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What should be the temperature of the mixture while alloying takes place?

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in Casting-Forming-Welding II by (119k points)
What should be the temperature of the mixture while alloying takes place?

(a) 550°C

(b) 600°C

(c) 650°C

(d) 700°C

The question was posed to me in an online interview.

Query is from Magnesium Alloys in division Foundry Introduction & Materials of Casting-Forming-Welding II

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Right option is (d) 700°C

The best I can explain: During the mixture getting processed, first the magnesium is melted, and then zinc metal is added. Aluminum is mixed in it through stirring. While this is happening, it has to be ensured, that the complete alloying process takes place at 700°C.

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