(a) What is the difference between the states of phase equilibrium and metastability?(b) Explain with the aid of neatly drawn binary phase diagrams the following terms?i. Isormophous phase diagramii. Eutectic Isothermiii. Peritectic point(c) in the Cu and Ag phase diagram shown in Figure 1.1, consider an alloy composition of 40 wt%Cu - 60 wt% Ag.Composton t RND120020GO8010022002000LIQUOLS1000Lquto:000...:6008.0:400912:200G00Somus:000B00400G00200400100204060Composition wes ADFigure 1.1: Cu - Ag Phase Diagrami.What Phases are present in the Alloy at 800° C?i.What are the compositions of present phases if the alloy is cooled by 20° C?iii.What are the mass fraction of phases?If the alloy was further cooled by 2° C, determine the volume fraction of the phases? Take thedensities of Cu and Ag as 8.96 and 10.49 g/cm' respectively.iv.

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Determine the composition of the phases;
Temperature ("C) Temperature ($1 Consider 1 kg of Copper - Silver alloy (Cu - Ag) containing 75 wt% Ag. The phase diagram of the alloy is shown in the figure below. The alloy is cooled to 778 °C (just below the eutectic temperature). Calculate the mass in kg of the eutectic phase B (phase B that appears during the eutectic reaction) that forms? Composition (at% Ag 20 40 60 100 2200 80 1200 2000 Liquidus 1000 LIquid 1800 Solidus 1600 800 779°C (T 80 91.2 1400 IC. 1200 600 Solvus T000 400 800 200 20 40 80 100 (Cu) Composioon wt A
Describe the different phases in the Fe-Fe-C diagram?
An alloy system consists of two metals A&B which are soluble in each other in all proportions in the liquid state, but completely insoluble in the solid state. The melting point of metal A is 425°C and B is 375°C. The lowest melting point (Eutectic) is 230°C at 40%B. Choose the correct answers for the following sentences: the phases present in the equilibrium diagram are: OL& A & B O A & B O A&L B& L
Figure 2 refers to the phase diagram for silver and tin. Label the regions (1) to (5) Temperature, 0/°C 1000 800 600 400 200 0 Liquid 2 Ag,Sn 60 a 20 40 80 Mass percentage Ag/% 100 Question 6: What will be observed when liquids of composition of 40% Ag are cooled to 200 K? When will it begin to precipitate? When will it become solid?
An alloy consisting of completely soluble cadmium (Cd) and zinc (Zn) in the liquid state, but neither of them dissolves in each other in the solid state. the table shown below shows the solidification temperatures for various alloys of cadmium and zinc. 1. Draw the equilibrium diagram according to the information given and data in the table and indicating all important temperature and phases. 2. Find the percentage of each phases and percentage of constituents of the alloy that contain 60 % Zn and at a temperature 300 °C. 3. Find the melting point for the following alloys 20 % Cd, 80% Cd 4. Draw the internal structure, noting the phases of the following alloys A) 30 % Cd at 290 °C b) 60 % Cd at room temperature. % of Zinc in alloy Start of solidification ("C) End of solidification ("C) 0 10 14 20 30 40 50 60 321 290 266 275 293 310 328 345 70 80 90 100 362 390 401 419 266 266 266 266 266 266 266 266 266 266 266 266
Do it in your handwriting
Is it possible to have a copper-nickel alloy that, at equilibrium, consists of a liquid phase of composition 20 wt% Ni-80 wt% Cu and also an a phase of composition 37 wt% Ni-63 wt% Cu? If so, what will be the approximate temperature of the alloy? If this is not possible, explain why. Temperature (°C) 1600 1500 1400 1300 1200 1100 1000 0 1085°C (Cu) 20 Liquid Liquidus line L B 40 a+L a A 60 Composition (wt% Ni) (a) 1455°C Solidus line 80 2800 2600 2400 2200 2000 100 (Ni) Temperature (°F) Temperature (°C) 1300 1200 20 Liquid Tie line. a + Liquid a 1 KR I 1 1 B ↑ Co a + Liquid -S 30 CL Composition (wt% Ni) (b) 40 1 Ca a 50
Q.4) For 30 wt% Sn - 70 wr% Pb alloy at 125 °C, (a) what phases are present? (b) What are the compositions of the phases? (c) Calculate the relative mass fraction of each phase present. Composition (at% Br 100 80 60 40 20 A 3270 Temperature (C) 300 200 100 0 0. (Pb) Solvus Solidu a+L B 18.3 20 liquidus Liquid 183 C 61.9 40 60 Composition (wt% Sn) 80 L 232 C G 97.8 1 600 500 P 400 (3) angesadway 300 200 H 100 100 (Sn)
700 L 600 M a + L Mg, Pb 500 P 465 400 L Mg Pb 300 200 a + Mg Pb B+ Mg Pb 100 20 40 60 80 100 Mg Composition (wt% Pb) Pb Mg,Pb Using the above figure, sketch neatly the microstructure of the alloys (given in the below table) and determine the amount of each phase presented. Structure of the alloys at different compositions 田 Compositions &temperature 10%Pb,90%Mg Structure Structure Compositions &temperature 20%Pb, 80%Mg @400°C @0°C My.Pb 50%Pb,50%Mg 67%Pb, 33%Mg @0°C Mgz PB @0°C 81%Pb,19%Mg 90%Pb,10%Mg @200°C @0°C Temperature ("C)
Q4.Plot equilibrium thermal diagram of Ni-Cu binary alloy complete solubility phase diagram.
Consider 2.0 kg of austenite containing 0.5 wt% C and cooled to just below 727°C (1341°F). (a) What is the proeutectoid phase? (b) How many kilograms each of pearlite, the proeutectoid phase, and cementite form?

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