Effects of Pre-Aging on Bendability of an Asymmetric-Rolled Al-Mg-Si Alloy

Abstract:

The effects of pre-aging before natural aging on the bendability of an asymmetric-rolled Al-Mg-Si alloy were investigated. In the specimen without pre-aging, hardness increased with natural aging time due to the formation of nanoscale cluster (nanocluster; Cluster (1)). The suppression of Cluster (1) during natural aging is clearly seen in the pre-aged specimens though the formation of Cluster (2). It was found that tensile properties were not so affected by the types of clusters. Bending test clearly showed that the pre-aging improves the bendability of this alloy. This effectiveness of pre-aging means Cluster (2) well contributes the deformability of this alloy compared with Cluster (1). Such an improvement of bendability is considered to be derived from the structure of nanoclusters and its interactions with the factor of plastically deformation of alloys.

• Periodical: Materials Science Forum (Volumes 706-709)
• Pages: 377-382
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.706-709.377
• Online since: January 2012
• Authors: Tomo Ogura, Akio Hirose, Tatsuo Sato
• Keywords: Al-Mg-Si Alloy, Asymmetric-Rolling, Bendability, Nanocluster

References

[1] Y. Miki, K. Koyama, O. Noguchi, Y. Ueno, T. Komatsubara, Increase of lankford value of Al-Mg-Si sheets for automotive panel produced by asymmetric warm rolling, Mater. Sci. Forum 539-543 (2007) 333-338.

DOI: 10.4028/www.scientific.net/msf.539-543.333

[2] K. Yamada, T. Sato, A. Kamio, Cluster formation and two-step aging behaviors of Al-Mg-Si alloys, J. Jpn. Inst. of Light Metals 51 (2001) 215-221.

DOI: 10.2464/jilm.51.215

[3] A. Serizawa, S. Hirosawa, T. Sato, Three-Dimensional atom probe characterization of nanoclusters responsible for multistep aging behavior of an Al-Mg-Si alloy, Metall. Mater. Trans. 39A (2008) 243-251.

DOI: 10.1007/s11661-007-9438-5

[4] G. Ito, T. Suzuki, K. Horikawa, Effect of alloy composition and quenching rate on the bendability in Al-Mg-Si Alloys, Mater. Sci. Forum 396-402 (2002) 1193-1198.

DOI: 10.4028/www.scientific.net/msf.396-402.1193

[5] J. Sarkar, T. R. G. Kutty, D. S. Wilkinson, J. D. Embury, D. J. Lloyd, Tensile properties and bendability of T4 treated AA6111 aluminum alloys, Mater. Sci. and Eng. A 369 (2004) 258-266.

DOI: 10.1016/j.msea.2003.11.022

[6] M. Asano, T. Minoda, Y. Ozeki, H. Yoshida, Effect of copper content on the bendability of Al-Mg-Si alloy sheet, Mater. Sci. Forum 519–521 (2006) 771–776.

DOI: 10.4028/www.scientific.net/msf.519-521.771

[7] Y. Takagi, O. Takezoe, Effect of Chemical Composition and Solution Heat Treatment on Bendability of Al-Mg-Si Alloys for Automobile Body Panels, Kobe Steel Engineering Report 47 2 (1997) 6-8.

[8] A. Serizawa, T. Sato and W. J. Poole, The characterization of dislocation-nanocluster interactions in Al-Mg-Si(-Cu/Ag) alloys, Philos. Mag. lett. 90 (2010) 279-287.

DOI: 10.1080/09500831003633231