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Aluminium alloys remain widely used in aircraft structures principally because of their

  • A.Superior stiffness compared with steel
  • B.Good specific strength at low cost
  • C.Very high melting point
  • D.Complete immunity to corrosion

Answer: B

Aluminium offers a good balance of specific strength, formability, joining, inspectability and cost, which composites match on weight but not on cost or ease of repair. Its stiffness is well below steel's, and it corrodes readily without protection.

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