Rapid dendritic growth and solute trapping within undercooled ternary Ni-5%Cu-5%Mo alloy
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The dendritic growth velocity of α-Ni phase was measured as a function of undercooling in the nonequilibrium solidification process of an undercooled ternary Ni-5%Cu-5%Mo alloy. At the experimental maximum undercooling of 308 K (0.17T L), the dendritic growth velocity attains 32 m/s. With the increase of undercooling, a morphological transition from dendrites into equiaxed grains occurs. Furthermore, the high dendritic growth velocity leads to the significant solute trapping of Cu and Mo elements and almost segregationless solidification is realized at the maximum undercooling.
KeywordsRapid Solidification Dendritic Growth Misorientation Angle Electron Back Scatter Diffraction Electron Back Scatter Diffraction
The authors are grateful to Drs. F.P. Dai, W.L. Wang, and Y. Ruan for their help in the experiments and analysis. This research was supported by National Science Foundation of China under Grants Nos. 50971103 and 50971105.
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