June 8, 2021 @ 1pm CDT Online Seminar via ZOOM
The increasing complexity and severity of service conditions in areas such as aerospace and marine industries, nuclear systems, microelectronics, batteries, and biomedical devices etc., imposes great challenges on the reliable performance of metal subjected to simultaneous surface stress and corrosion. However, the design of strong and corrosion-resistant alloys, especially those containing lightweight elements such as Al are challenged by the tradeoff between strength and corrosion resistance. Solute tends to have a small equilibrium solubility limit in Al due to the relatively large negative enthalpy of mixing with Al. As a result, the formed precipitates strengthen the alloys, but compromises corrosion resistance due to their micro-galvanic coupling with the metal matrix. Towards this end, this talk will focus on the development of novel microstructure design strategies for metals to mitigate the combined attack of wear and corrosion (i.e. tribocorrosion) under harsh conditions. Two design strategies will be discussed to overcome this long-standing dilemma: by forming solid solution alloys and nanostructured multilayers. These studies provide insights for general design guidelines to engineer more robust, high-performance metals for use under harsh conditions.