Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 567, Issue -, Pages 21-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.01.004
Keywords
Electron microscopy; Mechanical properties; Aluminium alloys; Dispersoids; Dispersion hardening
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Funding
- KMB project MoReAl
- Research Council of Norway
- Hydro and Sapa Technology
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The precipitation behaviour of dispersoids in Direct Chill (DC)- cast 3xxx alloys with varying compositions of manganese and silicon has been studied during isothermal annealing at low temperatures. The evolution of density, size and volume fraction of the dispersoids has been quantitatively studied by Transmission Electron Microscopy (TEM) and electrical conductivity measurements. Moreover the influence of precipitation of dispersoids on hardness and tensile strength of the alloys is systematically investigated. A clear dispersion hardening effect from dispersoids is revealed and the hardening effect increases with increasing Mn and Si contents in the alloys. The hardening effect from dispersoids is discussed in light of the Orowan mechanism. (C) 2013 Elsevier B.V. All rights reserved.
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