Effect of peak-aged heat treatment on corrosion behavior of the AA6063 alloy containing Al₃Ti

• Autorzy: Cevik E. , Sun Y. , Ahlatci H.

Warianty tytułu

PL

Wpływ obróbki cieplnej na korozje stopów AA6063 zawierajacych Al.₃Ti

• Języki publikacji: EN

Abstrakty

EN

The purpose of this study is to analyse the microstructure and corrosion properties of homogenised and aged AA 6063 aluminium alloys, containing up to 2% Ti, after the conventional casting technique. The microstructure of the homogenised and aged alloys was examined using an optic microscope, and scanning electron microscope. The micro-hardness test was used for the hardness measurements of the investigated alloys. Corrosion tests were performed by suspending samples of certain sizes into 30 gr/l NaCl + 10 ml/l HCl solutions, measuring the mass loss; potentiodynamic polarisation measurements were carried out in the same solution. The microstructure characterization of the investigated alloys shows the Al (matrix), non-shaped dark globular grey-coloured phase and rod-shaped phases formed at the grain boundaries. The non-shaped dark grey-coloured phase is Mg₂Si. The rod-shaped phase, formed in the microstructure of the Ti-added AA 6063 alloys, is Al₃Ti. The Ti content of the alloy increases, the Al₃Ti phase tends to elongate and become plated. The results of the corrosion tests proved that the corrosion rate decreased in alloys containing less than 1% Ti, and the rate of corrosion increased in alloys containing more than 1% Ti, regardless of whether the alloys were homogenised and aged. Another observation was that aging heat treatment improved corrosion resistance.

PL

Celem niniejszej pracy jest analiza mikrostruktury i właściwości korozyjnych poddanych obróbce cieplnej stopów aluminium AA 6063, zawierających do 2% Ti, po odlewaniu konwencjonalnym. Mikrostrukturę homogenizowanych stopów zbadano za pomocą mikroskopii optycznej i skaningowej mikroskopii elektronowej. Test mikrotwardości zastosowano do pomiaru twardości badanych stopów. Badania korozyjne przeprowadzono poprzez zawieszenie próbki o określonych rozmiarach w roztworze 30 gr/l NaCl + 10 ml/l HCl i pomiar ubytku masy; pomiary potencjo-dynamicznej polaryzacji zostały przeprowadzone w tym samym roztworze. Charakterystyka mikrostruktury badanych stopów pokazuje matryce Al; ciemnoszare, nieregularne wydzielenia fazy Mg₂Si; oraz na granicach ziaren pręcikowe wydzielenia fazy Al₃Ti, obecne w mikrostrukturze stopów AA 6063 z dodatkiem Ti. Ze wzrostem zawartości Ti, wydzielenia fazy Al₂Ti stają się wydłużone i płytkowe. Wyniki testów korozyjnych wykazały, że szybkość korozji spadła w stopach zawierających mniej niż 1% Ti, a wzrosła w stopach zawierających więcej niż 1% Ti, niezależnie od tego, czy stopy były homogenizowane i starzone. Zaobserwowano, że obróbka cieplna podwyższa odporność stopów na korozję.

Słowa kluczowe

EN

non ferrous metals and alloys; casting; corrosion; microstructure

PL

obróbka cieplna; właściwości korozyjne; stopy aluminium

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2012
• Tom: Vol. 57, iss. 2
• Strony: 469--477
• Opis fizyczny: Bibliogr. 29 poz., rys., tab., wykr.

Twórcy

autor

Cevik E.

autor

Sun Y.

autor

Ahlatci H.

• Karabuk University, Engineering Faculty, Metallurgical and Materials Engineering, 78050 Karabuk, Turkey

