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A Cu-Ni alloy must be fully liquid at 1350°C for processing. However, when placed in service the alloy must be solid at 1200°C. The phase diagram for the Cu-Ni binary system given below in Figure 3b. (i) Determine the composition range in which the alloy must lie. (ii) To obtain the maximum yield strength what composition should be used? (iii) If, however, the highest elongation is required then what composition should be used?

A Cu-Ni alloy must be fully liquid at 1350°C for processing. However, when placed in service the alloy must be solid at 1200°C. The phase diagram for the Cu-Ni binary system given below in Figure 3b. (i) Determine the composition range in which the alloy must lie. (ii) To obtain the maximum yield strength what composition should be used? (iii) If, however, the highest elongation is required then what composition should be used?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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A Cu-Ni alloy must be fully liquid at 1350°C for processing. However,
when placed in service the alloy must be solid at 1200°C. The phase
diagram for the Cu-Ni binary system given below in Figure 3b.
(i) Determine the composition range in which the alloy must lie.
(ii) To obtain the maximum yield strength what composition should
be used?
(iii) If, however, the highest elongation is required then what
composition should be used? 

Temperature (°C) Strength MPa 1500 1400 1300 1200 1100 1000 0 551 Cu 413 275 138 L Tensile strength Cu α Ni strengthens Cu a + L Yield strength % Elongation Cu strengthens Ni Ni 20 40 60 80 Weight percent nickel 80 60 40 20 Ni % Elongation Figure 3b. Cu-Ni phase diagram with corresponding property curves.
Transcribed Image Text:Temperature (°C) Strength MPa 1500 1400 1300 1200 1100 1000 0 551 Cu 413 275 138 L Tensile strength Cu α Ni strengthens Cu a + L Yield strength % Elongation Cu strengthens Ni Ni 20 40 60 80 Weight percent nickel 80 60 40 20 Ni % Elongation Figure 3b. Cu-Ni phase diagram with corresponding property curves.
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