6. Describe each of the following crystal structure imperfections: a) substitutional atom; b)interstitial atom; c) vacancy.7. At equilibrium, what is the maximum amount of carbon that can dissolve in pure iron at600°C (by wt%). If the carbon content exceeds this maximum value, briefly describe themicrostructure of the resulting alloy.8. Give an example of a stress concentration in a metal part.9. How would you expect the mechanical properties of a metal with an FCC structure todiffer from one with a BCC structure? Why?10. What is a slip system and how is it different than a slip plane?

6. Crystal Structure Imperfectionsa) Substitutional Atom: This occurs when an atom in the crystal…

Answered: 6. Describe each of the following…

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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Solubility limit is the (1) concentration of solute that may be added (2) the formation of a new phase. (1) = minimum, (2) = without. (1) = maximum, (2) = with. (1) = maximum, (2) = without. (1) = minimum, (2) = with.
Q1 A/ Cu has F.C.C structure , lattice parametres of 0. 3615 nm, 83.7 kj / m³ is requried to produce avacncy, N, of 6.022 x 10 23 , K of 1.38 x10-23 j /K Determine : 1. number of atoms per m 2 .number of vacancies at 100 °C
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
Which of the following statements regarding the cubic dense stacking (CW) of metals is incorrect?A. Stacking type is A-B-A-B….B. One octahedral space falls per atom.C. Two tetrahedral spaces per atom.D. CSI's unit cell is YMK.E. The coordination number of metal is 12.
1. Figure 1 shows copper-nickel piping on a marine chemical tanker. As an inspection engineer, one day you were called to inspect a corrosion problem that occur on surface of the pipe. From microstructural investigation, you find out that the corrosion problem is caused by composition variation across the grain as shown in 2. Using phase diagram given, rationalise this microstructure. Your explanation should include why there are two shades of grey colour in the microstructure and what are their compositions? You are free to choose which ever copper-nickel system (example 80% Cu – 20% Ni) you like from the phase diagram. Figure 1 0% Ni 25% Ni 50% NI 75% Ni 100% N 1500 Liquid °C 1400 1330°C 1300 Liquidus jihe 1290°C 1200 LAS Soligus line 1100 400um Solid 1000L 100% Cu 75% Cu 25% Cu 50% Cu 0% Cu Figure 2 2. you have been introduced to one type of annealing heat-treatment, which is process-annealing also known as subcritical annealing. But there are a lot of other type annealing process…
Which of the following alloys would form a complete substitutional solid solution? O Metal 1 is HCP, metal 2 is FCC, and atomic radius difference is less than 15%. O Metal 1 is BCC, metal 2 is BCC, and atomic radius difference is at least 15%. O Metal 1 is FCC, metal 2 is FCC, and atomic radius difference is 12%. O Metal 1 is BCC, metal 2 is FCC, and atomic radius difference is 12%. O Metal 1 is FCC, metal 2 is FCC, and atomic radius difference is 15%.
Neat solution
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
A metal has a certain fraction f = 105 of vacancies at the atomic level at finite temperatures. If the activation energy for vacancy formation was increased by 50%, what would be the new vacancy concentration? Select one: a. 7.43E-10 b. 6.22 E-5 C. 1.24E-6 O d. 3.16E-8 e. 5.48E-4
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)
23/. Differentiate Substitutional and Interstitial solid solutions with a neat diagram.
(a) Describe with illustration, TWO (2) possible point defects that can occur in metal alloying elements. (b) Nickel and boron are to be diffused into an FCC iron metal during surface treatment. The diffusion process begins at the same time for both nickel and boron atoms. Identify with justification which metal atom diffused at a higher rate during the process. Table 2: Atom and crystal characteristic Atomic radius Crystal Structure Electronegativity Element Ni 0.1246 FCC +2 0.085 Rhombohedral +3 Fe 0.124 FCC +2 C 0.071 НСР +4

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