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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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.
AUSTENITE (g iron) is a substitutional solid solution of carbon dissolved in iron with a face centered cubic structure Select one: True False
Two gage marks are placed exactly 250mm apart on a 12mm-diameter aluminum rod with E=73Gpa and an ultimate strength of 140Mpa. Knowing that the distance between the gage marks is 250.28mm after a load is applied, determine (a) the stress in the rod, (b) the factor of safety.
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…
In the present figure: compare between the alloy number 1 (0.4% C) and 2 (1.2% C) regarding: A. The expected mechanical properties of the two alloys (with explanation). B. The range of applications for these alloys. C. The stages of annealing treatments including: 1) Softening 2) Spheroidizing 3) Grain Size Reducing.. Subject: Metallurgy
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
Q 2 please
Composition lat% N 40 60 100 1600 2800 1500 1453 C 2600 Liquid 1400 Solidus line Liquidua line 2400 1300 1200 2200 1100 1085 C 2000 1000 20 40 100 Composition (wt N (NO What is the amount for each phase in 1kg of a 50% Ni-50% Cu alloy at temperatures of 1400, 1300, or 1200 degrees C for point A and point B? Temperature ('C) Temperature ("F)
(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
For each question, provide an explanation, identifying the correct choice ( it is marked in red) and explaining why it's the right answer, as well as why the other options are incorrect.

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