| Abstract Scope |
Prof. John Dupont has pioneered the science and technology of manufacturing the components with small and large gradients in alloying element concentrations to arrive at site-specific mechanical properties within engineered components. The challenges in realizing these gradients and their stability at high temperature service were addressed by him and his mentees by using comprehensive research involving computational thermodynamics and kinetics, as well as detailed characterization. With his foundational contribution to this field related to interface and phase stability in these dissimilar materials, a welding metallurgist can design and manufacture a wide range of components, using welding technology, to meet both low- and high-temperature properties relevant for components to be placed in extreme environments. His research approach is currently being used to realize the hybrid materials for both functional and mechanical properties.
First, I will present the summary of existing thermodynamic and kinetic models to design the functionally gradient dissimilar materials. I will focus on predicting the phase stability as a function of temperature and time. I will discuss the extension of these models to increased complexity of dissimilar materials in all three dimensions, i.e., voxels. I will highlight the advances made in in-situ and ex-situ characterization of these dissimilar material combinations to validate these models.
Second, I will discuss the existing and emerging additive manufacturing processes that will enable voxel-by-voxel control of elemental composition within a component. I will focus on the length scales and approaches based on fusion, solid state and melt infiltration technologies based on Binder Jet.
Finally, I would like to honor the dedication of Prof. Dupont’s to impart high quality education to diverse students pursuing welding and materials science. I will propose a citizen science approach to expand the reach of the metallurgy skills beyond our universities.
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