Non-isothermal ageing of an Al–8Zn–2Mg–2Cu alloy for enhanced properties

Jiang, Jian-Tang; Tang, Qi; Yang, Lijun; Zhang, K.; Yuan, Shijian; Zhen, Liang

doi:10.1016/j.jmatprotec.2015.07.018

Cited by 60 publications

(15 citation statements)

References 15 publications

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“…For example, T73 and T74 tempers were developed to improve corrosion resistance of 7XXX series Al alloys [3][4][5]. T77 temper was invented to enhance corrosion resistance with maintained high strength for 7XXX series Al alloys [6]. To ameliorate strength, toughness and ductility, secondary aging was also proposed [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

Liu

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The influence of pre-deformation on aging precipitates of three near peak-aged Al-Cu-Li alloys, 1460 alloy with a low Cu/Li ratio (1.46), 2050 alloy with a high Cu/Li ratio (4.51) and 2A96 alloy with a medium Cu/Li ratio (2.97), was investigated. The strength of the aged alloys is enhanced by the pre-deformation. The effectiveness of pre-deformation on precipitates is dependent on the alloy's composition. With increasing the pre-deformation, the population density of T1 (Al 2 CuLi) precipitates increases in all three Al-Cu-Li alloys and their diameter decreases in 2050 and 2A96 alloys, and the greatest effectiveness is observed in 2A96 alloy. The pre-deformation also increases the population density of h 0 (Al 2 Cu) precipitates and decreases their diameter in 2050 and 2A96 Al-Li alloys, but the effectiveness is smaller compared to that on T1 precipitates. In 1460 alloy subjected to two-step aging at 130°C for 20 h followed by 160°C for 12 h, the main precipitates are d 0 (Al 3 Li). At 2%-6% pre-deformation, GP-I zones form and pre-deformation displays little influence. Eight percentage pre-deformation promotes h 00 /h 0 precipitation and increases their population density.

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Section: Introductionmentioning

confidence: 99%

Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

Liu

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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“…Another study found that NIA treatment bestowed Al-Zn-Cu-Mg alloy with optimal performance, and a hardness and tensile strength of 182 HV and 578 MPa, respectively [27]. High electrical conductivity and high strength of the alloy were obtained by setting a heating range of 180°C-190°C and a cooling rate between 10°C·h −1 and 20°C·h −1 [28]. Thus, the NIA treatment can improve the mechanical properties and corrosion resistance of materials and significantly shorten the ageing period.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

Wang

Jiang

et al. 2020

Mater. Res. Express

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Al-Cu, being a high-strength aluminium alloy, is used to prepared castings which are widely used in the automotive and aerospace industries as lightweight parts. However, corrosion is an issue. The Al-Cu alloys show improved properties when other elements are added to them. One such alloy is Al-4.5Cu-3.5Zn-0.5Mg. In order to improve the corrosion resistance and strength of this Al-4.5Cu-3.5Zn-0.5Mg cast alloy, a novel non-isothermal ageing (NIA) treatment was developed that comprised a heating stage up to 250°C, followed by a cooling stage down to room temperature at the rate of 60°C·h −1 . Specimens were removed throughout the process and immediately quenched for morphological, mechanical, and electrochemical testing. The hardness continuously increased up to 124 HV with ageing time. The alloy exhibited optimal properties after ageing for~340 min (with the aging temperature reaching 130°C during the cooling stage of the NIA treatment), with a tensile strength and maximum corrosion depth of 395 MPa and 165 μm, respectively. Fine precipitates discontinuously appeared at the grain boundaries during the cooling stage. Some new fine Ω phases were precipitated in the grains, thereby narrowing the precipitation-free zone. Thus, high strength and good corrosion resistance of the alloy can be obtained via the NIA treatment. Notably, NIA treatments are less time-consuming than isothermal ageing treatments, thereby expanding the applications of high-strength cast aluminium alloys in the manufacturing industry.

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“…This process can effectively save costs by shortening the production time. Jiang et al [16,17] investigated the precipitation behaviors and enhanced properties of an Al-Zn-Mg-Cu alloy during the NIA process, and found that appropriate NIA treatment allowed alloys to achieve higher performance than typical aging treatments in a shorter period of time. It was reported by Peng et al [18] that, under NIA treatment, GPI zones were predominantly formed by homogeneous nucleation in the highly supersaturated solid solution at the early stage during aging, improving the initial increment of both hardness and tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Precipitate Behavior, Mechanical Properties and Corrosion Behavior of an Al-Zn-Mg-Cu Alloy during Non-Isothermal Creep Aging with Axial Tension Stress

Zhu

Jiang

et al. 2020

Metals

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Theprecipitate behavior, mechanical properties and corrosion behavior of an Al-Zn-Mg-Cu alloy during non-isothermal creep aging were investigated. The results show that diffraction patterns of GPI zones gradually disappear and those of η′ phases are strengthened during the heating stage. More importantly, the size and volume fraction of precipitates increase with aging temperature increasing, which greatly enhances the mechanical properties of the alloy. The hardness and tensile strength of the alloy with H210 aging condition are 165 HV and 564 MPa, respectively. During the cooling stage, in addition to the diffraction pattern of η′ phase, that of GPI zones can be observed again. Furthermore, the size of the precipitates decreases, and the volume fraction reaches a maximum. The hardness and tensile strength of the alloy with C120 aging condition reach 185 HV and 580 MPa, respectively. Furthermore, the characteristics of the grain boundary reveal that the width of precipitation free zones (PFZ) first increases during the heating stage and then decreases during the cooling stage. In the C120 condition, the newly generated secondary precipitates and the coarsening of undissolved precipitates around the grain boundary lead to the further narrowing of PFZ, but the coarse grain boundary precipitates (GBPs) are still not continuously distributed in the grain boundary. Hence, the alloy with C120 condition exhibits the most excellent corrosion resistance.

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Non-isothermal ageing of an Al–8Zn–2Mg–2Cu alloy for enhanced properties

Cited by 60 publications

References 15 publications

Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

Influence of Pre-deformation on Aging Precipitation Behavior of Three Al–Cu–Li Alloys

Microstructure, corrosion behavior and mechanical properties of a non-isothermal ageing treated cast Al–4.5Cu–3.5Zn–0.5Mg alloy

Precipitate Behavior, Mechanical Properties and Corrosion Behavior of an Al-Zn-Mg-Cu Alloy during Non-Isothermal Creep Aging with Axial Tension Stress

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