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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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
Volume528
Issue number18
DOIs
Publication statusPublished - 2011 Jul 15

Fingerprint

Metastable phases
Nanocomposites
nanocomposites
dispersion strengthening
Transmission electron microscopy
transmission electron microscopy
Supersaturation
supersaturation
wheels
Intermetallics
intermetallics
Solid solutions
Volume fraction
Wheels
solutes
solid solutions
hardness
Hardness
Thermodynamics
X ray diffraction

All Science Journal Classification (ASJC) codes

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

Cite this

Nayak, S. S. ; Chang, H. J. ; Kim, D. H. ; Pabi, S. K. ; Murty, B. S. / Formation of metastable phases and nanocomposite structures in rapidly solidified Al-Fe alloys. In: Materials Science and Engineering A. 2011 ; Vol. 528, No. 18. pp. 5967-5973.
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Formation of metastable phases and nanocomposite structures in rapidly solidified Al-Fe alloys. / Nayak, S. S.; Chang, H. J.; Kim, D. H.; Pabi, S. K.; Murty, B. S.

In: Materials Science and Engineering A, Vol. 528, No. 18, 15.07.2011, p. 5967-5973.

Research output: Contribution to journalArticle

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