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

DoITPoMS Micrograph Library Micrograph 81 and full record

Micrograph 81 and full record

Link to image file for micrograph 81
Micrograph no
81
Brief description
Ni-superalloy, fatigue crack propagation
Keywords
alloy Link to MATTER Glossary entry for alloy, fatigue Link to MATTER Glossary entry for fatigue, fracture Link to MATTER Glossary entry for fracture, metal, nickel, order hardening Link to MATTER Glossary entry for order hardening
Categories
Fracture, Metal or alloy
System
Ni-X
Composition
Not specified (Ni-Superalloy)
Standard codes
Reaction
Processing
Applications
Sample preparation
Technique
Scanning electron microscopy (SEM)
Length bar
30 μm
Further information
This sample shows fatigue crack propagation in Udimet 720, a nickel-base superalloy. To improve its high temperature mechanical properties Udimet 720 utilises a strengthening mechanism, known as order hardening. There is a large volume fraction of coherent g' precipitates in the g matrix. As a fatigue crack propagates through the superalloy there is a plastic region in front of the crack tip.
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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