|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Influence of Grain Boundary Transport on Transient Oxidation
||Pralav Shetty, Jessica A Krogstad
|On-Site Speaker (Planned)
||Jessica A Krogstad
Despite being only a small fraction of the overall lifetime of a given component, the transient stages of oxidation prior to the formation of a continuous scale, can dramatically influence the type, adherence and the longer-term growth kinetics of the developing scale. Here we explore the earliest stages of oxidation, by focusing on mass transport both to and along grain boundaries in nanocrystalline alloys. Physical vapor deposition methods have been used to fabricate nanocrystalline Ni-based alloy thin films. Free-standing films were subjected to conventional weight-gain experiments using thermogravimetric analysis and then correlated with in situ (environmental) transmission electron microscopy experiments. We show that mass transport along the high density of grain boundaries towards the oxidizing surface can be tuned by slightly modifying the grain boundary chemistry. This is similar to the thermodynamic approach of nanocrystalline grain boundary stabilization for improved mechanical performance.