'Age hardening' of duralumin is due to____________________?
Correct answer: C. Both A. & B.
- A. Copper
- B. Magnesium
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
Duralumin is an aluminium-copper-magnesium alloy, and ageing increases its strength through precipitation of copper-rich and copper-magnesium-containing phases. Thus both copper and magnesium contribute to its age-hardening response.
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