Question

In general, magnesium alloy components tends to have fine grain structure in it.

(a) True

(b) False

This question was addressed to me in a job interview.

My query is from Magnesium Alloys topic in chapter Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

The correct choice is (b) False

To explain: In general, magnesium alloy component tends to have coarse grain structure unless some suitable procedures are taken to insure the formation of fine grains. The procedure involves superheating of molten metal to 2500 or 3000 ⁰C. And then after holding it there for a certain period of time, it cools down to the desired temperature and pouring operation takes place without any delay.