Formation of metastable phases and nanocomposite structures in rapidly solidified Al-Fe alloys

S. S. Nayak, H. J. Chang, D. H. Kim, S. K. Pabi, B. S. Murty

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29 Citations (Scopus)


In the present work the structure and morphology of the phases of nanocomposites formed in rapidly solidified Al-Fe alloys were investigated in details using analytical transmission electron microscopy and X-ray diffraction. Nanoquasicrystalline phases, amorphous phase and intermetallics like Al5Fe2, Al13F4 coexisted with α-Al in nanocomposites of the melt spun alloys. It was seen that the Fe supersaturation in α-Al diminished with the increase in Fe content and wheel speed indicating the dominant role of the thermodynamic driving force in the precipitation of Fe-rich phases. Nanoquasicrystalline phases were observed for the first time in the dilute Al alloys like Al-2.5Fe and Al-5Fe as confirmed by high resolution TEM. High hardness (3.57GPa) was measured in nanocomposite of Al-10Fe alloy, which was attributed to synergistic effect of solid solution strengthening due to high solute content (9.17at.% Fe), dispersion strengthening by high volume fraction of nanoquasicrystalline phase; and Hall-Petch strengthening from finer cell size (20-30nm) of α-Al matrix.

Original languageEnglish
Pages (from-to)5967-5973
Number of pages7
JournalMaterials Science and Engineering A
Issue number18
Publication statusPublished - 2011 Jul 15

Bibliographical note

Funding Information:
One of the authors (SSN) is grateful to Prof. D.H. Kim, Director; Center for Noncrystalline Materials (CNM), Yonsei University; South Korea for providing him the financial support to carry out this work. The present work is also partly sponsored by Department of Science and Technology (grant no. SR/S5/NM-S1/2002 ), India.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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