Warm forming of 7075 aluminum alloys

Polak, S.; Kaczyński, Paweł; Gronostajski, Z.; Jaśkiewicz, K.; Krawczyk, J.; Skwarski, Mateusz; Zwierzchowski, M.; Chorzępa, Władysław

doi:10.1016/j.proeng.2017.10.1015

Cited by 43 publications

(20 citation statements)

References 3 publications

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“…7xxx-series aluminum alloys (AlZnMgCu) offer a potential to replace a portion of high strength steels [3][4]; however, formability of AA7xxx at ambient temperatures is limited. Warm forming technology is a promising approach to improve the formability of peak-aged 7075 aluminum alloys (AA7075-T6) [5][6][7][8], where the AA7075-T6 blank is heated to target temperatures followed by warm forming with heated or cold dies. The formability of AA7075-T6 under warm conditions can be evaluated by forming limit curves (FLCs) [9][10].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

Lin

Bao

Hou

et al. 2020

Preprint

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Aluminum alloys have drawn considerable attention in the area of automotive lightweight. High strength aluminum alloys are usually deformed at elevated temperatures due to their poor formability at room temperature. In this work, the yield behavior of 7075 aluminum alloy in T6 temper (AA7075-T6) within the temperature ranging from 20 ℃ to 230 ℃ was investigated. Uniaxial and biaxial tensile tests with the aid of induction heating system were performed to determine the stress vs. strain curves and the yield loci of AA7075-T6 at elevated temperatures, respectively. Von Mises, Hill48 and Yld2000-2d yield criteria were applied to predicting yield loci which were compared with experimentally measured yield loci of the AA7075-T6. Results show that yield stress corresponding to the same equivalent plastic strain decreases with increasing temperature within the investigated temperature range and the shape of yield loci evolves nearly negligibly. The experimental yield locus expands with an increase of equivalent plastic strain at the same temperature and the work hardening rate of AA7075-T6 exhibits obvious stress-state-dependency. The non-quadratic Yld2000-2d yield criterion describes the yield surfaces of AA7075-T6 more accurately than the quadratic von Mises and Hill48 yield criteria, and an exponent of 14 in the Yld2000-2d yield function gives the optimal predictions for the AA7075-T6 at all investigated temperatures.

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Section: Introductionmentioning

confidence: 99%

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

Lin

Bao

Hou

et al. 2020

Preprint

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“…It is understood that the dissolution temperature of 510C is the most suitable temperature and the solution time does not have much effect. Formability at different temperatures and times of the 7075-T6 material is investigated and it is shown that its formability increases at high temperatures [11]. It is said that the effect of the lubricant is very high in hot forming and that the 6061 series alloy is better than the alloy of 7075 series [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Different Temperature and Deformation Speeds on Mechanical Properties and Springback behaviour in Al-Zn-Mg-Cu Alloy

Kılıç

2019

mech

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Thanks to their low density and high strength, the 7XXX series aluminum alloys are widely used as a support/beam parts in the aerospace industry. This alloy is target in the lightening studies of the automotive industry and surveys for sheet metal are still in progress. It is a series of alloys that can be applied to the aging process and has the most effect on mechanical properties. As formability is quite weak, methods are investigated. In this study, tensile test, bending test and Erichsen tests are performed at different deformation rates and temperatures. As a result of the experiments, it has been seen that the formability increases at high temperature and low deformation rates. If paint baking time is long, there will be no loss of strength. Also, the bending process is modeled with the help of the finite element analysis programs and the springback estimations are examined. It is seen that the results of the modeling process are quite successful. The effect of the strain rate sensitivity is determined.

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“…However, the high strength properties go hand in hand with limited formability, which is significantly lower than in the 5xxx and 6xxx alloys [3]. The limited cold-forming options [11], temperature sensitivity during hardening [13] as well as susceptibility to cracking at high strain rate [2] are the main obstacles in using the 7075 alloy more widely in the automotive industry.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, extruded rods, sheets and plates [1] are subjected to plastic forming. Typical technological process for the 7075 alloy consists of: ingot homogenization and extruding of the semifinished product, annealing, forming and, later on, heat treatment, which causes the process to be complicated and expensive [11].…”

Section: Introductionmentioning

confidence: 99%

Creating the Structure and Properties of 7075 Alloy Casts by Thermal and Forming Processes

Majerski¹,

Dziubińska²,

Winiarski³

et al. 2019

Adv. Sci. Technol. Res. J.

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In this paper, the hot formability of 7075 aluminum alloy sand and permanent casting ingots were verified. The experiment was carried out by using casting, heat treatment (homogenization) of ingots and conducting isothermal compression tests at temperatures of 420-500°C. The effect of the forming temperature on the microstructure, the tendency for crack formation and hardness were determined. The results show that ingots in the as-cast state have a dendritic network structure rich in the second phase precipitation on the grain boundaries. After the homogenization process, the microstructure is significantly more balanced. The forming process at 420-480°C of sand casts leads to significant grain elongation and crack formation, mainly at the grain boundaries. Raising the forming temperature to 480-500°C leads to a reduction in the occurrence of cracks. On the other hand, permanent mold castings do not reveal cracks during deformation in the temperature range 420-480°C.

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Warm forming of 7075 aluminum alloys

Cited by 43 publications

References 3 publications

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

Experimental and Numerical Investigation of the Effect of Different Temperature and Deformation Speeds on Mechanical Properties and Springback behaviour in Al-Zn-Mg-Cu Alloy

Creating the Structure and Properties of 7075 Alloy Casts by Thermal and Forming Processes

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