TY - JOUR
T1 - Quasicrystal-forming ability of the icosahedral phase in Al-Cu-Fe-Be alloys
AU - Song, G. S.
AU - Fleury, E.
AU - Lee, S. M.
AU - Kim, W. T.
AU - Kim, D. H.
PY - 2003/4/15
Y1 - 2003/4/15
N2 - The effect of Be (beryllium) addition and the influence of cooling rate on the solidification path of the icosahedral (i) phase in conventional casting Al62-xBexCu25.5Fe12.5 (x=0,1,3,5,7 at.%) alloys were investigated by means of X-ray diffraction, differential thermal analysis, SEM and EDX analyses. The addition of Be has been found to modify the i-phase formation mechanism from peritectic reaction to primary solidification. The volume fraction of the i-phase has been observed to increase from 45% for x=0 to 90% for x=7. These results suggested that the substitution of Al by Be is favorable for the increase of the quasicrystal-forming ability (QFA) of the i-phase. Two parameters have been proposed for defining and assessing the QFA for i-phase formed by peritectic reaction. These parameters can be expressed by the reduced quasicrystal transition temperature Trq=Tp/Tl and the reduced undercooling ΔTr=ΔTlp/Tl, respectively, (Tl: Liquidus temperature, Tp: Peritectic peak temperature, and ΔTlp=Tl - Tp: Freezing range of primary phase).
AB - The effect of Be (beryllium) addition and the influence of cooling rate on the solidification path of the icosahedral (i) phase in conventional casting Al62-xBexCu25.5Fe12.5 (x=0,1,3,5,7 at.%) alloys were investigated by means of X-ray diffraction, differential thermal analysis, SEM and EDX analyses. The addition of Be has been found to modify the i-phase formation mechanism from peritectic reaction to primary solidification. The volume fraction of the i-phase has been observed to increase from 45% for x=0 to 90% for x=7. These results suggested that the substitution of Al by Be is favorable for the increase of the quasicrystal-forming ability (QFA) of the i-phase. Two parameters have been proposed for defining and assessing the QFA for i-phase formed by peritectic reaction. These parameters can be expressed by the reduced quasicrystal transition temperature Trq=Tp/Tl and the reduced undercooling ΔTr=ΔTlp/Tl, respectively, (Tl: Liquidus temperature, Tp: Peritectic peak temperature, and ΔTlp=Tl - Tp: Freezing range of primary phase).
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U2 - 10.1016/S0921-5093(02)00536-1
DO - 10.1016/S0921-5093(02)00536-1
M3 - Article
AN - SCOPUS:0037447413
SN - 0921-5093
VL - 346
SP - 42
EP - 49
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -