|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Coupling Experiments and Modeling to Understand Plasticity and Failure
||Microstructure Sensitive Crack Nucleation in PM Ni Alloys
||Bo Chen, Jun Jiang, Fionn Dunne
|On-Site Speaker (Planned)
Fatigue crack nucleation in a powder metallurgy produced nickel alloy containing a non-metallic inclusion has been investigated through integrated small-scale bend testing, quantitative characterisation (HR-DIC and HR-EBSD) and computational crystal plasticity which replicated the polycrystal morphology, texture and loading. Multiple crack nucleations occurred at the nickel matrix/inclusion interface and both nucleation and growth were found to be crystallographic with highest slip system activation driving crack direction. Local slip accumulation was found to be a necessary condition for crack nucleation, and that in addition, local stress and density of geometrically necessary dislocations are involved. However, the local stored energy density alone (of a Griffith-Stroh kind) unambiguously identified all the crack nucleation sites as those giving the highest magnitudes of stored energy.
||Planned: Supplemental Proceedings volume