1. The copper-zinc phase diagram: Terminal and Intermediate Solid Solutions
Commercial brasses are copper-rich copper-zinc alloys. For example, cartridge brass is 70 wt% copper-30 wt% zinc 15

2. The magnesium-lead phase diagram: like two simple eutectic diagrams joined back to back
Melting temperature of Mg2Pb 550 oC)
Limited Mg solubility
Extensive solubility
of Pb in Mg
Intermetallic compound (with distinct chemical formula), NOT a solid solution.
It is 19 wt% Mg-81 wt% Pb
can be considered as a component
of the phase diagrams 16

3. EUTECTIC and PERITECTIC REACTIONS
Eutectic transformation also called eutectic reaction
A eutectic reaction is an invariant reaction, and a eutectic point is also called an invariant point
the horizontal tie line at the eutectoid temperature is termed a eutectoid isotherm
Point P represents a peritectic reaction 15