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. (2011) Formation of metastable phases and nanocomposite structures in rapidly solidified Al-Fe alloys Materials Science and Engineering A, 528 (18). pp. 5967-5973. ISSN 0921-5093

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.msea.2011.04.028

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 (3.57 GPa) was measured in nanocomposite of Al-10Fe alloy, which was attributed to synergistic effect of solid solution strengthening due to high solute content (9.17 at.% Fe), dispersion strengthening by high volume fraction of nanoquasicrystalline phase; and Hall-Petch strengthening from finer cell size (20-30 nm) of α-Al matrix.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Rapid Solidification; Microstructure; Electron Microscopy; Quasicrystals; Hardness
ID Code:73882
Deposited On:08 Dec 2011 03:57
Last Modified:08 Dec 2011 03:57

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