Quiz - Al-Si alloys question 1 of 2
Q1: in Al-Si die-castings, trace amounts of Sodium are added to modify the microstructure and improve properties. The Sodium:

increases the amount of primary Si

increases the eutectic temperature

refines the eutectic structure

none of the above
Quiz - Al-Si alloys question 2 of 2
Q2: in an Al-Si electrical bond, when silicon must solidify first on to a chip, would you choose:

Al-1%Si

Al-5%Si

Al-50%Si

none of the above