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______ is added to aluminum alloys to reduce the coefficient of expansion.

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in Food Packaging Technology by (63.0k points)
______ is added to aluminum alloys to reduce the coefficient of expansion.

(a) Zinc

(b) Chromium

(c) Nickel

(d) Manganese

The question was asked in examination.

Query is from Metal as Packaging Material topic in portion Metal Packaging Materials of Food Packaging Technology

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Right option is (c) Nickel

Explanation: Nickel is added to aluminum alloys to reduce the coefficient of expansion. It also improves hardness and strength at elevated temperatures. Nickel is also added to aluminum-copper and aluminum-silicon alloys for the same.

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