Q17
An Al 4.5 mass% Cu alloy solutionising at 500°C, quenched to room temperature and aged at 200°C for 2 hrs is found to exhibit an increase in hardness. Theprimary mechanism contributing to increased hardness is
A.
martensitic transformation due to quenching
B.
solid solution strengthening
C.
precipitation hardening
AnswerD.
point defect strengthening
Answer: Option C
Solution
Answer: Option C
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