Your company is considering creating an alumina coating by immersing an Fe-Si alloy into an Al melt, withdrawing the coated Fe-Si, and then oxidizing the Al coated alloy at 1000°C in air to form an alumina coating. In considering the advantages and disadvantages for the Al2O3 coating you are requested to explain the following issues:
A. What composition of the Fe-Si alloy must be used so as not to form a melt along the interface between the Fe-Si alloy and Al coating?
B. What phases will form along the Fe-Si/Al interface upon heating to 1000°C?
Explain the above technical discussions by using binary and ternary phase diagrams, as well as calculating the Al-C-O stability diagram at 1000°C, to support your views.