Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy

Koç, Funda Gül; Çöl, Mustafa; Celiker, T.

doi:10.3139/120.111242

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…MgZn2 is the main precipitate that increases the hardness of AA7075 series aluminum alloy. Coarse Al2CuMg, AlMnFeSi, and Al7Cu2Fe precipitates are formed during solidification and cannot be dissolved by solution treatment [33][34][35]. Hardness tests were applied using a Future-Tech Vickers hardness tester under a 3 kg load for 10 seconds.…”

Section: Materials and Methods 21 Heat-treatment And Microstructural ...mentioning

confidence: 99%

“…High strength and hardness are obtained by reaching the optimum distribution of the fine-sized and high amounts of precipitates. Fine and uniform MgZn2 (ƞ) precipitates coherent with matrix lead to an increase in the hardness and strength of 7075 alloys [35]. Hence, the T6 and F heattreated specimens show the highest material hardness.…”

Section: Materials and Methods 21 Heat-treatment And Microstructural ...mentioning

confidence: 99%

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Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Yarar

Ertürk

Koç

et al. 2022

J. of Materi Eng and Perform

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The main objective of this study is to examine the machinability and the surface quality conditions of the AA7075 material with different temper conditions. For this purpose, various temper treatments are implemented to evaluate the impact of microstructural properties on tool wear and the surface quality of the drilled holes. The drilling operations have been done on 0, F, T4, T6, and T7 temper conditions. Process parameters were three different spindle speeds (715, 1520, and 3030 rev/min) and three feed rates (0.1, 0.2, and 0.3 mm/rev) with HSS-G highperformance ground standard twist drill bit. The present work deals with the effects of temper conditions on thrust force, drilling temperature, tool wear, surface integrity, and chip morphology. Response surface methodology was used in the evaluation of experiment results. The optimization results showed that while thrust force and torque are not significantly affected by a change in spindle speed, they are sensitive to an increase in feed rate. Heat-generation on the drill bit is the lowest at low levels of both the feed rate and spindle speed parameters. The AA7075-T6 condition specimen was machined with continuous chip formation, resulting in the best hole surface quality. The 3D finite element modeling of the drilling process was carried out, and the drilling performance of AA7075-T6 was evaluated in terms of thrust force, heat generation, and chip formation.

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Section: Materials and Methods 21 Heat-treatment And Microstructural ...mentioning

confidence: 99%

Section: Materials and Methods 21 Heat-treatment And Microstructural ...mentioning

confidence: 99%

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Yarar

Ertürk

Koç

et al. 2022

J. of Materi Eng and Perform

Self Cite

View full text Add to dashboard Cite

show abstract

“…MgZn2 is the main precipitate that increases the hardness in AA7075 series aluminum alloy. Coarse Al2CuMg, AlMnFeSi and Al7Cu2Fe precipitates are formed during solidification and cannot be dissolved by solution treatment [17][18][19].…”

Section: Heat-treatment and Microstructural Characterizationmentioning

confidence: 99%

“…High strength and hardness are obtained by reaching the optimum distribution of the fine-sized and high amount of precipitates. Fine and uniform MgZn2 (ƞ) precipitates coherent with matrix lead to an increase in the hardness and strength of 7075 alloys [19]. Hence, the T6 and F heat-treated specimens show the highest material hardness.…”

Section: Fig 1 Microstructures Of the Heat-treated Specimensmentioning

confidence: 99%

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Yarar

et al. 2021

Preprint

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AA7075 is one of the most suitable materials for aerospace, aircraft, and defense applications with its high yield strength and low-density. In many other modern machining methods, conventional drilling remains the most extensive material removal process in industrial components. The main objective of this study is examining the machinability and surface quality conditions of the AA7075 material with different temper conditions. For this purpose, various temper treatments are implemented to evaluate the impact of microstructural properties on tool wear and surface quality of the drilled holes. The drilling operations have been done on O, F, T4, T6, and T7 temper conditions. Process parameters were three different spindle speeds (715, 1520, and 3030 rev/min) and three feed rates (0.1, 0.2, and 0.3 mm/rev) with HSS-G high-performance ground standard twist drill bit. The present work deals with the effects of temper conditions on thrust force, drilling temperature, tool wear, surface integrity, and chip morphology. Drilling performance is related to the intrinsic microstructural properties of temper conditions. Response surface methodology was used in the evaluation of experiment results. The optimization results showed that while thrust force and torque are not significantly affected by change in spindle speed, they are sensitive to increase in feed rate. Heat-generation on the drill bit is the lowest at low levels of both the feed rate and spindle speed parameters. Among different temper conditions, the AA7075-T6 condition sample is processed with continuous chip formation and resulted in the best hole surface quality. The 3D finite element modelling of the drilling process was carried out, and the drilling performance of AA7075-T6 was evaluated in terms of thrust force, heat generation, and chip formation.

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Residual stress and crystallite size analysis of SMAT on AA7075-T6

Yarar,

Erturk,

Karabay

2024

Surface Engineering

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The study examines how SMAT influences the microstructure, dislocation density, and residual stress of AA7075-T6 alloy. SMAT involves the repeated impact of shots on a material surface within a vibration chamber, inducing severe plastic deformation and grain refinement. The study explores the interplay between vibration-induced shot effects and their impact on surface properties, emphasizing the importance of optimizing process parameters for improved material performance. Experimental analyses, including surface and subsurface microstructure examinations, X-ray diffraction (XRD) characterization, and residual stress evaluations, are conducted to elucidate the underlying mechanisms of SMAT. Results indicate that SMAT leads to significant plastic deformation, grain size reduction, increased dislocation density, and microstrain. The treatment produces a nanocrystallite layer, enhancing material properties. Residual stress measurements reveal a surface stress of −245 MPa, increasing to −360 MPa at 50 µm depth. The proposed multiple impact model accurately predicts deformation behavior, highlighting the deep pit regions formed during SMAT. This comprehensive investigation provides insights into the dynamic nature of SMAT and its potential for enhancing material properties. By integrating experimental findings with numerical modeling approaches, the study advances our understanding of SMAT-induced plastic deformation mechanisms and residual stress profiles.

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Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy

Cited by 4 publications

References 30 publications

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Comparative Analysis in Drilling Performance of AA7075 in Different Temper Conditions

Residual stress and crystallite size analysis of SMAT on AA7075-T6

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