Characterization of the AA 2024-T3 and AA7075-T6 for aircraft applications
List of Authors
  • Shamsia , Syed Roslee

Keyword
  • AA20204-T3, AA7075-T6, Precipitations, Mechanical Properties, microstructure analysis

Abstract
  • Aluminium alloys especially 2024-T3 and 7075-T6 are widely used for aerospace industry due to its high strength, low weight and high damage tolerance performance. This study is extremely valuable for determining the characteristic or properties changes of the aircraft materials due to time and service environment. The solution heat treatment and the effect of alloying elements on the material properties has been evaluated. The phase properties of both samples were analysed using X-Ray Diffraction (XRD) technique and Field Emission Scanning Electron Microscope coupled with Energy Dispersive X-Ray (FESEM-EDX). It was observed that the XRD peak intensities of the sample AA7075-T6 are slightly greater than the sample of AA2024-T3 while in the FESEM-EDX chemical composition analysis on the precipitates shows the presence of high copper and zinc element that had contributed significant effect on the material properties. From the mechanical test result the yield strength and the hardness value of AA7075-T6 are 69MPa and 40Hv higher than the AA2024-T3 respectively. Fine precipitates arrangement that parallel with the elongated grains revealed in the microstructure analysis showed that the fabrication process and the effect of solution heat treatment between artificial aging (T3) and natural aging (T6) has contributed to the behaviour of their mechanical properties.

Reference
  • 1. ASTM International ASTM E8-13, (2013). Standard Test Methods for Tension Testing of Metallic Materials

    2. Atef Korchef, Saifeddine Charfeddine, Karim Zehani, Lotfi Besais (2014). Grain refinement and Lattice Imperfections in Commercial Aluminum Alloy Processed by Severe Plastic Deformation, Materials Science and Engineering 62

    3. Cavaliere P., Nobile R., et al, (2016). “Mechanical and microstructural behaviour of 2024- 7075 aluminium alloy sheets joined by friction stir welding.”, IJMM, 588-594.

    4. Cubberly W.H. (ed.) (1979). Properties and selection, nonferrous alloy and pure metals. ASM Metal Handbook, 9th edition Volume 2, Materials Park, Ohio, 193, 832.

    5. Deepak C. Patil, K. Venkateswarlu, S.A. Kori, Goutam Das, Mousumi Das, Saleh N. Alhajeri (2014). Mechanical property evaluation of an Al-2024 alloy subjected to HPT processing, Materials Science and Engineering 63.

    6. Deng Y., Zhang Y., Wan L., Zhang X. (2012). Effect of thermomechanical processing on production of Al-Zn-Mg-Cu alloy plate. Mat. Sci. Eng. A., 554:33–40.

    7. Emre Öksüz K., Hanlar Bağirov, Mehmet Şimşir, Ceyhun Karpuzoğlu, Aykut Özbölük, Yusuf Z. Demirhan, Hayrettin U. Bilgin. (2013). Investigation of Mechanical Properties and Microstructure of AA2024 and AA707, Applied Mechanics and Materials, 390:547-551

    8. González-Sánchez J., Corvo F. and Acuña-González N. (2009). Environmental Degradation of Infrastructure and Cultural Heritage in Coastal Tropical Climate.

    9. Gürgen, Selim & Kushan, Melih & Diltemiz, S. (2015). Fatigue failure in aircraft structural components.

    10. Intan Fadhlina Mohamed et al., (2014). Nanostructure control of age-hardenable Al 2024 alloy by high-pressure torsion IOP Materials Science and Engineering 63.

    11. Joseph R.D. (ed) (1997). Heat treating. ASM Handbook Volume 4, Materials Park, Ohio. 841-879.

    12. Júlio C.O. Lopes (2008). Material Selection, Ciência & Tecnologia dos Materiais. 20: 78-82.

    13. Khatami N.et al., (2011) "The Boron Effect on Mechanical Properties of Aged 2024 Aluminum Alloy", Advanced Materials Research, Vol. 339 152-156.

    14. Kowalski A., Ozgowicz W., Grajcar A., Lech-Grega M., Kurek A. (2017). Microstructure and Fatigue Properties of AlZn6Mg0.8Zr Alloy Subjected to Low-Temperature Thermomechanical Processing. Metals, 7:488.

    15. Meyveci, Ahmet & Karacan, İsmail & Caligulu, Ugur & Durmuş, Hülya (2010). Pin-on-disc characterization of 2xxx and 6xxx aluminium alloys aged by precipitation age hardening. Journal of Alloys and Compounds, 278-283.

    16. Molnár, Tamás & Szuchy, Peter & Csikós, Sándor & Gogolák, László & Bíró, István & Sárosi, József. (2019). Material Tests and Analysis of Aircraft Materials, 17. 95-100.

    17. Oluyemi John Olawalec et al. (2013). Effect of Heat Treatment on Some Mechanical Properties of 7075 Aluminium Alloy, Materials Research, 16(1): 190-194.

    18. Radha. R, Jafferson J. M. and Darshan G. (2018). ARPN Journal of Engineering and Applied Sciences 2018 Asian Research Publishing Network, Vol. 13, No. 4.

    19. Ren K. L., Gao S. W., Liu P. P., and Dong Y. (2011). Influence of environmental factors on corrosion damage of aircraft structure Theoretical & Applied Mechanics Letters.

    20. Shahsavari A. (2015). Significant Increase in Tensile Strength and Hardness in 2024 Aluminium Alloy by Cryogenic Rolling Procedia Materials Science, 11: 84 – 88.

    21. Sivashanmugam M., Manoharan N., Ravi Kumar S., (2009).” Investigation of Microstructure and Mechanical Properties of GTAW and GMAW Joints of AA7075 Aluminium Alloy”, Int. Journal on Design and Manufacturing Technologies. 3: No.2.

    22. Starke E. A. Jr, and J. T. Staley (1996). “Applications of modern aluminium alloys to aircraft”, Prog. Aerospace Sci. 32: 131-172.

    23. Tolga Dursun & Costas Soutis (2014). Materials & Design 56: 862-871.

    24. Zhu L., Li N., Child P.R.N. (2018) Light-weighting in aerospace component and system design. Propulsion and Power Research 7(2):103-119.