Smoothing metallic glasses without introducing crystallization by gas cluster ion beam

Lin Shao, Di Chen, Michael Myers, Jing Wang, Buddhi Tilakaratne, Dharshana Wijesundera, Wei Kan Chu, Guoqiang Xie, Arezoo Zare, Don A. Lucca

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    We show that 30 keV Ar cluster ion bombardment of Ni52.5Nb 10Zr15Ti15Pt7.5 metallic glass (MG) can remove surface mountain-like features and reduce the root mean square surface roughness from 12 nm to 0.7 nm. X-ray diffraction analysis reveals no crystallization after cluster ion irradiation. Molecular dynamics simulations show that, although damage cascades lead to local melting, the subsequent quenching rate is a few orders of magnitude higher than the critical cooling rate for MG formation, thus the melted zone retains its amorphous nature down to room temperature. These findings can be applied to obtain ultra-smooth MGs without introducing crystallization.

    Original languageEnglish
    Article number101604
    JournalApplied Physics Letters
    Volume102
    Issue number10
    DOIs
    Publication statusPublished - 2013 Mar 11

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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