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1 Materials Science Poland

1 2007

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The solidification of CuCr alloys under various cooling rates

Wang Y., Song X., Sun Z., Zhou X., Guo J.

Materials Science Poland

2007

Vol. 25, No. 1

199--207

The paper focuses on the solidification especially on the liquid phase separation of Cu-35 at. % Cr alloys under various cooling rates. When the solidification temperature is below the liquidus and above the spinodal temperature, solidification runs normally, with the growth of primary Cr-rich dendrites. When the solidification temperature is below the spinodal temperature, liquid phase separation should occur through the solidification process and the primary Cr-rich phase has a special nodular structure under an appropriate cooling rate. Large Cr-rich particles obtained from liquid phase separation can grow by absorbing smaller ones via the transfer of matter. Furthermore, some particles collide with each other, mutually losing surface energy by joining to form a single particle. The size of the Cr-rich particles obtained from liquid phase separation decreases with increasing cooling rate. Using thermodynamic calculations and referring to literature data, the viewpoints on liquid phase separation are systematized and applied to the CuCr system. Liquid phase separation in an undercooled liquid is not advantageous in refining the microstructure of alloys and should be restricted.