Semi-quantitative evaluation of texture components and fatigue properties in 2524 T3 aluminum alloy sheets

Shen, Fanghua; Yi, Danqing; Jiang, Yong; Wang, Bin; Liu, Huiqun; Tang, Chaojun; Shou, Wenbin

doi:10.1016/j.msea.2016.01.026

Cited by 47 publications

(18 citation statements)

References 20 publications

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“…Moreover, the IPA values gradually increase with the Cu contents increase (Figure 6b) and the IPA reaches a minimum value of 9.6% when the Cu content is 0.98 wt.%. Here, the IPA is defined according to reference [18]:…”

Section: Fracture Toughnessmentioning

confidence: 99%

Effect of Cu on the Fracture and Exfoliation Corrosion Behavior of Al-Zn-Mg-xCu Alloy

Jiao

Chen

et al. 2018

Metals

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In the present work, the influence of Cu content on microstructure, mechanical properties and exfoliation corrosion behaviors of Al-Zn-Mg-xCu alloy extrusions has been investigated in longitudinal-transverse (L-T) and short-longitudinal (S-L) directions by means of mechanical tensile and exfoliation corrosion testing combined with optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that a higher Cu content significantly decreased the fracture toughness and ductility of the alloy in S-L direction compared with L-T direction. Concomitant with the increase in Cu content, a transition in fracture mode was observed from transgranular dimpled rupture to intergranular rupture in S-L direction. Moreover, the exfoliation corrosion (EXCO) resistance of the alloy decreased as the Cu content increased and the exfoliation corrosion resistance of the alloy in short-transverse (S-T) direction was better than that of L-T direction. These results were mainly associated with the large number of coarse intermetallics caused by high Cu content in the L-T direction of alloy.Boeing 787 and Airbus A380 aircraft [5][6][7]. With the development of aerospace industry, the demand for large-sized cross-section components (especially thick plates) is becoming more and more urgent and the requirements such as hardenability and mechanical property uniformity of the alloy are also becoming stricter [8][9][10]. Wu et al.'s research showed that the anisotropy of fatigue crack propagation was ascribed to the coarse inclusion particles and T 1 precipitates [11]. Jata et al. suggested that the yield stress anisotropy may be due to the combined synergistic effect of particles and crystallographic texture [12]. Hu et al. showed that the occurrence of the anisotropy in over-aged 7050 aluminum alloy was mainly attributed to the microstructures, which were further characterized by visible precipitate free zones (PFZs) and coarse precipitates in (sub)grain boundaries [13]. However, there are few studies on the influence of alloy composition on the anisotropy of mechanical properties for Al-Zn-Mg-Cu aluminum alloy thick plate or forging, such as the Cu element. As the main alloying element of Al-Zn-Mg-Cu alloy, Cu has its solid solution strengthening effect and its addition could change the precipitation phase structure of the alloy and make the aging precipitates more dispersed and uniform, which could improve the strength and plasticity of the alloy. However, as the content of Cu increases, the alloy will have a problem of high corrosion sensitivity. Marlaud et al. observed that the precipitates were easy coarsening in the lower Cu-containing alloy due to slower diffusivity of Cu in Al compared to Mg and Zn atoms [14]. Knight et al. believed that the reduction of quenching rate contributed to the increase of Cu content in grain boundary, thereby improving the stress corrosion resistance [15]. It has also been reported that the increase of Cu content in the alloy would lead to an incre...

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Section: Fracture Toughnessmentioning

confidence: 99%

Effect of Cu on the Fracture and Exfoliation Corrosion Behavior of Al-Zn-Mg-xCu Alloy

Jiao

Chen

et al. 2018

Metals

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“…In contrast, the spacing of the fatigue striations in the 2524 T3 sheet sample treated in the air furnace was smaller than that of the sample treated in the salt bath. The length of such striations is related to the grain size, owing to the effects of deflection and retardation by grain boundaries [24,31]. These often mean the former exhibited better fatigue resistance.…”

Section: Fatigue Fracture Analysismentioning

confidence: 99%

Effects of heating rate during solid-solution treatment on microstructure and fatigue properties of AA2524 T3 Al–Cu–Mg sheet

Shen

Wang

et al. 2016

Materials & Design

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“…For example, in order to minimise the structural weight and thus maximise the payload capacity of the KC-135 aircraft, 7178-T6 aluminium alloy is used in the lower wing skins, and 7075-T6 alloy is used in other parts of the aircraft [1][2][3][4]. Among the various aluminium alloys, Al-Cu alloys have received extensive research attention because of their remarkable tensile properties [5][6][7][8]. The properties of Al-Cu alloys can be improved by adding other elements to it.…”

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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Semi-quantitative evaluation of texture components and fatigue properties in 2524 T3 aluminum alloy sheets

Cited by 47 publications

References 20 publications

Effect of Cu on the Fracture and Exfoliation Corrosion Behavior of Al-Zn-Mg-xCu Alloy

Effect of Cu on the Fracture and Exfoliation Corrosion Behavior of Al-Zn-Mg-xCu Alloy

Effects of heating rate during solid-solution treatment on microstructure and fatigue properties of AA2524 T3 Al–Cu–Mg sheet

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

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