A fine powder of a refractory metal may be added to a molten

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A fine powder of a refractory metal may be added to a molten metal prior to solidification of the metal. The fine powder may act to:

1. produce a single crystal. This is called a Czochalski technique.
2. induce homogeneous nucleation in the molten metal
3. reduce the average grain size of the final, solidified metal
4. produce large numbers of moving dislocations in the crystal

Correct Option: C

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