Homework Answers
Ans 3 : b) edge dislocation
There are basically two types of three dimensional dislocations : edge and screw. The edge dislocations that have burgers vector perpendicular to the dislocation line are simpler to visualize as they have an additional half plane of atoms within the crystal. They are also called as line defects. The screw dislocations are a little complex as they have the burgers vector parallel to the dislocation line.
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3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal?...
A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to...
A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to as a (an) Screw dislocation Vacancy dislocation Interstitial dislocation Edge dislocation
2. 10 Points Match the terms in Column B with Column A (1 mark each =...
2. 10 Points Match the terms in Column B with Column A (1 mark each = 12) NOT ALL of COLUMN B IS MATCHED with COLUMN A MATCHING COLUMN A COLUMN B NUMBER a. {100} 1. Family of directions b. Cu on Ni lattice site 2. Family of planes C. Stacking sequence of FCC 3. Energy required for fracture d. Electron sharing 4. АВСАВСАВС e. Carbon in iron 5. Covalent bonding f. Microscope with atomic resolution 6. Above 0.4Tm g....
A single crystal in the form of a cube has two possible slip planes. (1) and...
A single crystal in the form of a cube has two possible slip planes. (1) and (2). as shown in the sketch below. Each of these planes has two possible slip directions, (a) and (b), as is also shown. The angle between the tensile load axis and slip plane normal for both slip planes is 450 40 <plane (1)> <plane (2)> a) If a stress is applied to this crystal in the direction noted, specify which particular (eg. plane (1),...
number 17,18,19,20 material science 17. Pl astically deforming a metal specimen near room temperature generally leads...
number 17,18,19,20
material science
17. Pl astically deforming a metal specimen near room temperature generally leads to which of the following property changes? a. A decreased yielding strength and an increased ductility b. An increased yielding strength and an increased ductility c. A decreased yielding strength and a decreased ductility d. An increased yielding strength and a decreased ductility 18. A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to as a (an) a....
Materials/Edge Dislocation Problem: 3. Problem 3: (40 points An edge dislocation given by burgers vector, 01]...
Materials/Edge Dislocation Problem:
3. Problem 3: (40 points An edge dislocation given by burgers vector, 01] on the (111) plane in an fcc crystal dissociates into two partial dislocations a) Provide the dislocation reaction for the above. Vectorially depict the three dislocations on a (111) plane b) Prove that the reaction is thermodynamically feasible c) The two partial dislocations can each be split into horizontal and vertical components. Each of the components are either, pure screw or edge dislocations. These...
16) An atom with a valence structure of 1s 2el 2nf 3ed 3pf 4e 3d would...
16) An atom with a valence structure of 1s 2el 2nf 3ed 3pf 4e 3d would behave most like a) Transition metal b) Alkal d Alkaline earth Part C) Multiple Choice (30 points, 3 pts each) d) Inert element e) Actinide n Isotropic 17) What statement below is true when comparing ideal HCP and FCC structures? al Elements with both are very ductile b) Atoms touch along the [100) directions c FCC metals have lower den d) None of the...
A linear antenna array comprises 5 half-wave dipoles arranged parallel to each other, lying in a plane and spaced \/2 apart. If the dipoles are fed 'in phase" (a) Write the expression for the...
A linear antenna array comprises 5 half-wave dipoles arranged parallel to each other, lying in a plane and spaced \/2 apart. If the dipoles are fed 'in phase" (a) Write the expression for the normalised field pattern of the array (b) Plot, with aid of a computer, the field pattern in (a) (c) Calculate the angular width of the main beam at the half-power points and between the first nulls.
A linear antenna array comprises 5 half-wave dipoles arranged parallel...
% 5.4.29 :3 Question Help Find the critical points and solve the related phase plane differential...
% 5.4.29 :3 Question Help Find the critical points and solve the related phase plane differential equation for the system below. df = (x – 4)(y-4) d = y(y-4) Describe (without using computer software) the asymptotic behavior of trajectories (as t → 00) that start at (a) (5,5), (b) (7.5),(6)(-7.5),(a) (-5,-5). choice. A. The critical points lie along the line(s) y=4 and also occur at the point(s) (4,0). (Type an equation. Type an ordered pair. Use a comma to separate...
(10 points each) Given the following unity feedback system 3. E(s) R(s) C(s) 080-00 Figure 3 Where Go) DXG+3%6+5) 2(s +2) Find stability, and how many poles are in the right half-plane, in the le...
(10 points each) Given the following unity feedback system 3. E(s) R(s) C(s) 080-00 Figure 3 Where Go) DXG+3%6+5) 2(s +2) Find stability, and how many poles are in the right half-plane, in the left half-plane, on the jw axis. a. b. Draw the root locus for the system indicating the breakaway points, the ju crossings Draw the corresponding asymptotes on the diagram, calculate number of asymptotes, center and angle of asymptotes. c.
