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Which of these is not a property of duralumin?

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Which of these is not a property of duralumin?

(a) High strength

(b) 1/3 the weight of steel

(c) Excellent casting and forging abilities

(d) Poor machinability

The question was posed to me by my school teacher while I was bunking the class.

This interesting question is from Aluminium and its Alloys, Zinc and its Alloys topic in division Non Ferrous Materials of Engineering Material & Metallurgy

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The correct answer is (d) Poor machinability

The explanation is: Duralumin contains 4% Cu along with 0.4-0.7% of both Mn and Mg. This provides it excellent casting and forging abilities and high strength while maintaining only 1/3 of the weight. It also possesses high machinability.

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