Influence of heat treatment on the strength and fracture toughness of 7N01 aluminum alloy

Li, Bo; Wang, Xiaomin; Chen, Hui; Hu, Jie; Huang, Cui; Gou, Guoqing

doi:10.1016/j.jallcom.2016.03.228

Cited by 81 publications

(24 citation statements)

References 46 publications

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“…This shows that the fatigue fracture mechanism of 7N01 aluminum alloy with different surface conditions is consistent, and the difference may be the location of the crack source. This ductile transgranular fracture mode has also been reported in other literatures related to fatigue fracture of 7N01 aluminum alloys [6,7,30]. Relevant research shows that the fatigue source of the original surface specimen is the coarse grain layer on the aluminum alloy surface, and the fatigue source of the sandblasted surface specimen is introduced into the inner layer [31].…”

Section: Fracture Morphology Of Fatigue Specimenssupporting

confidence: 78%

“…It not only has the characteristics of 7000 series aluminum alloy, but also has excellent extrusion performance, effective performance and good corrosion resistance. It is often used as structural material for brackets, section beams, end walls and other essential elements on high-speed train to meet the requirements of easy design, manufacturing, strength, light weight, and safety [3][4][5][6]. These applications are mostly high-speed, complex environments, and prevention of fatigue fracture under catastrophic alternating stress so that it becomes a critical challenge for the current application of the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Chen

Cai

Deng

et al. 2020

Mater. Res. Express

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In this paper, the surface of 7N01 aluminum alloy profile is sandblasted or electropolished. The influence of different surface conditions on its conditional fatigue strength and fatigue mechanism under the alternating load after prefabricated short crack are studied. Results show that the 7N01 aluminum alloy with sandblasting treatment has formed a work hardened layer and its fatigue strength is increased by 42.9% comparing with the original surface specimens. The fatigue strength of the 7N01 aluminum alloy after electropolishing is almost unchanged compared with the original specimen. The fatigue behavior of the 7N01 aluminum alloy after prefabricated side straight through the notch deviated from the theoretical smooth specimen law and long crack propagation law in which is a 'shortage effect'. When the notch size is smaller than the transition crack size a 0 , the fatigue limit of the notched specimen is lower than the fatigue limit of the smooth specimen. When the notch size is larger than the transition crack size, the fatigue limit of the long-notched specimen is still lower than that predicted by linear elastic fracture mechanics. Due to the 'short notch effect', the effective notch propagation threshold ΔK eff.th of the long crack is 0.39 Mpa m 1/2 based on the effective notch propagation size a 0 eff of the alloy.

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Section: Fracture Morphology Of Fatigue Specimenssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Chen

Cai

Deng

et al. 2020

Mater. Res. Express

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“…However, the predicted value,ŷ , and standard deviation, s, of the prediction function can be used to establish the normal random distribution Y, (ˆ) Y N s y, . 2 Formally, the improvement of the point x is…”

Section: Materials Design Strategies Based On a Machine Learning Methodsmentioning

confidence: 99%

“…7XXX series Al alloys (Al-Zn-Mg-Cu series alloys) have been widely applied in the body structures and key components of high-speed trains [1][2][3] due to their excellent mechanical properties, low density, and good weldability. However, stress corrosion cracking (SCC) has been an issue in the 7XXX series Al alloys which may lead to significant service failures [4,5].…”

Section: Introductionmentioning

confidence: 99%

Composition design of 7XXX aluminum alloys optimizing stress corrosion cracking resistance using machine learning

Cao

Zhang

Chen

2020

Mater. Res. Express

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In this paper, three different strategies based on machine learning methods were applied to Al-Zn-Mg-Cu series alloy composition design with the targeted property of stress corrosion cracking (SCC) resistance. By comparing the results of the strategies, it was discovered that the performance of the efficient global optimization (EGO) method was better than that of response surface optimization method, and much better than that of Random method, among which the Al-6.05Zn-1.46Mg-1.32Cu-0.13Zr-0.02Ti-0.50Y-0.23Ce (named EGO alloy) alloy had the best stress corrosion cracking resistance. The slow strain rate test (SSRT) technique was carried out to compare the EGO alloy with the traditional 7N01 alloy. It indicated that the I SCC of the new EGO alloy was lower than that of traditional 7N01 alloy for both single and double aging treatment. With the XRD, SEM and EDS analysis, it was found the rare earth elements formed Al 8 Cu 4 (Y, Ce) and quadrilateral phase Al 20 Ti 2 (Y, Ce) in the EGO alloy.

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“…38(b) and (c)). The fracture onset position shows ductile fracture behavior, while the fracture propagation position shows intergranular fracture behavior (Li et al, 2016). Thus the fracture onset position in the experiment was determined as E1 position.…”

Section: Methodsmentioning

confidence: 99%

Formability limits and process window based on fracture analysis of 5A02-O aluminium alloy in splitting spinning

Zhan

Guo

et al. 2018

Journal of Materials Processing Technology

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Splitting spinning or rotary flow splitting is an advanced forming process for manufacturing axisymmetric integrated parts with bifurcated features and unique characteristics of highperformance and low-weight. During the process, under the kinematic effects of mandrel rotational movement and roller radial feed, plastic deformation occurs accompanied usually by undesirable fracture, which reduces the formability limit (FL). In this study, the kinematic effects on the FL of a 5A02-O aluminium alloy in the splitting spinning process were systematically investigated by finite element simulation based on a modified Lemaitre criterion and physical experiments. The results show that at a given roller feed speed or mandrel rotational speed (forming speed), the FL has a nonlinear relationship with forming speed, which increases firstly and then decreases. With the increase of forming speed, the maximum FL decreases, which appears at the larger forming speed. These variations of FL show that there exists a combined effect of the roller feed speed and mandrel rotational speed, thus a ratio between them, named as the roller feed ratio, is then used to investigate FL. It is found that there exists a critical roller feed ratio of approximately 2 mm/rev, independent of the speeds of roller and mandrel. Below this critical value, the FL increases with the roller feed ratio. While over the critical value, the FL decreases. In addition, the decrease of FL becomes more remarkable with the increase of mandrel rotational speed. Furthermore, the variations of stress triaxiality and tensile plastic strain were analyzed to see their effects on FL. The analyses show that the decrease of tensile plastic strain with the increasing roller feed ratio is dominant the increase of FL below the critical roller feed ratio value. The increase in the stress triaxiality is dominant in the decrease of FL when the roller feed ratio is over the critical value in combination with not too high forming speed, whereas both increases are dominant in the decrease of FL when it is over the critical roller feed ratio value in combination with high forming speed. Based on the kinematic effects of mandrel and roller, the process windows of the splitting spinning process were obtained to improve the FL. It is found that under the condition of the roller feed ratio within 1-2.5 mm/rev, the mandrel rotational speed within 8-100 rev/min and the roller feed speed within 0.5-4 mm/s are helpful to get high FL values. The experiments were carried out to verify the prediction on the FL and the process window. The research provides an in-depth understanding of FL and its affecting factors, and thus lays a basis for process optimization and process parameter configuration.

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Influence of heat treatment on the strength and fracture toughness of 7N01 aluminum alloy

Cited by 81 publications

References 46 publications

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Composition design of 7XXX aluminum alloys optimizing stress corrosion cracking resistance using machine learning

Formability limits and process window based on fracture analysis of 5A02-O aluminium alloy in splitting spinning

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