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Influence of low Cu addition on quench sensitivity in Al-Mg-Si alloys

Abstract

Quench sensitivity in two Al-Mg-Si alloys, one Cu-free and the other with low Cu additions (~0.1 wt%), both having the same amounts of other solutes, has been investigated using transmission electron microscopy (TEM) and corresponding material hardness. A two stage hardness evolution during an isothermal heat treatment was observed with slow cooling after solution heat treatment. This effect was less pronounced in the Cu-added alloy. However maximum hardness was not influenced by cooling rate, which could be related to higher precipitate number densities and volume fractions. Both alloys were over-aged faster in the slow cooling conditions

Category

Academic article

Client

  • Research Council of Norway (RCN) / 193619
  • NORTEM / 197405

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • Norsk Hydro ASA

Year

2014

Published in

Advanced Materials Research

ISSN

1022-6680

Volume

922

Page(s)

616 - 621

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