Crystal nucleation in metallic alloys using x-ray radiography and machine learning

Enzo Liotti, Carlos Arteta, Andrew Zisserman, Andrew Lui, Victor Lempitsky, Patrick S. Grant

    Research output: Contribution to journalArticlepeer-review

    57 Citations (Scopus)

    Abstract

    The crystallization of solidifying Al-Cu alloys over a wide range of conditions was studied in situ by synchrotron x-ray radiography, and the datawere analyzed using a computer vision algorithm trained usingmachine learning. The effect of cooling rate and solute concentration on nucleation undercooling, crystal formation rate, and crystal growth rate wasmeasured automatically for thousands of separate crystals, which was impossible to achieve manually. Nucleation undercooling distributions confirmed the efficiency of extrinsic grain refiners and gave support to the widely assumed free growth model of heterogeneous nucleation. We show that crystallization occurred in temporal and spatial bursts associated with a solute-suppressed nucleation zone.

    Original languageEnglish
    Article numbereaar4004
    JournalScience Advances
    Volume4
    Issue number4
    DOIs
    Publication statusPublished - 13 Apr 2018

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