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Which of the given metals is not counted among late additions in aluminium alloys?

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Which of the given metals is not counted among late additions in aluminium alloys?

(a) Boron

(b) Titanium

(c) Manganese

(d) Sodium

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This question is from Aluminium and Its Alloys in division Foundry Introduction & Materials of Casting-Forming-Welding II

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The correct option is (c) Manganese

Explanation: There are certain metals which are added very late in the molten cast. By doing this, aluminium alloys get refined. A few of those metals are, boron, titanium, sodium, chromium and columbium. Manganese is added in aluminium during the operation, not late.

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