Paper Title:

Aging Behavior of Al-Mg-Si Alloys Processed by High-Pressure Torsion

Periodical Materials Science Forum (Volumes 667 - 669)
Main Theme Nanomaterials by Severe Plastic Deformation: NanoSPD5
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 Daichi Akama et al., 2010, Materials Science Forum, 667-669, 259
Online since December, 2010
Authors Daichi Akama, Zen Ji Horita, Kenji Matsuda, Shoichi Hirosawa
Keywords Al-Mg-Si Alloys, Grain Refinement, High-Pressuer Torsion, Precipitation, TEM
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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.