a$)$ Define the following terms; i$)$ grain, ii$)$ grain boundary, iii$)$ phase, iv$)$ solid solution

b$)$ What is the difference of compounds, alloys and intermetallics?

c$)$ Examine the unlimited solid solubility cases for the $Cu-Ni$ alloys by considering the Hume$-$

Rothery rules. ANSWER THE EACH QUEST$$ONS PLEASE