Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 75
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Full Record for Micrograph 75

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Micrograph no
75
Brief description
Notched zinc, broken by impact at room temperature
Keywords
alloy Link to MATTER Glossary entry for alloy, cleavage Link to MATTER Glossary entry for cleavage, fracture Link to MATTER Glossary entry for fracture, metal, zinc
Categories
Fracture, Metal or alloy
System
Zn
Composition
Notched zinc
Standard codes
Reaction
Processing
Applications
Sample preparation
Technique
Scanning electron microscopy (SEM)
Length bar
1 mm
Further information
This is a notched zinc specimen broken by impact at room temperature. It has failed by a cleavage mechanism. One can observe the cleavage planes clearly separated by regions of local shear, where the fracture path crosses to adjacent planes. The cleavage planes are atomically flat and are not associated with much plastic deformation. At low temperature metals having b.c.c. and h.c.p structures have insufficient independent slip systems operating and are brittle, fracturing by cleavage.
Contributor
Prof T W Clyne
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
25/10/01
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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