(a) Identify all eutectic and peritectic points in the diagram, specifying each
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Question
(a) Identify all eutectic and peritectic points in the diagram, specifying each point by composition and temperature.
(b) Consider an alloy of Ti with 20 wt.% Ni, slowly cooled from 1800C such that thermodynamic equlibrium is maintained for all temperatures. The alloy is kept at constant temperature once it reaches 800C.
i. At which temperature does the first solid phase form? [1]
ii. What is the composition of the first solid phase to form? [1]
iii. At what temperature does the alloy completely solidify? [1]
iv. What is the composition of the solid once it reaches 800C (Primary , eutectic and interme tallic phases, in wt.% Ni)? [3]
v. What is the weight fraction of each phase present? [3]
The Ti-Ni phase diagram is shown below. Answer the following questions based on the diagram. Weight Percent Nickel 100 10 20 30 40 50 BO 80 20 90 1800 1870°C 1600 1465°C 1400 1380°C 1310 C 1304 C 1200 1118 TiNi (Ni) 1000 984°C 942°C (STJ) 882°C 800 785°C (aTi) 630 C 600 20 40 60 90 100 10 30 70 Atomic Percent Nickel Ni TiExplanation / Answer
a. eutectic point
942 oC – 24% Ni
1118 oC – 61% Ni
1304 oC – 83% Ni
Peritectic points
984oC – 33% Ni
b. Nil
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