Image icon  Section of a metal matrix composite (MMC)

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Description: The extrusion and cold swaging processes lead to the elongation of grains. This micrograph shows a longitudinal section with the working direction lying horizontal. Since the material has only been annealed for 1h at 350 degrees C, recrystallisation has only just started. Nucleation occurs at the reinforcement particles but there is no clear preference for nucleation at highly angular particles or particles with high aspect ratios. It was also noted that recrystallisation occurs preferentially at the surface of cold swaged specimens, probably due to strain localisation.
Keywords: annealing • cold swaging • composite material • extrusion • MMC • particle • SiC • silicon carbide
Categories: Science approaches > Microstructure
Science approaches > Strengthening mechanisms > Recovery, recrystallisation & grain growth
Materials > Hybrids > Composites > Metal matrix
Processes > Shaping > Deformation > Extrusion
Processes > Thermal treatments > Annealing
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Prof T W Clyne, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 03 October 2002
Date added: 21 August 2009
Resource ID: 1643