Ni-superalloy, fatigue crack propagation
DoITPoMS, University of Cambridge
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.
Not specified (Ni-Superalloy)
Scanning electron microscopy (SEM)
Prof T W Clyne
Department of Materials Science and Metallurgy, University of Cambridge