Commercial brasses are copper-rich copper-zinc alloys

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Presentation transcript:

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

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

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

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