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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.45  No.7 (2004)  >  pp.2282-2287

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Aging Behaviour and Mechanical Properties of a Solution Treated and ECAP Processed 6082 Alloy

Giuliano Angella1), Paola Bassani1), Ausonio Tuissi1) and Maurizio Vedani2)
1) National Research Council-Institute for Energetics and Interphases CNR-IENI
2) Politecnico di Milano-Dipartimento di Meccanica

A study was carried out on the aging behaviour of a solution treated 6082 aluminium alloy deformed by equal channel angular pressing up to six passes. Aging of the so obtained ultrafine alloy was studied by DSC and TEM analyses as well as by isothermal treatments at 130, 160 and 180°C. The results showed that the formation of metastable β″ and β′ precipitates were markedly anticipated and that the stable β phase was partially suppressed in the alloy processed to 4 and 6 passes, presumably due to anticipated precipitation of Si-rich particles. TEM analyses revealed that a transition in strengthening-precipitate structure occurred in the severely deformed alloy leading to a predominance of globular precipitates over the rod like phases typically found in the undeformed and aged samples. Tensile tests carried out on severely deformed and aged samples allowed to quantify the maximum strength achievable by the 6082 alloy after concurrent grain refinement and peak-hardness aging at 130°C.

6082 alloy, ultrafine structure, aging kinetics, mechanical properties

Received: January 19, 2004
Accepted: March 30, 2004 , Published online: June 24, 2005
Copyright (c) 2005 The Japan Institute of Metals



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