Image icon  Ni-Superalloy, exposed microstructure

 
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Description: Following exposure at temperature typical of that found in the modern gas turbine engine, there exist two white phases, one with intergranular distribution and the other smaller particles, apparently randomly distributed. The larger semi-continuous intergranular phase is likely to be either the M23C6 carbide or the deleterious TCP phase, σ. Previous work has concluded that this phase is indeed σ, which is detrimental to mechanical strength, in particular creep life by embrittlement of the grain boundaries.

Region 1: γ matrix
Region 2: γ' particle
Region 3: Topologically close packed phase, σ



View schematic diagram of γ' microstructure
Keywords: nickel
Categories: Science approaches > Deformation & failure > Creep
Science approaches > Microstructure
Materials > Metals & alloys > Nickel & alloys
Properties > Mechanical & thermal > Creep resistance
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: R J Mitchell, Rolls-Royce University Technology Centre, 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: 05 March 2003
Date added: 21 August 2009
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Resource ID: 1758