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How can the ductility of tungsten be improved?

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How can the ductility of tungsten be improved?

(a) Cold working

(b) Condensation

(c) Hot working

(d) Forming

This question was posed to me during an online exam.

I'm obligated to ask this question of Refractory Materials, Superalloys in section Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Right choice is (a) Cold working

Explanation: Due to the nature of tungsten, it has a low ductility and malleability at room temperature. Its ductility can be enhanced by lowering the recrystallization temperature. This can be achieved by cold working, which lowers the temperature from 600^oC to 190^oC.

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