Effects of pre-treatments on aging precipitates and corrosion resistance of a creep-aged Al–Zn–Mg–Cu alloy

Lin, Yan Cherng; Zhang, Jinlong; Guan, Lan; Liang, Yuqing

doi:10.1016/j.matdes.2015.06.029

Cited by 105 publications

(13 citation statements)

References 53 publications

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“…Although the strength reaches the maximum value, the distribution of S precipitates is still very inhomogeneous. Since the precipitation-free zones are softer than the precipitated matrix, the plastic flow should occur preferentially within these regions [37,38,39,40]. Thus, both the strength and ductility of TiB 2 /2024 composites are adversely influenced by precipitation-free zones because of their vulnerability to premature fracture.…”

Section: Resultsmentioning

confidence: 99%

Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment

et al. 2019

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In this work, the combination of cold rolling with post-aging treatment is developed to achieve the optimal strength–ductility for the in situ nano TiB2/Al–Cu–Mg composite. The microstructure and mechanical properties of the composite subjected to 20% thickness reduction of cold rolling at room temperature and their evolutions upon post-aging at different temperatures were investigated by means of a tensile test, differential scanning calorimetry, scanning electron microscopy, and transmission electron microscopy. It was found that the TiB2 particles were effective in dislocation pinning and accumulation during the cold-rolling process. The tensile tests indicated that both the yield and ultimate tensile strengths of the cold-rolling sample increased a lot due to the dislocation strengthening and precipitation strengthening generated by dynamic precipitation during cold rolling in comparison with the conventional T6 sample. After aging at 100 °C/12 h, the elongation to failure reached ~8.4%, which was higher than the conventional T6 sample. Meanwhile, there was also a dramatic increase of strength. The yield and ultimate tensile strengths are ~644 MPa and ~726 MPa, respectively. This remarkable strength–ductility combination was due to the modified microstructure caused prior to artificial aging by the cold-rolling method and the formation of nanosized Guinier–Preston–Bagaryatsky (GPB) zones. The underlying mechanisms related to the superior strength–ductility combination were discussed regarding the microstructural characteristics in the composite.

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Section: Resultsmentioning

confidence: 99%

Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment

et al. 2019

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“…2, secondary phase precipitates formed in the structure of the AA7075 alloy aged at 120°C for 25 hours. The precipitation series of the Al-Zn-Mg-Cu alloys occur as supersaturated solid melt, GP (Guinier-Preston) zones, metastable η′-phase, and stable ηphase (MgZn 2 ) [7,11]. In the 7xxx series alloys, the strength improvement usually depends on the type, intensity and size of precipitates formed in the structure as a result of the aging treatment [12].…”

Section: Resultsmentioning

confidence: 99%

“…For the 7xxx series alloys, the highest strength is obtained using the T6 heat treatment [6]. Second phase precipitation systems in the 7xxx series alloys were analysed in many studies and emphasized that precipitation, supersaturated solid solution, GP zones, metastable η′-phase, and stable η-phase occurred in the structure [7,8]. The first step of the T6 heat treatment for the 7xxx series alloys is the solution treatment.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Aging Time on Microstructure and Mechanical Properties of the AA7075 Alloy after T6 Heat Treatment

Şimşek¹,

Şimşek²,

Özyürek³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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In this study, the effect of the aging time on microstructure and mechanical properties of the AA7075 alloy after T6 heat treatment is investigated. The AA7075 alloys are quenched after solid solution treatment at 485°C for 2 hours and artificially aged at 120°C using five different aging times. Hardness measurements, microstructure examinations (SEM + EDS, XRD), and tensile tests are performed for the aged alloys. Fractured surfaces are also examined using SEM images after the tensile testing. The results of the studies conducted show that the hardness value of the alloys can be increased by increasing aging time, and the maximum hardness value of 192 HV is obtained for the alloy aged for 25 hours. Tensile tests also show that the tensile strength of the alloy can be increased by increasing aging time, and the maximum tensile strength value of 580 MPa is obtained for the alloy aged for 25 hours. Fractured surface examinations revealed that the ductile fracture mechanism is mostly dominant, while the planar fracture mechanism is observed as well.

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“…Conventional aging treatments have been used for decades to modify mechanical properties of aluminum alloys. Recently, aging under stress, termed creep aging or stress-aging, has drawn significant attention [11][12][13][14][15][16]. Stress-aging can be defined as precipitation hardening in the presence of external stress.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aging under Stress on Mechanical Properties and Microstructure of EN AW 7075 Alloy

Sajadifar

Krooß

Fröck

et al. 2021

Metals

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In the present study, microstructural and mechanical properties of EN AW 7075 following stress-aging were assessed. For this purpose, properties of stress-aged samples were compared with values obtained for conventionally aged counterparts. It is revealed that the strength and hardness of EN AW 7075 can be increased by the presence of external stresses during aging. Precipitation kinetics were found to be accelerated. The effects of conventional and stress-aging on the microstructure were analyzed using synergetic techniques: the differently aged samples were probed by differential scanning calorimetry (DSC) in order to characterize the precipitation processes. DSC was found to be an excellent screening tool for the analysis of precipitation processes during aging of this alloy with and without the presence of external stresses. Furthermore, using electron microscopy it was revealed that an improvement in mechanical properties can be correlated to changes in the morphologies and sizes of precipitates formed.

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Effects of pre-treatments on aging precipitates and corrosion resistance of a creep-aged Al–Zn–Mg–Cu alloy

Cited by 105 publications

References 53 publications

Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment

Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment

The Effect of the Aging Time on Microstructure and Mechanical Properties of the AA7075 Alloy after T6 Heat Treatment

Effects of Aging under Stress on Mechanical Properties and Microstructure of EN AW 7075 Alloy

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