section%206.2%20-%20Binary%20Phase%20Diagrams

section%206.2%20-%20Binary%20Phase%20Diagrams - 6.2 Bina ry...

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6.2 Binary Phase Diagrams Objectives From a phase diagram, determine phases present, phase compositions, phase amounts. As we saw in the previous section, a phase diagram is a map of the phases present as a function of composition and temperature. Phase diagrams are named by how many components they have, so a binary phase diagram is a phase diagram that has two components. For metallic phase diagrams, solid phases are usually named with Greek letters. So for example, a solid solution of two metals might be called the α phase. Figure 6.2.1 shows the binary phase diagram for copper and nickel. This is the simplest type of phase diagram, in which there is complete solubility of the two components in each other for all compositions; in other words, at low temperatures there is always only one phase, no matter what the composition. We will use this phase diagram to start learning about how to get information off of phase diagrams. Figure 6.2.1: Binary phase diagram for copper and nickel. GI 6.2.1 What components are present for phase diagram In Figure 6.2.1?
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GI 6.2.2 For a mixture of 20 wt% Ni and 80 wt% Cu at 1300 C, what phases are present? ˚ GI 6.2.3 For a mixture of 50 wt% Ni and 50 wt% Cu at 1300 C, what phases are present? ˚ GI 6.2.4 For a mixture of 80 wt% Ni and 20 wt% Cu at 1300 C, what phases are present? ˚ GI 6.2.5 For each of the situations in GI 6.2.2-6.2.4, identify the amount of the phases present if you can. If you can not, explain why. GI 6.2.6 For each of the situations in questions 2-4, identify the compositions of the phases present if you can. If you can not, explain why.
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Concept Check What are the phase compositions for 20 wt% Ni and 80 wt% Cu at 1300° C?
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