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Callister - An introduction - 8th edition

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380 • Chapter 10 / Phase Transformations<br />

1<br />

4<br />

Austenite phase<br />

Austenite phase<br />

A s<br />

A f<br />

Cool down Heat up<br />

M s<br />

M f<br />

Temperature<br />

2<br />

3<br />

Martensite phase<br />

(heavily twinned)<br />

Deform<br />

Martensite phase<br />

(deformed)<br />

Figure 10.37 Diagram illustrating the shape-memory effect. The insets are schematic representations of the crystal structure<br />

at the four stages. M s and M f denote temperatures at which the martensitic transformation begins and ends. Likewise for the<br />

austenite transformation, A s and A f represent beginning and end transformation temperatures.

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