TY - GEN
T1 - Influence of gravity on monotectic and eutectic growth
AU - Aoi, Ichiro
AU - Yoshida, Makoto
AU - Ishino, Makoto
AU - Nakae, Hideo
PY - 2000/12/1
Y1 - 2000/12/1
N2 - The influence of gravity on the microstructure of unidirectionally solidified Cu-Pb monotectic, Ag-Si and Fe-C eutectic alloys is studied. In order to examine the influence of gravity in a 1 g environment, both the upward (opposite to direction of gravity) and downward (direction of gravity) unidirectional solidifications are carried out. The results are as follows: (1) For the upward solidified Ag-Si eutectic alloy, the eutectic Si continuously grows. On the other hand, in the downward solidified Ag-Si alloy, the Si grows discontinuously and disperses into the α-Ag matrix. (2) No morphological difference in the eutectic growth is observed between the upward and downward solidified Fe-C eutectic alloys. (3) In the case of the upward solidified Cu-Pb monotectic alloy, a banded structure, which consists of Pb-rich layers and Cu-rich layers, is observed. However, such a banded structure is not observed in the downward specimen. (4) The banded structure is not found in the upward solidified Cu-Pb-0.05 mass%Al and Cu-Pb-0.1 mass%al alloys. In the Cu-Pb-0.05 mass%Al alloy, a fibrous L2 phase grows continuously parallel to the growth direction at low growth rate. Only 500 mass ppm addition of aluminum induces the morphological change of the monotectic L2 phase.
AB - The influence of gravity on the microstructure of unidirectionally solidified Cu-Pb monotectic, Ag-Si and Fe-C eutectic alloys is studied. In order to examine the influence of gravity in a 1 g environment, both the upward (opposite to direction of gravity) and downward (direction of gravity) unidirectional solidifications are carried out. The results are as follows: (1) For the upward solidified Ag-Si eutectic alloy, the eutectic Si continuously grows. On the other hand, in the downward solidified Ag-Si alloy, the Si grows discontinuously and disperses into the α-Ag matrix. (2) No morphological difference in the eutectic growth is observed between the upward and downward solidified Fe-C eutectic alloys. (3) In the case of the upward solidified Cu-Pb monotectic alloy, a banded structure, which consists of Pb-rich layers and Cu-rich layers, is observed. However, such a banded structure is not observed in the downward specimen. (4) The banded structure is not found in the upward solidified Cu-Pb-0.05 mass%Al and Cu-Pb-0.1 mass%al alloys. In the Cu-Pb-0.05 mass%Al alloy, a fibrous L2 phase grows continuously parallel to the growth direction at low growth rate. Only 500 mass ppm addition of aluminum induces the morphological change of the monotectic L2 phase.
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M3 - Conference contribution
AN - SCOPUS:0034592357
SN - 087339495X
T3 - Proceedings of the Second International Conference on Processing Materials for Properties
SP - 1017
EP - 1022
BT - Proceedings of the Second International Conference on Processing Materials for Properties
A2 - Mishra, B.
A2 - Yamauchi, C,
A2 - Mishra, B.
A2 - Yamauchi, C.
T2 - Proceedings of the Second International Conference on Processing Materials for Properties
Y2 - 5 November 2000 through 8 November 2000
ER -