Bibliografia

• [1] A. Meyveci, I. Karacan, U. Calıgulu, H. Durmus, Pin-on-disc characterization of 2xxx and 6xxx aluminium alloys aged by precipitation age hardening. Journal of Alloys and Compounds 491, 278-283 (2010).
• [2] W. Weiwei, H. Jianmin, L. Weijing, W. Jinhua, Study of rare earth element effect on microstructures and mechanical properties of an Al-Cu-Mg-Si cast alloy. Rare Metals 25, 129-132 (2006).
• [3] A. S. Anasyida, A. R. Daud, M. J. Ghazali, Dry sliding wear behaviour of Al-12Si-4Mg alloy with cerium addition. Materials and Design 31, 365 (2010).
• [4] A. K. Bhattamishra, K. Lal, Microstructural studies on the effect of Si and Cr on the intergranular corrosion in Al-Mg-Si alloys, Materials Design 18, 25-28 (1997).
• [5] T. Ramgopal, P. I. Gouma, G. S. Frankel, Role of grain boundary precipitates and SDZ on the intergranular corrosion of aluminum alloy AA7150. Corrosion Science Section 58, 687-697 (2002).
• [6] P. Leblanc, G. S. Frankel, A study of corrosion and pitting initiation of AA2024-T3 using atomic force microscopy. Journal of Electrochemical Society 149, 239-247 (2002).
• [7] W. Zhang, G. S. Frankel, Localized corrosion growth kinetics in AA2024 alloys. Journal of Electrochemical Society 149, 510-519 (2002).
• [8] Y. Baek, G. S. Frankel, Electrochemical quartz crystal microbalance study of corrosion of phases in AA2024. Journal of Electrochemical Society 150, 1-9 (2002).
• [9] W. Zhang, G. S. Frankel, Transitions between pitting and intergranular corrosion in AA2024. Electrochımıca Acta 48, 1193-1210 (2003).
• [10] Q. Meng, G. S. Frankel, Effect of Cu content on corrosion behavior of 7xxx series aluminum alloys. Journal of Electrochemical Society 151, 271-283 (2004).
• [11] N. Birbilis, R. G. Buchheit, Corrosion damage accumulation on high strength aluminum alloys: Some advances in understanding the role of intermetallics. Corrosion and Materials 29, 4-10 (2004).
• [12] N. Birbilis, R. G. Buchheit, Electrochemical characteristic of intermetallic phases in Al alloys. Journal of Electrochemical Society 152, 140-151 (2004).
• [13] H. Santos, F. Reis, C. Kunioshi, J. Rossi, I. Costa, Corrosion performance of Al-Si-Cu hypereutectic alloys in a synthetic condensed automotive solution. Materials Research 8, 155-159 (2005).
• [14] G. Svenningsen, M. G. Larsen, J. C. Walmsley, J. H. Nordlien, K. Nisancıoglu, Effect of artifical aging on intergranular corrosion of extruded AlMgSi alloy with small Cu content. Corrosion Science 48, 1528-1543 (2006).
• [15] T. Huang, G. S. Frankel, Influence of grain structure on anisotropic localised corrosion kinetics of AA7xxx-T6 alloys. Corrosion Engineering Science and Technology 41, 192-199 (2006).
• [16] L. A. Dobrzanski, K. Labisz, A. Olsen, Microstructure and mechanical properties of the Al-Ti alloy with calcium addition. Journal of Achievements in Materials and Manufacturing Engineering 26, 183-188 (2008).
• [17] M. Gavgali, Y. Totik, R. Sadeler, The effect of artificial aging on wear properties of AA 6063 alloy. Materials Letters 57, 3713-3721 (2003).
• [18] H. Ahlatci, A. Durmaz, A. Balta, M. Acarer, E. Candan, Effect of Ti on the corrosion behaviour of in-situ Mg2Si particle reinforced Al-12Si-20Mg-XTi alloys. Materials Science Forum 636, 511-516 (2010).
• [19] N. Saheb, T. Laoui, A.R. Dauda, M. Harun, S. Radimana, R. Yahaya, Influence of Ti addition addition on wear properties of Al–Si eutectic alloys. Wear 249, 656-662 (2001).
• [20] K. Das, L. K. Narnaware, A study of microstructure and tribological behaviour of Al-4.5% Cu /Al3Ti Composites. Materials Characterization 60, 808-816 (2009).
• [21] R. A. Siddiqui, H. A. Abdullah, Influence of aging parameters on the mechanical properties of 6063 aluminium alloy. Journal of Materials Processing Technology 102, 234-240 (2000).
• [22] M. Gavgali, Y. Totik, R. Sadeler, I. Kaymaz, Improvements of fatigue behavior in 2014 Al alloy by solution heat treating and age-hardening. Wear 236, 144-152 (2004).
• [23] H. Kacar, E. Atik, C. Meric, The effect of precipitation-hardening conditions on wear behaviors at 2024 aluminium wrought alloy. Wear 236, 144-152 (2003).
• [24] D. G. Altenpohl, Aluminum technology, applications and environment a profile of a modern metal. 6th ed. TMS (1998).
• [25] K. D. Ralston, S. Chrisanti, T. L. Young, R. G. Buchheita, Corrosion inhibition of aluminum alloy 2024-T3 by aqueous vanadium species. Journal of The Electrochemical Society 155, 350-359 (2008).
• [26] M. Cavanaugh, N. Birbilis, R. G. Buchheit, F. Bovard, Investigating localized corrosion susceptibility arising from Sc containing intermetallic Al3Sc in high strength Al-alloys. Scripta Materialia 56, 995-998 (2007).
• [27] N. Birbilis, R. G. Buchheit, An experimental survey of electrochemical characteristics for intermetallic phases in aluminum alloys. Journal of the Electrochemical Society 152, 140-146 (2005).
• [28] M. Anik, P. Avci, A. Tanriverdi, ˙I. Celikyurek, B. Baksan, R. Gurler, Effect of the eutectic phase mixture on the anodic behavior of alloy AZ91. Mater. Design 27, 347-355 (2006).
• [29] G. Kiourtsidis, S. M. Stolianos, Corrosion behaviour of squeze-cast silicon carbide -2024 composites in aerated 3.5% sodium chloride. Mater. Sci. Eng. A 248, 165-172 (1998).