Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment

Tekeli, Süleyman; Şimşek, İjlal; Şimşek, Doğan; Özyürek, Dursun

doi:10.1515/htmp-2019-0050

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…The peaks appear only on specimens AA170 and AA195 because the quantitative proportion of the MgZn2 phase is higher due to higher aging temperature. The second peaks are most visible in the specimen aged at 195° C. Due to their small proportion and the overlapping of some peaks, the presence of the phases Al2CuMg (Sphase), Al6Mg11Zn11 (T-phase), Al7Cu2Fe, which are determined as insoluble impurityoriginated particles [30][31][32], and Al6Fe should be further verified by electron microscopy and microanalysis.…”

Section: Resultsmentioning

confidence: 92%

The Influence of Shot Peening and Artificially Ageing Aluminium Alloy 7075 on Corrosion Behaviour

et al. 2022

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This paper investigates the corrosion of shot peened AA7075 aluminium alloys aged at different temperatures. The surface integrity of the hardened layer was evaluated with SEM, EDS, differential scanning calorimetry, hardness, and roughness measurements, and in the end also with corrosion resistance tests. The research results indicated that there were significant differences in precipitates distribution between aluminium alloys artificially aged at different temperatures. As the ageing temperature increases, the microhardness decreases, which influences the final roughness condition of the surface layer after shot peening. The results of potentiodynamic polarisation tests indicate that shot peening enables shifting the pitting potential to positive values, which ensures slightly higher corrosion resistance. SEM images confirmed the dissolution of the aluminium matrix near the separated iron-rich phases of the Alx form (Fe, Mn) by the action of galvanic cells.

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Section: Resultsmentioning

confidence: 92%

The Influence of Shot Peening and Artificially Ageing Aluminium Alloy 7075 on Corrosion Behaviour

et al. 2022

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“…Figure 6 illustrates the XRD results for the experimental test (A3B3C1) of the confirmation test, revealing prominent peaks corresponding to Al, ZrO 2 , MgSi, MgZn 2 , and Al 2 Cu [34]. The formation of secondary phases on the surface was found to enhance the composite's wear resistance and microhardness, with temperature playing a key role in promoting the formation of these secondary phases [35].…”

Section: Optimization Of Heating Process Parametersmentioning

confidence: 99%

Optimization on hardening process parameters of alumnium alloy 7075 based composites using gra approach

et al. 2023

Mater. Res. Express

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Aluminium Metal Matrix Composites (AMMCs) are the essential need for applications such as aerospace, aircraft, marine, transport and automobiles due to their best mechanical, corrosion and tribological behaviour. In this research, Alumnium alloy 7075 is chosen for matrix material because of its much more need of mechanical, corrosion and tribological properties enhancement. The nano zirconium di oxide (ZrO2) is chosen for reinforcement to fulfil the properties requirement of AA7075 for various applications. The AA7075/wt. % Zr02 (x= 0, 5, 10, 15 and 20) composites are prepared by stir casting route. The fabricated composites are subjected to tensile strength and density test to determine the best combination of AA8009 based composites. The best combination of AA7075 based composites is subjected to EDAX and SEM test to determine the presence of elements of reinforcement and matrix material. The stir casted AA7075 based composites are further subjected to hardening under different conditions to enhance their required properties. The input parameters of hardening are age hardening temperature, hardening duration and cooling environment. The chosen response parameters are micro hardness and wear loss. The micro hardness and wear resistance of composites are determined by employing tensile Vickers hardness tester and pin on disc equipment. The optimization is done by using Grey Relational Analysis (GRA). The optimized age hardening process parameters are hardening temperature (400°C), hardening duration (270 minutes) and cooling environment (Furnace cooling). The obtained higher micro hardness and lower wear loss of confirmation test combination specimen is 138 HV and 27 mg respectively.

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“…It is suggested that the heat treatment process follows the sequence saturated solid solution → GP zones → ή (MgZn2) → η (MgZn2). The orthorombic S (Al2CuMg) phase and the T (Al32(Mg,Zn)49) phase may also form [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

Tahmasbi,

Samuel,

Zedan

et al. 2023

Materials

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The present study was performed on three versions of 7075 alloy to which Sc or Sc + Li was added. The alloys were subjected to various aging treatments. The microhardness results show that the highest value of hardness was achieved when the alloy containing Li + Sc was aged at 120 °C for 24 h whereas the minimum level was exhibited by the base alloy aged at 280 °C. The results were interpreted in terms of the size and distribution of the main hardening phase (η′(MgZn2)), and the role of the presence of Al and Cu in the used alloy. Precipitation of Al3(Sc, Zr, Ti) phase particles during solidification of the Sc-containing ingots was also discussed. The coarsening and spheroidi-zation of η-phase particles take place through the Ostwald ripening mechanism while smaller par-ticles in solution dissolve and deposit on larger particles. In Sc-containing alloys, star phase particle consists of different layers. The change in the brightness from layer to layer indicates that the Zr and Sc concentrations are varied within the star phase, since the atomic number of Zr (40) is higher than the atomic number of Sc (21). The addition of Sc, as well, leads to marked decrease in the grain size of the as-cast alloys i.e., 300 µm and 45 µm, respectively. The interaction between Li and Sc would reduce the effectiveness of the grain refining effect of Sc. The results of the refining effect of Sc were confirmed using the EBSD technique.

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Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment

Cited by 13 publications

References 16 publications

The Influence of Shot Peening and Artificially Ageing Aluminium Alloy 7075 on Corrosion Behaviour

The Influence of Shot Peening and Artificially Ageing Aluminium Alloy 7075 on Corrosion Behaviour

Optimization on hardening process parameters of alumnium alloy 7075 based composites using gra approach

Effect of Aging Treatment on the Strength and Microstructure of 7075-Based Alloys Containing 2% Li and/or 0.12% Sc

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