Abstract
The solidification sequence of the icosahedral quasicrystal forming Al-Cu-Fe alloys was investigated as functions of cooling rate during solidification, compositional variation, and additional Si amount. Annealing treatment was also carried out to obtain the single icosahedral quasicrystalline phase. Two different formation mechanisms of the icosahedral quasicrystalline phase can be suggested as a function of cooling rate. For a moderate cooling rate regime, the icosahedral phase is formed by a peritectic reaction, which is consistent with the previous reports. For a high cooling rate regime, where large undercooling of the liquid is obtainable, the i-phase (icosahedral phase) is formed directly from the undercooled melt, without the formation of the primary λ or τ phases. The τ phase was formed at the inter-dendritic region of the i-phase grains from the remaining liquid at the final stage of solidification. As the Si element was added up to 5 at.%, the relative volume fraction of the i-phase gradually decreased in both as-cast and heat treated Al-Cu-Fe alloys. For an as-cast Al50Cu20Fe15Si15 alloy, however, the major phase was identified as an i-phase related 1/1 simple cubic approximant.
| Original language | English |
|---|---|
| Pages (from-to) | 871-878 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering A |
| Volume | 304-306 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2001 May 31 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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Solidification sequence of the icosahedral quasicrystal forming Al-Cu-Fe alloys. / Lee, S. M.; Jeon, H. J.; Kim, B. H.; Kim, W. T.; Kim, D. H.
In: Materials Science and Engineering A, Vol. 304-306, No. 1-2, 31.05.2001, p. 871-878.Research output: Contribution to journal › Article
TY - JOUR
T1 - Solidification sequence of the icosahedral quasicrystal forming Al-Cu-Fe alloys
AU - Lee, S. M.
AU - Jeon, H. J.
AU - Kim, B. H.
AU - Kim, W. T.
AU - Kim, D. H.
PY - 2001/5/31
Y1 - 2001/5/31
N2 - The solidification sequence of the icosahedral quasicrystal forming Al-Cu-Fe alloys was investigated as functions of cooling rate during solidification, compositional variation, and additional Si amount. Annealing treatment was also carried out to obtain the single icosahedral quasicrystalline phase. Two different formation mechanisms of the icosahedral quasicrystalline phase can be suggested as a function of cooling rate. For a moderate cooling rate regime, the icosahedral phase is formed by a peritectic reaction, which is consistent with the previous reports. For a high cooling rate regime, where large undercooling of the liquid is obtainable, the i-phase (icosahedral phase) is formed directly from the undercooled melt, without the formation of the primary λ or τ phases. The τ phase was formed at the inter-dendritic region of the i-phase grains from the remaining liquid at the final stage of solidification. As the Si element was added up to 5 at.%, the relative volume fraction of the i-phase gradually decreased in both as-cast and heat treated Al-Cu-Fe alloys. For an as-cast Al50Cu20Fe15Si15 alloy, however, the major phase was identified as an i-phase related 1/1 simple cubic approximant.
AB - The solidification sequence of the icosahedral quasicrystal forming Al-Cu-Fe alloys was investigated as functions of cooling rate during solidification, compositional variation, and additional Si amount. Annealing treatment was also carried out to obtain the single icosahedral quasicrystalline phase. Two different formation mechanisms of the icosahedral quasicrystalline phase can be suggested as a function of cooling rate. For a moderate cooling rate regime, the icosahedral phase is formed by a peritectic reaction, which is consistent with the previous reports. For a high cooling rate regime, where large undercooling of the liquid is obtainable, the i-phase (icosahedral phase) is formed directly from the undercooled melt, without the formation of the primary λ or τ phases. The τ phase was formed at the inter-dendritic region of the i-phase grains from the remaining liquid at the final stage of solidification. As the Si element was added up to 5 at.%, the relative volume fraction of the i-phase gradually decreased in both as-cast and heat treated Al-Cu-Fe alloys. For an as-cast Al50Cu20Fe15Si15 alloy, however, the major phase was identified as an i-phase related 1/1 simple cubic approximant.
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U2 - 10.1016/S0921-5093(00)01625-7
DO - 10.1016/S0921-5093(00)01625-7
M3 - Article
AN - SCOPUS:0011223667
VL - 304-306
SP - 871
EP - 878
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -