formed around the precipitated phase which is far away from the treated surface. With the decrease of distance from the treated surface, dislocation motion is blocked and dislocation lines gradually intersect, which speed up the segmentation and refinement of grains.

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“…With the increase of pre-stretching amount, compared with that in Figure 7d, there is more number of and coarser η phases distributing dispersively in grains (see Figure 7e), however, it is little by little thatή phase diminishes and nearly vanishes. This is due to the fact that the demand of volume free energy to form η phase (as an equilibrium phase) is greater than that ofή phase (as a metastable phase) [21]. Meanwhile, the trap for vacancies annihilation may be caused by the dislocations generated by pre-stretching, with a decrease of vacancy amount.…”

Section: Metals 2019 9 X For Peer Review 7 Of 13mentioning

confidence: 99%

Effect of Pre-Stretching on Microstructures and Mechanical Behaviors of Creep-Aged 7055 Al Alloy and Its Constitutive Modeling

Zuo

Cao

et al. 2019

Metals

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The rational pre-stretching can contribute to obtaining better mechanical properties. This paper studies the effect of creep stain, mechanical properties, and microstructures of 7055 alloy under different pre-stretching conditions. The results show that compared with solid-quenched alloy, the 7055-T6 alloy is the optimal scheme to attain more creep strain, and the range of pre-stretching from 1.6% to 3.3% is suitable for creep-aged 7055-T6 alloy to obtain better mechanical properties. Further examination by TEM test shows that pre-stretching promotes the formation of dislocations, which provides superior nucleation regions for ή phase resulting in a higher strength alloy. Meanwhile, a unified creep-aging constitutive model for 7055-T6 alloy is established which can be used to accurately predict its creep behavior under the different pre-stretching.

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Thermal-mechanical loading sequences related creep aging behaviors of 7050 aluminum alloy

Cited by 25 publications

References 29 publications

Temperature Effect on Creep and Fracture Behaviors of Nano-SiO2-composite and AlSi12Cu3Ni2MgFe Aluminum Alloy

Temperature Effect on Creep and Fracture Behaviors of Nano-SiO2-composite and AlSi12Cu3Ni2MgFe Aluminum Alloy

Effect of precipitated phase on dislocation activity under high‐frequency impacting and rolling

Effect of Pre-Stretching on Microstructures and Mechanical Behaviors of Creep-Aged 7055 Al Alloy and Its Constitutive Modeling

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