Hot Tensile Behavior of Superplastic and Commercial AA5083 Sheets at High Temperature and Strain Rate

Abstract:

Since the last two decades, the automotive industry has dedicated an increasing attention to the manufacturing of sheet components made of high-resistant aluminium alloys; the superplastic AA5083 grade is currently utilized in both the conventional superplastic forming and the recently patented quick plastic forming, which assures higher productivity compared to that of superplastic forming, while the commercial AA5083 grade is rarely employed. The objective of the paper is to compare the hot tensile behaviour of commercial and fine-grained AA5083 sheets when processed at high temperature and strain rate, which are typical of hot stamping processes. The results are presented and commented in terms of flow stress, anisotropy, strain at failure, microstructural and hardness features as a function of temperature and strain rate. On the basis of the obtained results, the set of optimal forming conditions for the two grades is identified.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 63-70
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.63
• Online since: June 2013
• Authors: Stefania Bruschi, Andrea Ghiotti, Francesco Michieletto
• Keywords: Aluminium Alloy, Hot Forming, Tensile Test

References

[1] R. Neugebauer, T. Altan, M. Geiger, M. Kleiner, A. Sterzing: Sheet metal forming at elevated temperatures, CIRP Annals. 55/2 (2006) 799-816.

DOI: 10.1016/j.cirp.2006.10.008

[2] Bariani P.F., Bruschi S., Ghiotti A., Turetta A., Testing formability in the hot stamping of HSS, CIRP Annals – Manuf. Tech., 57/1 (2008) 265–268.

DOI: 10.1016/j.cirp.2008.03.049

[3] Ghiotti A, Bruschi S, Borsetto F, Tribological characteristics of high strength steel sheets under hot stamping conditions, Journal of Materials Processing Technology, 211/11 (2011) 1694-1700.

DOI: 10.1016/j.jmatprotec.2011.05.009

[4] Toros S., Ozturk F. and Ilyas Kacar, Review of warm forming of aluminum–magnesium alloys, Journal of Materials Processing Technology, 207/1-3 (2008) 1–12.

DOI: 10.1016/j.jmatprotec.2008.03.057

[5] K. Sotoudeh, and P.S. Bate, Diffusion creep and superplasticity in aluminium alloys, Acta Materialia, 58 (2010) 1909-1920.

DOI: 10.1016/j.actamat.2009.11.034

[6] Jung-Kuei Chang, Ken Takata, Koji Ichitani and Eric M. Taleff, Ductility of an aluminum-4.4 wt. pct. magnesium alloy at warm- and hot-working temperatures, Materials Science and Engineering A, 527 (2010) 3822-3828.

DOI: 10.1016/j.msea.2010.02.042

[7] J. Liu, M.J. Tan, Y. Aue-u-lan, A. Jarfors, K.S. Fong and S. Castagne, Superplastic-Like Forming of non-Superplastic AA5083 Combined with Mechanical Pre-Forming, International Journal of Advanced Manufacturing Technology, 52/1-4 (2011) 123-129.

DOI: 10.1007/s00170-010-2729-9

[8] W.P. Green, M.-.A. Kulas, A. Niazi, K. Ohishi, E.M. Taleff, P.E. Krajewski, and T.R. McNelley, Deformation and failure of a superplastic AA5083 aluminum material with a cu addition, Metallurgical and Materials Transactions A, 37/9 (2006) 2727-2738.

DOI: 10.1007/bf02586106