Abstract Scope |
To make high-performance metallic alloys for extreme environments, the prediction and control of microstructure development with processing is needed. For example, solidification is the first step experienced by metallic alloys at elevated temperatures. The solid-liquid interface velocities and thermal gradients experienced will have a profound impact on microstructure selection, which impacts properties and will set the stage for subsequent microstructure development in the solid state. Improved understanding of phase transformations and microstructure development in conventional and model metallic alloys with processing, aided by in-situ/ex-situ characterization, is needed. In-situ imaging of solidification dynamics in Ni, Ti, and/or Al alloys, including during simulated additive manufacturing, and microstructure development in novel Ti and/or multi-principal element alloys during thermal cycling and/or thermomechanical processing in the solid state are highlighted. This new knowledge is needed to predict and control microstructure development and to design alloys and processes for performance in extreme environments. |