Professor A. Lindsay Greer

Department of Materials Science & Metallurgy

University of Cambridge, UK

Friday, March 1

11:00 a.m. - 214 Mudd and Zoom

Extending the range of the glassy state in metals, and hypernucleation of crystals

Abstract: The first part of the talk focuses on thermomechanical processing (TMP) of metallic glasses to achieve a

wide range of states at a given composition. The complexity of thermal expansion is revealed, including through

transient energy storage [1,2]. TMP in compression can greatly rejuvenate a metallic glass, ultimately rendering it

capable of strain-hardening (instead of the usual strain-softening) [3]. This hardening is by a mechanism that is

entirely different from that explained by G.I. Taylor 90 years ago. The second part of the talk focuses on a category

of heterogeneous nucleation of crystals where the contact angle is zero, and the barrier to effective nucleation relates

to the size of the nucleant template. This has been explored in depth for the grain-refinement of aluminum alloys [4].

A similar analysis is useful in understanding ice nucleation and glass formation in living systems: new, unpublished

work links the action of apparent opposites: ice-nucleating agents (INAs) and antifreeze proteins (AFPs).

Bio:A. Lindsay Greer is a professor of Materials Science at the University of Cambridge. He received his MA and PhD degrees from

Cambridge, and holds Honorary Doctorates from AGH University of Science & Technology, Cracow, Poland, and the University of Sofia,

Bulgaria. He was an assistant professor at Harvard University, has held visiting positions in Grenoble, St. Louis, Vienna and Turin, and is

a foreign principal investigator in the Advanced Institute for Materials Research, Tohoku University, Japan. His research focuses on

microstructural kinetics and the glassy state.

Join Zoom Meeting
https://columbiauniversity.zoom.us/j/95565566017?pwd=M2RnLzRsRXF6dlZiaGRPeTB6YUFEdz09

Meeting ID: 955 6556 6017
Passcode: 483175