EFFECT OF SECONDARY AGING of EN AC 43200 ALUMINUM ALLOY to MECHANICAL PROPERTIES

Year 2020, Volume: 3 Issue: 1, 16 - 20, 30.06.2020

Bedri Baksan , İbrahim Çelikyürek , Yusuf Kılıç

Abstract

In this study EN-AC 43200 Aluminum alloy was subjected to secondary or interrupted aging following a T6 heat treatment. The 43200 alloy is a used widely in automotive industry for lowering weights of vehicles by substituting with ferrous alloys. This study covers the substitution of an automotive company’s part. 4320 Al alloy was melted under Argon atmosphere with an induction furnace, and cast into graphite molds. The samples were homogenized at 500 oC for 96 hours. Solutionizing treatment also done at 500 oC for 14 hours, following water quenching, T6 treatment was done at 250 oC for 2 hours ended with a water quench. Secondary aging trials were done at 100, 150 and 200 oC for 2, 4, 6 and 8 hours for each temperature range respectively. Tensile tests and microhardness tests were applied to for cast, T6 condition, and secondary aged samples. The samples were polished and observed for microstructure under optical microscope. Maximum strength value of 370 MPa, and hardness 113 Hv was obtained from samples aged secondarily at 150 oC for 6 hours.

Keywords

Aluminum alloys, Aging, Optical microscopy, Tensile Strength, Hardness

Supporting Institution

TÜBİTAK-TEYDEB

Project Number

116054

Thanks

This study is supported by TUBITAK-TEYDEB Project Number 116054 and the authors would like to express their deepest appreciation to organizing committee of TICMET19 in the selection of our study which was presented in the conference organized on 10-12 October, 2019 in Gaziantep University.

References

• 1. Başer, T., Alüminyum alaşımları ve otomotiv endüstrisinde kullanımı. Mühendis ve Makina, 2013. 53(635): p. 51-58.
• 2. Hofer, J., E. Wilhelm, and W. Schenler, Optimal Lightweighting in Battery Electric Vehicles. World Electric Vehicle Journal, 2012. 5(3): p. 751-762.
• 3. Century, C.M., et al., Materials Research Agenda for the Automobile and Aircraft Industries. 1993: National Academies Press.
• 4. Roth, R., J. Clark, and A. Kelkar, Automobile bodies: Can aluminum be an economical alternative to steel? Jom, 2001. 53(8): p. 28-32.
• 5. Abd El-Rehim, A.F. and M.A. Mahmoud, Transient and steady state creep of age-hardenable Al-5 wt% Mg alloy during superimposed torsional oscillations. Journal of Materials Science, 2013. 48(6): p. 2659-2669.
• 6. Century, C.M., et al., Materials Research Agenda for the Automobile and Aircraft Industries. 1993: National Academies Press.
• 7. Vehicles, N.R.C.C.o.M.f.L.M. and N.R.C.N.M.A. Board, Materials for Lightweight Military Combat Vehicles: Report. 1982: National Academy Press.
• 8. Trucks, C.o.L.M.f.s.C.A., N.M.A. Board, and D.o.E.a.P. Sciences, Use of LIGHTWEIGHT MATERIALS in 21st century ARMY TRUCKS, ed. N.R.C.o.t.N. Academies. 2003, U.S.A: National Academies Press.
• 9. GÜL, F., AlSi10Mg Döküm Alaşımlarının Bazı Mekanik Özellikleri Üzerine İkincil Yaşlandırma İşleminin Etkisi. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2014. 18(1).
• 10. Fahri VATANSEVER, A.T.E., Sedat KARABAY, Alüminyum-Silisyum Alaşımlarının Mikroyapısal ve Mekanik Özelliklerinin T6 Isıl İşlemi ile İyileştirilmesi. Dokuz Eylül Üniversitesi-Mühendislik Fakültesi Fen ve Mühendislik Dergisi, 2018. 20(60).
• 11. Lumley, R., I. Polmear, and A.J. Morton, Interrupted aging and secondary precipitation in aluminium alloys. J Materials Science Technology, 2003. 19(11): p. 1483-1490.
• 12. Hai, L., Z. Ziqiao, and W. Zhixiu, Investigation of Secondary Ageing Characteristics of 7055 Aluminum Alloy—(Ⅱ) Microstructures and Fractography [J]. J Rare Metal Materials Engineering, 2005. 8.
• 13. Koch, G. and D. Kolijn, The heat treatment of the commercial aluminum alloy 7075. J Journal of Heat Treating, 1979. 1(2): p. 3-14.
• 14. Buha, J., R. Lumley, and A. Crosky, Microstructural development and mechanical properties of interrupted aged Al-Mg-Si-Cu alloy. J Metallurgical Materials Transactions A, 2006. 37(10): p. 3119-3130.
• 15. Lumley, R., I. Polmear, and A.J. Morton, Development of mechanical properties during secondary aging in aluminium alloys. J Materials Science Technology, 2005. 21(9): p. 1025-1032.
• 16. Cao, X. and J. Campbell, Morphology of β-Al5FeSi phase in Al-Si cast alloys. Materials Transactions, 2006. 47(5): p. 1303-1312.