a$)$ In Box $1$a below, three possible views of metallic castings are given, a section

of a cast ingot, a microstructure of a two$-$phase alloy, and another for a single phase

alloy. Features $A,B,C,D,E$ are highlighted. In the subsidiary answer boxes, place

the appropriate feature letter against the relevant associated feature name $($n$.$b$.$

letters can be used more than once$).$

$1$a$)$ Identify the features $[1$ mark per feature$]$

Type of feature

Interdendritic

Coring

porosity