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Which among the following is an example of a non heat-treatable alloy?

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Which among the following is an example of a non heat-treatable alloy?

(a) Al-Cu

(b) Al-Li

(c) Al-Mg-Si

(d) Al-Mn

I got this question during an internship interview.

I need to ask this question 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) Al-Mn

Easiest explanation: Non heat-treatable alloys can be strengthened by cold-working operations. Al-Mn alloy is an example of a non heat-treatable alloy. The leftover choices are examples of heat-treatable alloys. Duralumin and Y-alloy are the important Al-Cu alloys.

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