TY - JOUR
T1 - Modification of Al-Si alloys with Ba, Ca, Y and Yb
AU - Knuutinen, A.
AU - Nogita, K.
AU - McDonald, S. D.
AU - Dahle, A. K.
N1 - Funding Information:
This research is sponsored by a Large Grant from the Australian Research Council. Anne Knuutinen would like to thank the CRC for Cast Metals Manufacturing (CAST) for hosting her exchange from Jönköping University (Sweden) to the University of Queensland. The authors would like to thank John Taylor for input on this manuscript.
PY - 2001/11
Y1 - 2001/11
N2 - Modification of Al-Si alloys is known to result in a depression of the eutectic arrest temperature. It has been suggested that a larger depression is related to increased modification. The effects of different concentrations of separate additions of Ba, Ca, Y and Yb on the eutectic arrest in an A356.0 (Al-7%Si-Mg) alloy have been studied by thermal analysis. All of these elements cause a depression of the eutectic arrest, however Ba and Ca result in fibrous eutectic Si while Y and Yb result in a refined plate-like eutectic silicon. Analysis of the effects of the elements on eutectic nucleation and growth temperatures and the recalescence shows two different trends. Addition of Ba and Yb both causes linear changes with increased concentration, while addition of Ca and Y result in an instantaneous effect with the first addition and no further significant changes with increased concentration.
AB - Modification of Al-Si alloys is known to result in a depression of the eutectic arrest temperature. It has been suggested that a larger depression is related to increased modification. The effects of different concentrations of separate additions of Ba, Ca, Y and Yb on the eutectic arrest in an A356.0 (Al-7%Si-Mg) alloy have been studied by thermal analysis. All of these elements cause a depression of the eutectic arrest, however Ba and Ca result in fibrous eutectic Si while Y and Yb result in a refined plate-like eutectic silicon. Analysis of the effects of the elements on eutectic nucleation and growth temperatures and the recalescence shows two different trends. Addition of Ba and Yb both causes linear changes with increased concentration, while addition of Ca and Y result in an instantaneous effect with the first addition and no further significant changes with increased concentration.
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U2 - 10.1016/S1471-5317(02)00004-4
DO - 10.1016/S1471-5317(02)00004-4
M3 - Article
AN - SCOPUS:0011998607
SN - 1471-5317
VL - 1
SP - 229
EP - 240
JO - Journal of Light Metals
JF - Journal of Light Metals
IS - 4
ER -