(10 points each) Given the following unity...
3. (2 points) The best way to describe the voltage transfer characteristic of a rectifier half-wave...
3. (2 points) The best way to describe the voltage transfer characteristic of a rectifier half-wave diode (not ideal) is to say that approximately (neglecting the avalanche region) #0 Three linear segments b) Two Inear segments c) Two linear segments whose slopes are: 0 and greater than 1, respectively. d) 3 line segments whose slopes are: less than-1, 0 and greater than 1 e) Two linear segments whose slopes are: 0, and less than 1, respectively Two linear segments whose...
A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to as a (an) Screw dislocation Vacancy dislocation Interstitial dislocation Edge dislocation
2. 10 Points Match the terms in Column B with Column A (1 mark each = 12) NOT ALL of COLUMN B IS MATCHED with COLUMN A MATCHING COLUMN A COLUMN B NUMBER a. {100} 1. Family of directions b. Cu on Ni lattice site 2. Family of planes C. Stacking sequence of FCC 3. Energy required for fracture d. Electron sharing 4. АВСАВСАВС e. Carbon in iron 5. Covalent bonding f. Microscope with atomic resolution 6. Above 0.4Tm g....
A single crystal in the form of a cube has two possible slip planes. (1) and (2). as shown in the sketch below. Each of these planes has two possible slip directions, (a) and (b), as is also shown. The angle between the tensile load axis and slip plane normal for both slip planes is 450 40 <plane (1)> <plane (2)> a) If a stress is applied to this crystal in the direction noted, specify which particular (eg. plane (1),...
number 17,18,19,20
material science
17. Pl astically deforming a metal specimen near room temperature generally leads to which of the following property changes? a. A decreased yielding strength and an increased ductility b. An increased yielding strength and an increased ductility c. A decreased yielding strength and a decreased ductility d. An increased yielding strength and a decreased ductility 18. A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to as a (an) a....
Materials/Edge Dislocation Problem:
3. Problem 3: (40 points An edge dislocation given by burgers vector, 01] on the (111) plane in an fcc crystal dissociates into two partial dislocations a) Provide the dislocation reaction for the above. Vectorially depict the three dislocations on a (111) plane b) Prove that the reaction is thermodynamically feasible c) The two partial dislocations can each be split into horizontal and vertical components. Each of the components are either, pure screw or edge dislocations. These...
16) An atom with a valence structure of 1s 2el 2nf 3ed 3pf 4e 3d would behave most like a) Transition metal b) Alkal d Alkaline earth Part C) Multiple Choice (30 points, 3 pts each) d) Inert element e) Actinide n Isotropic 17) What statement below is true when comparing ideal HCP and FCC structures? al Elements with both are very ductile b) Atoms touch along the [100) directions c FCC metals have lower den d) None of the...
A linear antenna array comprises 5 half-wave dipoles arranged parallel to each other, lying in a plane and spaced \/2 apart. If the dipoles are fed 'in phase" (a) Write the expression for the normalised field pattern of the array (b) Plot, with aid of a computer, the field pattern in (a) (c) Calculate the angular width of the main beam at the half-power points and between the first nulls.
A linear antenna array comprises 5 half-wave dipoles arranged parallel...
% 5.4.29 :3 Question Help Find the critical points and solve the related phase plane differential equation for the system below. df = (x – 4)(y-4) d = y(y-4) Describe (without using computer software) the asymptotic behavior of trajectories (as t → 00) that start at (a) (5,5), (b) (7.5),(6)(-7.5),(a) (-5,-5). choice. A. The critical points lie along the line(s) y=4 and also occur at the point(s) (4,0). (Type an equation. Type an ordered pair. Use a comma to separate...
(10 points each) Given the following unity feedback system 3. E(s) R(s) C(s) 080-00 Figure 3 Where Go) DXG+3%6+5) 2(s +2) Find stability, and how many poles are in the right half-plane, in the left half-plane, on the jw axis. a. b. Draw the root locus for the system indicating the breakaway points, the ju crossings Draw the corresponding asymptotes on the diagram, calculate number of asymptotes, center and angle of asymptotes. c.
(10 points each) Given the following unity...
3. (2 points) The best way to describe the voltage transfer characteristic of a rectifier half-wave diode (not ideal) is to say that approximately (neglecting the avalanche region) #0 Three linear segments b) Two Inear segments c) Two linear segments whose slopes are: 0 and greater than 1, respectively. d) 3 line segments whose slopes are: less than-1, 0 and greater than 1 e) Two linear segments whose slopes are: 0, and less than 1, respectively Two linear segments whose...
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