Effect of Microstructure on Thermal Expansion Coefficient of 7A09 Aluminum Alloy

Ji, Hongzhi; Lin, Yuan; Shan, Debin

doi:10.1016/s1005-0302(11)60145-x

Cited by 16 publications

(7 citation statements)

References 14 publications

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“…The most common method used to improve strength in Al-ZnMg-Cu alloys is aging treatment. Strength values of 7xxx series alloys can be increased significantly with various heat treatment processes [4][5][6][7][8][9]. While 7xxx series alloys gain high strength under the artificial aging (T6) conditions, they become considerably sensitive towards stress corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…GP zones which have low interfacial energies and in turn, can be produced at low temperatures, are coherent with the matrix and spheric. In the progressive stages of aging, firstly they grow and semi-coherent, instable and monoclinic ή (MgZn 2 ) phase is formed while incoherent, stable and hexagonal η (MgZn 2 ) phase is formed in the last stage [9]. Besides, with the heat treatment, orthorombic S (Al 2 CuMg) phase and T (Al 32 (Mg,Zn) 49 cubic phase nucleate in the structure at the stage of cooling following the solution process [16].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Different Heat Treatment Conditions on Fatigue Behavior of AA7075 Alloy

Fakioglu

Özyürek

Yilmaz

2013

High Temperature Materials and Processes

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In this study, the effect of different heat treatment processes applied to AA7075 alloys on the fatigue behavior was examined. The processes applied to AA7075 aluminum included annealing (O), high temperature pre-precipitating (HTPP), artificial aging (T6), retrogression and re-aging (RRA). The annealing heat treatment was performed for 2 hours at 500°C and samples were cooled in the furnace. In the artificial aging (T6) process, after the samples were solution treated for 2 hours at 500°C, they were quenched at room temperature and aged for 24 hours at 120°C. In the retrogression and re-aging process, samples were solution treated for 1 hour at 220°C after the T6 process and then re-aged for 24 hours at 120°C. In the high temperature pre-precipitating, pre-precipitates were formed for 30 minutes at 450°C and then, it was aged for 24 hours at 120°C. All samples were characterized through the scanning electron microscope (SEM + EDS), hardness measurements and X-ray difraction (XRD) techniques. At the end of experimental studies, SEM and EDS examinations XRD results revealed that η (MgZn 2 ) phase formed in the microstructure following the HTTP, RRA and T6 heat treatment processes. As a result of the fatigue tests, the highest fatigue strength was measured in samples treated with artificial aging (T6), the lowest fatigue strength was measured in the annealed (O) samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Different Heat Treatment Conditions on Fatigue Behavior of AA7075 Alloy

Fakioglu

Özyürek

Yilmaz

2013

High Temperature Materials and Processes

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“…7(c). To consider preheating expansion of aluminum alloy forging billet, the linear expansion coefficient of aluminum alloy is 23.8×10 6 /℃ by reference [9]. After calculation, it is reasonable to determine the residual volume of forging billet at about 3-4% and the simulation results show a good result.…”

Section: Thermec 2018mentioning

confidence: 99%

Forging Process Design and Simulation Optimization of a Complex-Shaped Aluminium Alloy Component

Chen

Wang

Song

et al. 2018

MSF

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In order to meet the requirements of lightweight and replace steel with the aluminum for a component on the high speed rail, the forging process of a complex-shaped aluminum alloy component was researched and the parameters were optimized with the DEFORM-3D finite element simulation technology. The qualified products were finally obtained instead of the original steel castings by reducing weight of 65%. It is noted that the parts with complicated shape and non-symmetry, metal flow uneven during forging process that lead to incomplete forming, higher forging pressure problems. In this paper, such problems were analyzed couple with numerical simulation method based on a certain forming pressure. Moreover, the model and slot was reasonably designed. In addition, the size of blank was constantly optimized to change the metal flows direction and cavity filling mode. Finally, the forgings with good surface quality and mechanical properties were obtained by production test, and can be used as reference for this kind of forging components.

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“…The thermal expansion coefficient of super-invars is comparable to that of glass and therefore the stress originated from the differences in the expansion coefficients at the contact interface is minimized [5]. Theoretical explanations and experimental investigations have suggested that the thermal expansion characteristics may be affected by the microstructural conditions including residual strain, grain size and the precipitation of intermetallic phases [6].…”

Section: Intorductionmentioning

confidence: 99%

“…We have developed some methods for combined simulation of technological processes and operating regimes of cast components [6]. In this work, 3D CAD geometric model for simulation consists of two final components inserted into the hollow cylindrical casting and the mould, as it is shown in Fig.…”

Section: Software and Technologymentioning

confidence: 99%

Simulation of Centrifugal Casting and Structure of Fe-Ni-Co Super-Invar Alloy

Ogorodnikova

Chermensky

Konchakovsky

2017

SSP

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This paper is focused on multi-scale modeling of solidification and alloy microstructure evolution through computer-aided simulation of the technological processes. Microstructure characterization of cast alloy after centrifugal casting including grain size, dendrite cell size and porosity is of interest in this paper. The centrifugal technological process was simulated using special LVMFlow program for computer-aided analysis of casting technologies to predict shrinkage porosity in axi-symmetric part blanks. The cast blanks were made of Fe-Ni-Co alloy with low thermal expansion and after turning could be used as bearing parts in contact with glass or ceramics. A method of combined simulation of technological processes and operating regimes of cast components was developed. The proposed method of simulating the complicated model allows separating the component from casting geometry in CAE postprocessor and the plot distribution of calculated parameters over the component. Also, this method allows varying diameters of hollow cylindrical casting and choosing the best location of components relative to the predicted porosity in the blank for high quality turning. The distribution of temperature and porosity could be used for more precise calculation of internal stresses in cast component under loading conditions with respect to the structural factors. The structural parameter was stated on a base of the calculated temperature fields to associate grain structure of cast alloy with solidification conditions. The austenitic microstructure of Fe-Ni-Co super-invar alloy was studied on the samples, which were cut from the axi-symmetric part after turning the blank. The calculated structural parameter was assigned with the types of grain structure.

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Effect of Microstructure on Thermal Expansion Coefficient of 7A09 Aluminum Alloy

Cited by 16 publications

References 14 publications

Effects of Different Heat Treatment Conditions on Fatigue Behavior of AA7075 Alloy

Effects of Different Heat Treatment Conditions on Fatigue Behavior of AA7075 Alloy

Forging Process Design and Simulation Optimization of a Complex-Shaped Aluminium Alloy Component

Simulation of Centrifugal Casting and Structure of Fe-Ni-Co Super-Invar Alloy

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