|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
||High throughput Study of Underlying Mechanisms of Serrated Flow in Nickel-based Diffusion Multiple via High Temperature Nanoindentation
||Bin Gan, Yuan Xiao, Miguel A. Monclus, Jeffrey M. Wheeler
|On-Site Speaker (Planned)
Ni-based superalloys are commonly used for manufacturing turbine disks of aero-engine, as they possess exceptional strength and ductility in elevated temperatures. In general, stress–strain curves of metallic structural materials have a smooth transition, but under certain temperatures and strain rates conditions, inhomogeneous deformation occurs in several nickel-based superalloys and results in serrated deformation curves. Such jerky flow behavior is detrimental to their ductility and severely impacts the safety of aero-engine. In this study, blocks of pure metals are assembled with pure nickel block to create a diffusion multiple. The solid solution regions of the inter-diffusion zones are assessed with the nanoindentation in a high throughput manner to establish the dependence of high temperature serrated flow behavior on alloy compositions and temperatures. The role played by dislocation-dislocation and solute-dislocation interactions in inducing the serrated flow is elucidated.
||Planned: Supplemental Proceedings volume