Designing ceramics using processing and phase transformation

Dr. Alexander Dupuy

Professor
University of California, Irvine

Seminar Information

Seminar Series
Mechanics & Materials

Seminar Date - Time
January 9, 2023, 11:00 am
-
12:15

Seminar Location
von Karman-Penner Seminar Room
EBU2, Room 479
IN PERSON ONLY


Abstract

Processing and microstructure have become well established as one of the most important levers for controlling the properties and behavior of bulk polycrystalline ceramics. Of particular interest are metastable microstructures, such as nanocrystallinity, which often confer unique behavior and properties not available to ceramics processed using equilibrium methods. However, an even wider spectrum of control over functionality is available through the inclusion of phase transformations. Incorporation of phase transformations as part of the material design strategy, either during processing or during operation, can allow for tailoring of the microstructure and properties as well as outstanding practical performance. In this talk, I will provide two examples of how processing, microstructure, and phase transformations can be leveraged together to produce novel functionality. First, I will demonstrate that processing and phase transformations can enable exceptional Electro-Optic performance in lead-free ferroelectric polycrystalline ceramics. Then I will show how the entropic phase transformation can be used to tailor microstructure in High Entropy Oxides. Through these examples, I will motivate how including processing and phase transformations at the forefront of design will lead to ceramics with tailorable or emergent properties.

Speaker Bio

Dr. Alexander Dupuy is a project scientist in the Department of Materials Science and Engineering at the University of California, Irvine, where he studies the processing, properties, and phase transformation behavior of entropy stabilized oxides. He received his B.S in Mechanical Engineering from the University of California Riverside in 2009. His undergraduate research involved investigating gradient induced inhomogeneity found in the Current Activated Pressure Assisted Densification (CAPAD) process. He continued on to receive his M.S in Mechanical Engineering from UCR where he studied pressure induced densification mechanisms in nanomaterials processed using CAPAD. In 2016 he received his Ph.D. in Mechanical Engineering