Interactive Resource icon  Secondary Phase Particles

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Description: For commercial applications, alloying elements are added to aluminium in order to achieve the required mechanical properties. Such elements are added above the solid solubility limits to form second phase particles, also known as intermetallics. Second phase particles form during solidification, through segregation at cellular/dendrite boundaries. They are also formed by precipitation from supersaturated solid solutions (i.e. strengthening precipitates). Second phases have a great impact on the corrosion properties of aluminium, generating different forms of corrosion attack such as pitting, intergranular corrosion, stress corrosion cracking, etc. This animation shows that they may be anodic, inert or cathodic to aluminium.
Keywords: alloying elements • intermetallics • secondary phase • solidification • segregation • cellular boundaries • precipitation • solid solution • corrosion attack • strengthening
Categories: Science approaches > Strengthening mechanisms > Solid-solution strengthening
Science approaches > Strengthening mechanisms > Precipitation (age) hardening
Science approaches > Corrosion & degradation
Materials > Metals & alloys > Aluminium & alloys
Created by: MATTER, The University of Liverpool
Steven Meijers, Corus
Carlos Caicedo-Martinez, Corus
Contributions: Andreas Blistein, Alcan
Herman Terryn, Vrije Universiteit Brussel (VUB)
Iris De Graeve, Vrije Universiteit Brussel (VUB)
Marc Ryckeboer, Sapa
Published by: European Aluminium Association, Brussels
License: This resource is released under the Creative Commons Attribution Non-Commercial No Derivatives license (2.0 UK: England & Wales).
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Date created: 19 January 2005
Date added: 07 July 2010
Resource ID: 2863