ISRO Mechanical & Aerospace 2009 - Question 37

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Addition of copper to aluminium results in

  • A. Precipitation hardening system
  • B. Corrosion resistance
  • C. Grain refinement
  • D. High machinability

Answer: A. Precipitation hardening system

Explanation: Al-Cu alloys (like Duralumin) are heat treatable via precipitation hardening.

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