Interactive Resource icon  Coherency Strain Hardening

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Description: The contribution of coherency strain hardening to the overall yield stress will depend on the number and spacing of the zones or precipitates, and also on the degree of strain produced by each. In general, longer ageing times result in larger, more widely separated precipitates, each having a larger strain field. Coherency strain hardening reaches a maximum when the average zone spacing is similar to the limiting radius of dislocation curvature. This interactive animation shows coherency strain hardening for fine, medium and coarse zone spacing.
Keywords: zone spacing • precipitate • hardening • ageing time
Categories: Science approaches > Strengthening mechanisms
Science approaches > Strengthening mechanisms > Precipitation (age) hardening
Materials > Metals & alloys > Aluminium & alloys
Created by: MATTER, The University of Liverpool
Andrew Green, The University of Liverpool
Contributions: Jürgen Hirsch, Hydro Aluminium Deutschland GmbH
Graeme Marshall, Alcan International Ltd
Paul Evans, Innoval Technology Ltd (formerly Alcan Intl. Ltd, Banbury)
Ricky Ricks, Innoval Technology Ltd (formerly Alcan Intl. Ltd, Banbury)
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: 18 July 2001
Date added: 21 December 2009
Resource ID: 2618