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

doi:10.1016/j.msea.2011.04.028

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

29 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 language	English
Pages (from-to)	5967-5973
Number of pages	7
Journal	Materials Science and Engineering A
Volume	528
Issue number	18
DOIs	https://doi.org/10.1016/j.msea.2011.04.028
Publication status	Published - 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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10.1016/j.msea.2011.04.028

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title = "Formation of metastable phases and nanocomposite structures in rapidly solidified Al-Fe alloys",

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.",

author = "Nayak, {S. S.} and Chang, {H. J.} and Kim, {D. H.} and Pabi, {S. K.} and Murty, {B. S.}",

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.",

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AU - Kim, D. H.

AU - Pabi, S. K.

AU - Murty, B. S.

N1 - 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.

PY - 2011/7/15

Y1 - 2011/7/15

N2 - 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.

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

Abstract

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