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Callister - An introduction - 8th edition

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288 • Chapter 9 / Phase Diagrams<br />

Figure 9.3 (a) The<br />

copper–nickel phase<br />

diagram. (b) A<br />

portion of the<br />

copper–nickel phase<br />

diagram for which<br />

compositions and<br />

phase amounts are<br />

determined at point<br />

B. (Adapted from<br />

Phase Diagrams of<br />

Binary Nickel Alloys,<br />

P. Nash, Editor, 1991.<br />

Reprinted by<br />

permission of ASM<br />

International,<br />

Materials Park, OH.)<br />

Temperature (°C)<br />

Composition (at% Ni)<br />

0 20 40 60 80 100<br />

1600<br />

2800<br />

1500<br />

Liquid<br />

1453°C<br />

2600<br />

1400<br />

Liquidus line<br />

Solidus line<br />

2400<br />

1300<br />

+ L<br />

B<br />

1200<br />

2200<br />

<br />

Temperature (°F)<br />

1100<br />

1085°C<br />

A<br />

2000<br />

1000<br />

0<br />

20<br />

40<br />

60<br />

80<br />

100<br />

(Cu)<br />

Composition (wt% Ni)<br />

(a)<br />

(Ni)<br />

1300<br />

Liquid<br />

Temperature (°C)<br />

1200<br />

Tie line<br />

+ Liquid<br />

R<br />

B<br />

+ Liquid<br />

S<br />

<br />

<br />

20 30<br />

40 50<br />

C L C 0 C <br />

Composition (wt% Ni)<br />

(b)<br />

ranges from 0 wt% Ni (100 wt% Cu) on the left horizontal extremity to 100 wt%<br />

Ni (0 wt% Cu) on the right. Three different phase regions, or fields, appear on the<br />

diagram, an alpha () field, a liquid (L) field, and a two-phase L field. Each<br />

region is defined by the phase or phases that exist over the range of temperatures<br />

and compositions delineated by the phase boundary lines.

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