Effect of melt convection on the secondary dendritic arm spacing in peritectic Nd-Fe-B alloy

K. Biswas, R. Hermann, H. Wendrock, J. Priede, G. Gerbeth, B. Buechner

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    Dendrites are one of the major microstructural constituents of peritectic alloys. In the present work, the effect of melt convection on the secondary dendritic arm spacing (SDAS) and volume fraction of properitectic α-Fe was investigated during solidification of stoichiometric Nd-Fe-B alloys using the forced crucible rotation technique. The resulting microstructure of the alloy in consideration of melt convection has been investigated using scanning electron microscopy and optical microscopy. The average SDAS was determined for each sample from the whole cross-section of the cylindrical test samples using image analyzing software LEICA QWIN. A detailed statistical analysis of the spacing distribution was performed on the basis of the variation of SDAS values, averaged from about 80 to 120 dendrites in different zones. The α-Fe volume fraction, measured by vibrating sample magnetometer (VSM), reduces with increasing crucible rotation frequency. Similarly, the SDAS values decrease with increasing rotation frequency. These results are explained from the viewpoint of a reduced melt convection state under steady forced crucible rotation leading to a reduced effective mass transfer coefficient.

    Original languageEnglish
    Pages (from-to)295-298
    Number of pages4
    JournalJournal of Alloys and Compounds
    Volume480
    Issue number2
    Early online date6 Feb 2009
    DOIs
    Publication statusPublished - 8 Jul 2009

    Keywords

    • Melt-convection
    • Nd-Fe-B
    • Peritectic solidification
    • Secondary dendritic arm spacing

    ASJC Scopus subject areas

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

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