Formation of Nanocrystalline F.C.C. Phase by Mechanically Driven Crystallization

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  • Wu N. Q.
    Department of Materials Science and Engineering, Zhejiang University
  • Wu J. M.
    Department of Materials Science and Engineering, Zhejiang University
  • Li Z. Z.
    Department of Materials Science and Engineering, Zhejiang University
  • Wang G.-X.
    Department of Materials Science and Engineering, Zhejiang University

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  • Formation of Nanocrystalline F.C.C.Phas

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Abstract

Ball milling has been performed on the Al–Ti and Al–Ti–C powder mixtures in a planetary ball mill. The structural changes of the as-milled powder samples have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and differential thermal analysis (DTA). The results obtained show that an amorphous phase is formed at an early milling stage, and transits later to a nanocrystalline f.c.c. metastable phases. In addition, crystallization of the amorphous phase upon heating results in the equilibrium phases instead of the f.c.c. phase. This indicates that the crystallization induced by ball milling is different from that by annealing. The contamination of nitrogen and oxygen has a significant influence on the crystallization during ball milling.

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