Image icon  Ni-superalloy, fatigue crack propagation

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Description: 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 γ' precipitates in the γ matrix. As a fatigue crack propagates through the superalloy there is a plastic region in front of the crack tip.
Keywords: alloy • fatigue • fracture • metal • nickel • order hardening
Categories: Science approaches > Deformation & failure > Fatigue
Science approaches > Microstructure
Science approaches > Strengthening mechanisms
Materials > Metals & alloys > Nickel & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
Prof T W Clyne, Department of Materials Science and Metallurgy, 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: 25 October 2001
Date added: 21 August 2009
Resource ID: 1147