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Solidification of metallic alloys: Does the structure of liquid matter?

Solidification of metallic alloys: Does the structure of liquid matter?

Date & Time:
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Location:

ETB (Engineering Technology Building) Room 126

Event Contact:

Dr. Andre Phillion

Department of Materials Science and Engineering

philliab@mcmaster.ca

Ext. 24046

Solidification of metallic alloys: Does the structure of liquid matter?

Overview

Abstract:

In 1952,  Frank postulated that Icosahedral Short-Ranger Order (ISRO) of atoms in the liquid might exist. If ISRO is responsible of the formation of quasicrystals (QC), it has been shown recently that it also induces a so-called "QC-mediated nucleation" of the fcc phase during solidification of metallic alloys. This refines the grain structure and induces a large percentage of twinned grain boundaries. ISRO has been found to also affect the growth morphology and growth kinetics of dendrites and is a key parameter in understanding twinned dendrites formation in Al alloys. This presentation will show how ISRO can affect the solidification of the fcc phase