Samples of cartridge brass (Cu-30% Zn) were cold rolled and then annealed for one hour. The data shown in the table below were obtained.
Annealing Temperature (°C) | Grain Size (μm) | Yield Strength (MPa) |
400 | 15 | 159 |
500 | 23 | 138 |
600 | 53 | 124 |
700 | 140 | 62 |
800 | 505 | 48 |
(a) Plot the yield strength and grain size as a function of annealing temperature on the same graph. Use two vertical axes, one for yield strength and one for grain size.
(b) For each temperature, state which stages of the annealing process occurred. Justify your answers by referring to features of the plot.
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