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Which aluminum alloy is known as aircraft aluminum?

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in Engineering Material & Metallurgy by (773k points)
Which aluminum alloy is known as aircraft aluminum?

(a) 6061

(b) 6063

(c) 7068

(d) 7075

This question was addressed to me in final exam.

The doubt is from Aluminium and its Alloys, Zinc and its Alloys in chapter Non Ferrous Materials of Engineering Material & Metallurgy

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The correct option is (d) 7075

To explain: Aluminum alloy 7075 consists of zinc as its primary element, along with a bit of magnesium and copper. Due to its high strength and good corrosion resistance, it is often used in aircraft, and also known as aerospace aluminum. However, the other alloys are also employed in a few aerospace functions and structures.

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