TY - JOUR
T1 - Phase transformation reactions in rapidly solidified Al-6.5Fe-1.5V alloys
AU - Tongsri, R.
AU - Minay, E.J.
AU - Thackray, R.P.
AU - Dashwood, R.J.
AU - Mcshane, H.B.
PY - 2001
Y1 - 2001
N2 - Phase transformation reactions, occurring during heating of as-atomised Al-6.5Fe-1.5V powders, extrusion of the powders, and heating of the as-extruded alloys produced from the powders, have been studied by DSC, XRD and TEM. The DSC studies of the as-atomised powders revealed several phase transformation reactions. The solid solution in zone A decomposed to form metastable phases at 360°C. These metastable phases further transformed to form equilibrium phases at 500°C. The microquasi-crystalline icosahedral (MI) phase particles present in zone A and zone B transformed to equilibrium phases at 500°C. The globular clusters of microquasi-crystalline icosahedral (GCMI) phase particles in zone C transformed polymorphously to icosahedral (I) phase particles at 450°C. These reactions were believed to occur during extrusion of the powders. During heating of the as-extruded alloys produced from coarse powder particles, I phase transformed polymorphously to hexagonal phase at 550°C. The hexagonal phase decomposed to monoclinic Al45(V, Fe)7 and Al13Fe4 phases upon heating for longer times.
AB - Phase transformation reactions, occurring during heating of as-atomised Al-6.5Fe-1.5V powders, extrusion of the powders, and heating of the as-extruded alloys produced from the powders, have been studied by DSC, XRD and TEM. The DSC studies of the as-atomised powders revealed several phase transformation reactions. The solid solution in zone A decomposed to form metastable phases at 360°C. These metastable phases further transformed to form equilibrium phases at 500°C. The microquasi-crystalline icosahedral (MI) phase particles present in zone A and zone B transformed to equilibrium phases at 500°C. The globular clusters of microquasi-crystalline icosahedral (GCMI) phase particles in zone C transformed polymorphously to icosahedral (I) phase particles at 450°C. These reactions were believed to occur during extrusion of the powders. During heating of the as-extruded alloys produced from coarse powder particles, I phase transformed polymorphously to hexagonal phase at 550°C. The hexagonal phase decomposed to monoclinic Al45(V, Fe)7 and Al13Fe4 phases upon heating for longer times.
U2 - 10.1023/A:1017982218746
DO - 10.1023/A:1017982218746
M3 - Article
SN - 0022-2461
SN - 1573-4803
VL - 36
SP - 3197
EP - 3206
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 13
ER -