Image icon  Magnesium alloy, fracture surface

 
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Description: This micrograph shows the brittle nature associated with the grain boundary phase, rich in zinc and rare earths. During tensile testing below 200°C the grains deform plastically but the boundaries remain elastic. This manifests itself with the growth of voids at the grain boundary phase/grain interface which link up and cause failure by the brittle intergranular fracture mode III method. Here the grain boundary phase can be clearly seen to be spalling off of the grain.
Keywords: magnesium
Categories: Science approaches > Deformation & failure > Fracture
Science approaches > Microstructure
Materials > Metals & alloys > Magnesium & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: R J Mitchell, Department of Engineering, University of Leicester
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 05 March 2003
Date added: 21 August 2009
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Resource ID: 1762