The influence of the ageing temperature on different properties of the EN AW-7075 aluminium alloy

Stamenković, Uroš; Ivanov, Svetlana Lj.; Marković, Ivana; Gorgievski, Milan; Božinović, Kristina; Kovačević, Avram

doi:10.3989/revmetalm.238

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…In this work, Aluminium 7xxx alloy (AA7075) was selected as the matrix material and alumina (Al 2 O 3 ) was used as the reinforcement with an average particle size of 30 µm received from microtroniks lab chemicals. Among the aluminium alloy series, AA7075 has more significance in the automotive and aerospace industries for the development of gears and shafts, bicycle frame, aircraft fittings, missile parts and defense applications due to its strength to weight ratio, high toughness and natural aging characteristics (Moustafa et al, 2022;Uros Stamenkovic et al, 2023). The chemical composition (wt.%) of AA7075 is and Al-to balance.…”

Section: Methodsmentioning

confidence: 99%

Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route

Perumal Ezhilan,

Emmanual,

Alagarsamy

et al. 2023

Rev. metal.

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Aluminium matrix composite (AMC) materials play an important role in the field of automobile and aerospace industries due to their excellent properties. In this research, aluminium alloy (AA7075) was reinforced with alumina (Al2O3) particles to improve their hardness and tribological behaviour of the base alloy. Four composites were prepared by varying the content (4, 8 and 12 wt.%) of Al2O3 particles through the stir casting technique. The surface morphology of the proposed composites ensured the uniform distribution of Al2O3 particles into the matrix alloy. The hardness of the composite was measured using a Brinell hardness tester and the maximum value of hardness was found in the AA7075 - 8 wt.% Al2O3 composite. Hence, a tribological investigation was carried out on this AA7075 - 8 wt.% Al2O3 composite. Load (P), sliding speed (V) and sliding velocity (D) were taken as the wear parameters for conducting the experiments. A Technique for Order Preference by Similarity to Ideal Preferred Solution (TOPSIS) approach has been applied to find out the optimal conditions of parameters to obtain the lowest wear rate (WR) and the co-efficient of friction (COF). The results showed that the lowest WR and COF was obtained at ‘P’ of 15 N, ‘V’ of 1 m•s-1 and ‘D’ of 1000 m•s-1. ANOVA results revealed that ‘P’ is the factor with the most significant contribution (38.36%), followed by ‘D’ (28.32%). The worn surface morphology of the confirmation experiment specimen was investigated by SEM and the wear mechanism was reported.

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Section: Methodsmentioning

confidence: 99%

Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route

Perumal Ezhilan,

Emmanual,

Alagarsamy

et al. 2023

Rev. metal.

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Influence of cold plastic deformation after aging on the mechanical properties and microstructure of aluminum alloy EN AW-7075

Kovačević,

Stamenković,

Nedeljković

2024

Tehnika

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This paper presents research on the changes in the mechanical and structural properties of the commercial aluminum alloy EN-AW 7075 during thermomechanical processing. The processing involved artificial aging of the alloy at a temperature of 150°C for 30 minutes, followed by cold rolling after aging. Changes in hardness and impact toughness during the experiment were monitored. Hardness was measured using the Leeb method, while impact toughness was measured using the Charpy method. In the annealed state, the lowest hardness values were recorded, while the highest-impact toughness value was achieved in the as-quenched state. By applying cold plastic deformation after artificial aging, the hardness of the alloy significantly increased, while the impact toughness continuously decreased. After deformation of 20%, cracks appearance prevented further deformation. Optical microscopy was used to follow microstructural changes during the applied processing regime. Precipitates of various sizes and morphologies were observed in the structure. The annealed state results in poorly defined grain boundaries and formation of large precipitates relatively evenly distributed throughout the matrix. Cold plastic deformation after aging has resulted in elongated grain structure aligned with the rolling direction, along with crushing of secondary phase particles.

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The influence of the ageing temperature on different properties of the EN AW-7075 aluminium alloy

Cited by 2 publications

References 31 publications

Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route

Investigations on microstructure, hardness and tribological behaviour of AA7075-Al2O3 composites synthesized via stir casting route

Influence of cold plastic deformation after aging on the mechanical properties and microstructure of aluminum alloy EN AW-7075

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