AlNiY chill-zone alloys with good mechanical properties

Yan Li, Konstantinos Georgarakis, Shujie Pang, Jerzy Antonowicz, Frederic Charlot, Alain LeMoulec, Tao Zhang, Alain Reza Yavari

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Using cold graphite mold casting method, Al-based chill-zone alloys cylinders of millimeter scale thickness [Y. Li, K. Georgarakis, S.J. Pang, A. LeMoulec, T. Zhang, A.R. Yavari, unpublished research.] were prepared. Using high-resolution scanning electron microscopy (HRSEM), it was found that hard submicron crystalline surface layers of thickness about 200 μm form when the melt can be undercooled. The structure and the thermal properties of the chill-zone alloy were examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). A metastable phase Al19Ni5Y3 nucleated during cooling then transformed to equilibrium intermetallics after annealing. The chill-zone alloy shows high mechanical strength in excess of 1 GPa at high ambient temperatures and good plasticity. The combination of high strength and good plasticity will be discussed in relation to the special structure of the chill-zone alloy.

    Original languageEnglish
    Pages (from-to)346-349
    Number of pages4
    JournalJournal of Alloys and Compounds
    Volume477
    Issue number1-2
    DOIs
    Publication statusPublished - 2009 May 27

    Keywords

    • Al-Ni-Y
    • Chill-zone alloy
    • HRSEM
    • Mechanical property
    • Metastable phase

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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