Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation

Gruber, Belinda; Grabner, Florian; Fragner, Werner; Schökel, Alexander; Spieckermann, Florian; Uggowitzer, Peter J.; Pogatscher, Stefan

doi:10.3390/ma13030554

Cited by 8 publications

(2 citation statements)

References 33 publications

(67 reference statements)

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“…It is an innovation and extension of traditional heat treatment, placing the parts to be treated in a specific and controllable low-temperature environment, causing changes in the material's microstructure, thereby improving its comprehensive performance. This includes residual stress, machinability, wear resistance and mechanical properties of Al-Mg-Si aluminum alloy [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Qiu,

Tang,

Tian

et al. 2024

Coatings

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This study investigates the impact of cryogenic treatment duration on the mechanical properties and microstructural evolution of 6082 aluminum alloy subjected to subsequent artificial aging. Tensile tests were conducted using an electronic universal testing machine, and the microstructure was characterized by employing optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that both the tensile strength and elongation of the alloy first increase and then decrease with the extension of cryogenic treatment duration. The alloy treated with 12 h of cryogenic treatment followed by artificial aging at 180 °C for 8 h achieved a peak strength of 390 MPa. Meanwhile, the alloy treated with 8 h of cryogenic treatment and the same artificial aging process reached a maximum elongation of 13%. All specimens of 6082 aluminum alloy subjected to cryogenic and aging treatments exhibited ductile fracture under room temperature tensile conditions. The size of dimples at the fracture surface first increased and then decreased with increasing cryogenic treatment duration, indicating a transition from deeper to shallower dimples. The cryogenic treatment did not significantly affect the grain size of the alloy, which remained approximately 230 µm on average. Cryogenic treatment facilitated the precipitation of fine, densely distributed precipitates, enhancing the pinning effect of dislocations and thus improving the tensile strength. Additionally, cryogenic treatment increased the dislocation density and promoted the formation of subgrains, while the grain boundary precipitates transitioned from a continuous to a discontinuous distribution, all of which contribute to the enhancement of the plasticity.

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Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Qiu,

Tang,

Tian

et al. 2024

Coatings

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show abstract

“…The effect of pre-deformation on subsequent artificial aging has been extensively studied for many heat treatable aluminum alloys [4][5][6][7][8][9][10][11]. The results show that pre-deformation can be positive or negative on the mechanical properties of aluminum alloys depending on the alloy composition, precipitate types and deformation parameters [9,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Simulation Study for the Influence of Thermal Pre-Deformation on Subsequent Aging Precipitation Kinetics of Al-Zn-Mg-Cu Alloy

Sun

Wang

et al. 2022

Materials

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Deformation and heat treatment are important means to strengthen aluminum alloys. However, the influence mechanism of pre-strain on aging precipitation kinetics and its effect on mechanical properties are still not clear. In this work, uniaxial isothermal tensile tests with different strains and artificial aging treatments for Al–Zn–Mg–Cu alloys have been carried out. Then, a model describing the precipitates kinetic behavior has been developed to investigate the effect of thermal pre-strain on subsequent aging precipitation kinetics and peak aging microhardness based on the microstructure characterization by TEM, SAXS and XRD tests. In addition, the role of dislocations on the aging precipitation kinetics is also explored. The experimental results show that the peak aging microhardness of the Al–Zn–Mg–Cu alloy reveals a tendency to decrease and increase and then the peak aging time firstly decreases and then keeps almost constant with the increase in the strain. The calculations demonstrate that the precipitate average size almost remains unchanged, while the precipitate volume fraction decreases and then increases with the increase in strain, which is consistent with the change in peak aging microhardness. It also indicates that dislocations can promote precipitate nucleation and growth, while the actual effect depends on the dislocation density, which is closely dependent on the pre-deformation condition, especially for the precipitate nucleation. In particular, when the dislocation density after thermal pre-deformation is not enough, it will slightly inhibit precipitate nucleation but promote precipitate growth, which could shorten the peak aging time, with the peak aging strength being guaranteed.

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Effects of pre-stretching and baking treatment on microstructural evolution and mechanical properties of 7A09 aluminum alloy subjected to pre-hardening forming

Pang

2023

Journal of Alloys and Compounds

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Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation

Cited by 8 publications

References 33 publications

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Effect of Deep Cryogenic Treatment on the Artificial Aging Behavior of 6082 Aluminum Alloy

Experimental and Simulation Study for the Influence of Thermal Pre-Deformation on Subsequent Aging Precipitation Kinetics of Al-Zn-Mg-Cu Alloy

Effects of pre-stretching and baking treatment on microstructural evolution and mechanical properties of 7A09 aluminum alloy subjected to pre-hardening forming

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