Rapid solidification mechanism of Ag60Sb34Cu6 ternary alloy in drop tube
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Droplets of Ag60Sb34Cu6 ternary alloy within the diameter range of 60–800 μm were rapidly solidified by means of drop tube containerless processing, and the solidification mechanism is analyzed. With a decrease in droplet size, the cooling rate increases from 57 to 5.8×104 K/s. The maximum undercooling is determined to be 180 K (0.23T L) and the microstructure of primary ε(Ag3Sb) dendrite refines drastically until homogenous equiaxed dendrite forms. Experimental results indicate that (ε+Ag) pseudobinary eutectic cannot form under high undercooling conditions and the solubility of Ag in primary ε phase increases as undercooling increases. Based on thermal analysis and crystal growth morphology, it is found that this alloy is solidified in two ways corresponding to different undercooling levels.
Keywordsternary eutectic growth high undercooling rapid solidification crystal nucleation
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- 8.Dutta, B., Rettenmayr, M., Effect of cooling rate on the solidification behavior of Al-Fe-Si alloys, Mater. Sci. Eng., 2000, 283A: 218–224.Google Scholar
- 10.Wang, H. P., Cao, C. D., Wei, B., Rapid monotectic solidification during free fall in a drop tube, Chin. Sci. Bull., 2004, 49: 220–224.Google Scholar
- 13.Dutkiewicz, J., Massalski, T. B., Search for metallic glasses at eutectic compositions in the Ag-Cu-Ge, Ag-Cu-Sb and Ag-Cu-Sb-Ge systems, Metall Trans. A, 1981, 12A: 773–778.Google Scholar
- 14.Rogers, J. R., Davis, R. H., Modeling of collision and coalescense of droplets during microgravity processing of Zn-Bi immiscible alloys, Metall Trans. A, 1990, 21A: 59–68.Google Scholar