Crystalline metal can be transformed into metallic glass by :

alloying

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pressing into thin plates

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slow cooling of molten metal

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very rapid cooling of molten metal

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Solution

The correct option is D very rapid cooling of molten metal
Crystalline metal can be transformed into a metallic glass by very rapid colling of molten metal. On rapid cooling of molten metal gives amorphous solid which is nothing but metallic glass.
Hence option $D$ is correct.

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