Abstract
Directional solidification studies have been carried out in Succinonitrile -0.04 to 3.0mol% acetone alloy in small channels at the condition from planer to dendritic interface growth in order to clarify the solutal and geometrical influences of narrow fibers interstices on the microstructure of matrix alloys and to optimize high-performance Metal Matrix Composites. The specimens were designed to have an inner composite region and an outer un-reinforced bulk region in order to make a comparison of the interfacial morphology under the same thermal conditions. In the composite region of the specimens, the tip radius of cell increased with increasing the tube diameter and decreasing the number of cell, The concentration of acetone at the cell tips in 200 urn diameter-tube is estimated three times higher than bulk composition, and the tip composition increases as the tube diameter becomes smaller. The solutal undercooling is estimated to be 1.8K by the tip radius, that indicates the trapped solutal diffusion field might govern the cell tip undercooling and tip radius. Secondary dendrite arm spacing stabilized more uniformly in the glass tubes, when the tube size is designed less than primary dendrite arm spacing. Solute pile-up between the dendrite tip and inner wall of tube interrupts the secondary dendrite arm coarsening. However, the coarsening of secondary dendrite arm becomes remarkable if the tube diameter is larger than the primary arm spacing and no interference of any other dendrites occurs.
| Original language | English |
|---|---|
| Pages (from-to) | 2703-2708 |
| Number of pages | 6 |
| Journal | Materials Science Forum |
| Volume | 475-479 |
| Issue number | IV |
| Publication status | Published - Apr 25 2005 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Solidification interface morphology in narrow channel during unidirectional solidification. / Miyahara, Hirofumi; Ogi, Keisaku.
In: Materials Science Forum, Vol. 475-479, No. IV, 25.04.2005, p. 2703-2708.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Solidification interface morphology in narrow channel during unidirectional solidification
AU - Miyahara, Hirofumi
AU - Ogi, Keisaku
PY - 2005/4/25
Y1 - 2005/4/25
N2 - Directional solidification studies have been carried out in Succinonitrile -0.04 to 3.0mol% acetone alloy in small channels at the condition from planer to dendritic interface growth in order to clarify the solutal and geometrical influences of narrow fibers interstices on the microstructure of matrix alloys and to optimize high-performance Metal Matrix Composites. The specimens were designed to have an inner composite region and an outer un-reinforced bulk region in order to make a comparison of the interfacial morphology under the same thermal conditions. In the composite region of the specimens, the tip radius of cell increased with increasing the tube diameter and decreasing the number of cell, The concentration of acetone at the cell tips in 200 urn diameter-tube is estimated three times higher than bulk composition, and the tip composition increases as the tube diameter becomes smaller. The solutal undercooling is estimated to be 1.8K by the tip radius, that indicates the trapped solutal diffusion field might govern the cell tip undercooling and tip radius. Secondary dendrite arm spacing stabilized more uniformly in the glass tubes, when the tube size is designed less than primary dendrite arm spacing. Solute pile-up between the dendrite tip and inner wall of tube interrupts the secondary dendrite arm coarsening. However, the coarsening of secondary dendrite arm becomes remarkable if the tube diameter is larger than the primary arm spacing and no interference of any other dendrites occurs.
AB - Directional solidification studies have been carried out in Succinonitrile -0.04 to 3.0mol% acetone alloy in small channels at the condition from planer to dendritic interface growth in order to clarify the solutal and geometrical influences of narrow fibers interstices on the microstructure of matrix alloys and to optimize high-performance Metal Matrix Composites. The specimens were designed to have an inner composite region and an outer un-reinforced bulk region in order to make a comparison of the interfacial morphology under the same thermal conditions. In the composite region of the specimens, the tip radius of cell increased with increasing the tube diameter and decreasing the number of cell, The concentration of acetone at the cell tips in 200 urn diameter-tube is estimated three times higher than bulk composition, and the tip composition increases as the tube diameter becomes smaller. The solutal undercooling is estimated to be 1.8K by the tip radius, that indicates the trapped solutal diffusion field might govern the cell tip undercooling and tip radius. Secondary dendrite arm spacing stabilized more uniformly in the glass tubes, when the tube size is designed less than primary dendrite arm spacing. Solute pile-up between the dendrite tip and inner wall of tube interrupts the secondary dendrite arm coarsening. However, the coarsening of secondary dendrite arm becomes remarkable if the tube diameter is larger than the primary arm spacing and no interference of any other dendrites occurs.
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M3 - Article
AN - SCOPUS:17044364401
VL - 475-479
SP - 2703
EP - 2708
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
IS - IV
ER -