_____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?
Correct answer: A. Strain ageing
- A. Strain ageing
- B. Screw dislocation
- C. Solid solution hardening
- D. Twinning
Explanation
Strain ageing occurs when a cold-worked material is heated moderately, allowing interstitial atoms such as carbon or nitrogen to lock dislocations. Strength and hardness rise while ductility falls, unlike solid-solution hardening or twinning.
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