Question

Problem 3 A binary system of atoms A and B has a simple eutectic phase diagram (as shown below). The ternary solid solutions are a and R Let an A-rich sample of the composition indicated by the vertical line be solidified from the medt. It is found that its microstructure depends strongly on how rapidly it is cooled. Slow cooling leads to a polygranular structure of grains with small β grains dispersed throughout. Fast cooling leads to a dendritic structure of α grains with very fine β precipitates within the dendrites and eutectic constituent in the boundaries between the dendrites. Discuss how these two microstructures might form ME213 Properties of Materials POL end of problem set 5

Answer 1