The addition of alloying elements to high carbon steel alloys increase their wear resistance, due to

12 – On modern large aeroplanes structure where can we find a more frequent use oftitanium alloys? And why is that?

a) Explain why work hardenable aluminium alloys cannot be age-hardened because the precipitation hardening reaction does not occur. To maintain strength, what might be another reason why aluminium alloys can't be work hardened? (Think about dislocations.)