Paper Title:
Aging Behavior of Al-Mg-Si Alloys Processed by High-Pressure Torsion
  Abstract

This research investigates simultaneous strengthening by grain refinement and fine precipitation in age-hardenable Al-Mg-Si alloys containing an additional element of either Ag, Cu, Pt or Pd. The alloys were solution-treated and processed by high-pressure torsion (HPT) at room temperature under a pressure of 6 GPa. They were aged at a temperature of 373 K for up to a total period of 6.7 hours. Vickers microhardness was measured after selected periods of aging and the microstructures were observed by transmission electron microscopy. It was found that, in all alloys, the grain sizes after HPT were refined to 300-400 nm and there were significant increases in the hardness through the HPT processing. The hardness was further increased by the subsequent ageing treatment, confirming the simultaneous strengthening by grain refinement and fine precipitation. However, the aging behavior was different depending on the alloying compositions.

  Info
Periodical
Materials Science Forum (Volumes 667-669)
Edited by
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
Pages
259-264
DOI
10.4028/www.scientific.net/MSF.667-669.259
Citation
D. Akama, Z. Horita, K. Matsuda, S. Hirosawa, "Aging Behavior of Al-Mg-Si Alloys Processed by High-Pressure Torsion", Materials Science Forum, Vols. 667-669, pp. 259-264, 2011
Online since
December 2010
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$32.00
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