Abstract
The aging behavior of a cast Al-2 wt.% Fe alloy processed by High-Pressure Torsion (HPT) at room temperature was studied by subsequent aging treatments at 200 °C. Observations by Transmission Electron Microscopy (TEM) revealed that the microstructure after HPT processing reached an ultrafine-grained level with an average grain size in the Al matrix of ~120 nm. The initial eutectic structures were fragmented into particles with sizes of less than 400 nm and partially dissolved in the matrix up to a supersaturated Fe content of ~1% as confirmed by X-Ray Diffraction (XRD) analysis. The peak-age condition was achieved within 0.25 h of aging, which provides the maximum hardness of ~200 HV. Analyses by high-resolution S/TEM show that round particles of Al6Fe with sizes of ~5-10 nm and semi-coherent with the matrix are the dominant precipitates in the peak-aged condition. The hardness increases by aging for 12 h above the as-HPT-processed level of 185 HV. The dominant precipitate phase transforms to Al3Fe in the over-aged condition with a loss of coherency during growth. Enhanced precipitation kinetics was observed because of high density of lattice defects induced by the HPT processing, which were also confirmed by significant recovery in the electrical conductivity of the samples after aging.
| Original language | English |
|---|---|
| Title of host publication | Aluminium Alloys, ICAA 2014 |
| Publisher | Trans Tech Publications Ltd |
| Pages | 766-771 |
| Number of pages | 6 |
| ISBN (Print) | 9783038351207 |
| DOIs | |
| Publication status | Published - Jan 1 2014 |
| Event | 14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway Duration: Jun 15 2014 → Jun 19 2014 |
Publication series
| Name | Materials Science Forum |
|---|---|
| Volume | 794-796 |
| ISSN (Print) | 0255-5476 |
Other
| Other | 14th International Conference on Aluminium Alloys, ICAA 2014 |
|---|---|
| Country | Norway |
| City | Trondheim |
| Period | 6/15/14 → 6/19/14 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Aging and precipitation behavior in supersaturated Al-2%Fe alloy produced by high-pressure torsion. / Cubero-Sesin, Jorge M.; Watanabe, Masashi; Arita, Makoto; Horita, Zenji.
Aluminium Alloys, ICAA 2014. Trans Tech Publications Ltd, 2014. p. 766-771 (Materials Science Forum; Vol. 794-796).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Aging and precipitation behavior in supersaturated Al-2%Fe alloy produced by high-pressure torsion
AU - Cubero-Sesin, Jorge M.
AU - Watanabe, Masashi
AU - Arita, Makoto
AU - Horita, Zenji
PY - 2014/1/1
Y1 - 2014/1/1
N2 - The aging behavior of a cast Al-2 wt.% Fe alloy processed by High-Pressure Torsion (HPT) at room temperature was studied by subsequent aging treatments at 200 °C. Observations by Transmission Electron Microscopy (TEM) revealed that the microstructure after HPT processing reached an ultrafine-grained level with an average grain size in the Al matrix of ~120 nm. The initial eutectic structures were fragmented into particles with sizes of less than 400 nm and partially dissolved in the matrix up to a supersaturated Fe content of ~1% as confirmed by X-Ray Diffraction (XRD) analysis. The peak-age condition was achieved within 0.25 h of aging, which provides the maximum hardness of ~200 HV. Analyses by high-resolution S/TEM show that round particles of Al6Fe with sizes of ~5-10 nm and semi-coherent with the matrix are the dominant precipitates in the peak-aged condition. The hardness increases by aging for 12 h above the as-HPT-processed level of 185 HV. The dominant precipitate phase transforms to Al3Fe in the over-aged condition with a loss of coherency during growth. Enhanced precipitation kinetics was observed because of high density of lattice defects induced by the HPT processing, which were also confirmed by significant recovery in the electrical conductivity of the samples after aging.
AB - The aging behavior of a cast Al-2 wt.% Fe alloy processed by High-Pressure Torsion (HPT) at room temperature was studied by subsequent aging treatments at 200 °C. Observations by Transmission Electron Microscopy (TEM) revealed that the microstructure after HPT processing reached an ultrafine-grained level with an average grain size in the Al matrix of ~120 nm. The initial eutectic structures were fragmented into particles with sizes of less than 400 nm and partially dissolved in the matrix up to a supersaturated Fe content of ~1% as confirmed by X-Ray Diffraction (XRD) analysis. The peak-age condition was achieved within 0.25 h of aging, which provides the maximum hardness of ~200 HV. Analyses by high-resolution S/TEM show that round particles of Al6Fe with sizes of ~5-10 nm and semi-coherent with the matrix are the dominant precipitates in the peak-aged condition. The hardness increases by aging for 12 h above the as-HPT-processed level of 185 HV. The dominant precipitate phase transforms to Al3Fe in the over-aged condition with a loss of coherency during growth. Enhanced precipitation kinetics was observed because of high density of lattice defects induced by the HPT processing, which were also confirmed by significant recovery in the electrical conductivity of the samples after aging.
UR - http://www.scopus.com/inward/record.url?scp=84904389941&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84904389941&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.794-796.766
DO - 10.4028/www.scientific.net/MSF.794-796.766
M3 - Conference contribution
SN - 9783038351207
T3 - Materials Science Forum
SP - 766
EP - 771
BT - Aluminium Alloys, ICAA 2014
PB - Trans Tech Publications Ltd
ER -