Problem 9. The Cu-Ag system forms an eutectic phase diagram, as shown below. Onl

Question

Problem 9. The Cu-Ag system forms an eutectic phase diagram, as shown below. Only limited solubility of Ag in Cu and Cu in Ag exist at temperature below 779°C. Please list below the composition range(s) within which the Nordheim's Rule can be used to calculate material's resistivity as a function of the composition at 700°C The phase diagram of Cu-Ag is shown to the right. 1200 2200 Cu-Ag Eutectic Phase Diagram 1000 1600 779 C (T 800 1.9 91-2 1400 700 1200 1000 400 600 Ag Composition cwt% Ag) Answer: The composition range(s) within which the Nordheim's Rule can be used to calculate material's resistivity as a function of the composition at 700°C are #1, from 15 wt% Ag to S (wt %Ag #2, from-5 wt% Ag to as r% Ag #3, from- wt% Ag to %Ag Note: the applicable range(s) could be 1, 2 or 3, only use as many spaces as necessary

Explanation / Answer

Nordheim rule ,the resistivity of alloy is

p =p_+CX(1-X) p=alloy

Temperature=293 k

p=17.1 C=1100

1-from 0.6 wt% Ag to 1 wt % Ag

2-from 0.98 wt % Ag to 2.4 wt % Ag

3-from 1.3 wt % Ag to 2.67 wt % Ag

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