VIRTUAL: Department Seminar with James R. Morris: High entropy alloys: theoretical insights into experimental observations

Date/Time
Date(s) - 8 Mar 2021 until 8 Mar 2021
3:20 PM - 4:10 PM

Location

This is a webinar event.

Speaker: James R. Morris, Chief Research Officer at Ames Laboratory

Title: High entropy alloys: theoretical insights into experimental observations

Abstract: One of the traditional challenges of alloy design is to discover and design new compositions that lead to new behaviors. While alloys of practical use have long relied upon many elemental components, recent work has demonstrated that new properties may emerge, based on multicomponent interactions. I will focus on high entropy alloys, where there is no clear distinction between “solute” and “solvent” species. These materials have surprising properties, including a remarkable combination of low temperature strength and ductility. More broadly, these alloys are providing new insights into unexpected solid solution behaviors, and leading to new opportunities for alloy design. The talk will touch on issues of phase prediction, including: identification of potential single-phase compositions, phase transformations in multicomponent alloys, and novel ways that chemical disorder can stabilize a particular phase. I will also talk about behavior of these alloys, and how they are leading the community to re-think “common knowledge” of alloy behaviors.

Bio: James Morris’ research has focused on a variety of materials science challenges, including alloy design, high entropy alloys, metallic liquids and glasses, and hydrogen storage and other confined fluids in porous media. He earned his B.S. in physics at Colorado State University in 1987, and his Ph.D. in theoretical physics from Cornell University in 1992. He worked at Ames Laboratory, a Department of Energy (DOE) Laboratory located at Iowa State University, first as a postdoctoral associate then as a scientific staff member. In 2003, he joined the Alloy Behavior and Design group at Oak Ridge National Lab (ORNL), and in 2005 also became joint faculty with the University of Tennessee’s Materials Science and Engineering department. At ORNL, Morris served as Deputy Director for the DOE Energy Frontier Research Center for Defect Physics, as Lab Coordinator for the Basic Energy Sciences – Materials Science and Engineering program, and as Materials Theory Group Leader. In 2019, Morris returned to Ames Lab where he presently serves as Chief Research Officer.

Seminar Host: Xiaoli Tan

Zoom Link: https://iastate.zoom.us/j/96898018007

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