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Which of the following can be applied to prevent ductile fracture?

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Which of the following can be applied to prevent ductile fracture?

(a) Fine grains

(b) Low hardness

(c) Low Young’s modulus

(d) High-temperature treatment

I got this question during an internship interview.

This intriguing question comes from Fracture Toughness, Protection against Fracture in chapter Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Best answer
The correct choice is (a) Fine grains

The best explanation: To prevent ductile fracture, the material must have fine grains, a high hardness value, and must not show any defects or dislocations. Additionally, it is preferred that the material has high Young’s modulus and cohesive energy.

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