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A dislocation formed by adding an extra half-plane of atoms to a crystal is referred to...
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....
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal?...
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
Word Bank for Problem 6 Edge Dislocation Tensile Strength Screw Dislocation Shear Strain Coordination # Shear...
Word Bank for Problem 6 Edge Dislocation Tensile Strength Screw Dislocation Shear Strain Coordination # Shear Stress Burgers Vector Elastic Modulus Elastic Plastic Deformation Deformation Strain Stress Crystal Anion 香 Planar density Unit Cell Linear Density substitutional Amorphous hardness vacancy interstitial Packing Factor Grain Boundary Lattice Constant Poisson's Ratio Galaga 6. (10 points) True or False a. Elastic Deformation is always recovered. Grain Boundaries weaken materials at room temperature. _The Hume-Rothery Rules predict solid solution alloying. % Hardness is a...
In a cubic crystal, a dislocation line of mixed character lies along the [112] direction. (i.e....
In a cubic crystal, a dislocation line of mixed character lies along the [112] direction. (i.e. ?⃗ = [112]). Burgers vector, ?⃗⃗ = 1/2 [110]. (a) What are the edge and screw components of the Burgers vector? (b) What is the slip plane?
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...
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),...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most con...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most concentration of atoms per unit area? Sometimes the number of atoms per unit area nsurface on the surface of a crystal is estimated by using the relation nsurface - nbulk2/3 where nbulk is the concentration of atoms in the bulk. Compare nsurface values with...
1. a) A simple cubic crystal is formed of atoms which interact with a Lennard-Jones potential...
1. a) A simple cubic crystal is formed of atoms which interact with a Lennard-Jones potential with a bond energy of 0.3 eV, and nearest neighbor distance -0.4 nm. Find A and B (note that r r is a minimum in U) b) What is the force between near est neighbors when rro? c) What is the force between nearest neighbors when r-1.01 ro? This is a small force, but on a VERY small object. d) What is the spring...
6. A single crystal, a. is made of grains with different crystallographic directions b. is formed as the result of...
6. A single crystal, a. is made of grains with different crystallographic directions b. is formed as the result of interlocking unit cells without any interruption c. does not show polymorphism d. has isotropic properties 7. By increasing the temperature from room temperature to the melting point of iron, the sequence of polymorphic transformations of iron is a FCC-BCC-HCP b. FCC-BCC-FCC c. BCC-FCC-BCC d. BCC-FCC-HCP 8. The Miller indices for the crystallographic plane shown are a. (123) b. (336) c....
Multiple Choice Section [Total = 10 Marks] Please circle the correct answer using a pen. There...
Multiple Choice Section [Total = 10 Marks] Please circle the correct answer using a pen. There is only one correct answer per question. 1. (2 Marks) Which of the following statements is false: a) Two edge dislocations of the same sign and lying on the same slip plane exert a repulsive force on each other. b) Edge dislocations of opposite sign and lying on the same slip plane exert an attractive force on each other. c) When two edge dislocations...
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....
3. (5 points) Which type of defect includes an additional half-plane of atoms within a crystal? a) Phase boundary b) Edge dislocation c) Screw dislocation d) Grain boundary 4. (5 points) A mixed dislocation is a type of a) Linear defect b) Interfacial defect c) Point defect d) Volume defect 5. (5 points) The figure shown below is an example of a a) Point defect b) Planar (i.e. two-dimensional) defect c) Linear defect d) Volumetric defect 6. (5 points) Grain...
Word Bank for Problem 6 Edge Dislocation Tensile Strength Screw Dislocation Shear Strain Coordination # Shear Stress Burgers Vector Elastic Modulus Elastic Plastic Deformation Deformation Strain Stress Crystal Anion 香 Planar density Unit Cell Linear Density substitutional Amorphous hardness vacancy interstitial Packing Factor Grain Boundary Lattice Constant Poisson's Ratio Galaga 6. (10 points) True or False a. Elastic Deformation is always recovered. Grain Boundaries weaken materials at room temperature. _The Hume-Rothery Rules predict solid solution alloying. % Hardness is 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...
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),...
Niobium (Nb) has the BCC crystal with a lattice parameter a 0.3294 nm. Find the planar concentrations as the number of atoms per nm2 of the (100), (110) and (111) planes. Which plane has the most concentration of atoms per unit area? Sometimes the number of atoms per unit area nsurface on the surface of a crystal is estimated by using the relation nsurface - nbulk2/3 where nbulk is the concentration of atoms in the bulk. Compare nsurface values with...
1. a) A simple cubic crystal is formed of atoms which interact with a Lennard-Jones potential with a bond energy of 0.3 eV, and nearest neighbor distance -0.4 nm. Find A and B (note that r r is a minimum in U) b) What is the force between near est neighbors when rro? c) What is the force between nearest neighbors when r-1.01 ro? This is a small force, but on a VERY small object. d) What is the spring...
6. A single crystal, a. is made of grains with different crystallographic directions b. is formed as the result of interlocking unit cells without any interruption c. does not show polymorphism d. has isotropic properties 7. By increasing the temperature from room temperature to the melting point of iron, the sequence of polymorphic transformations of iron is a FCC-BCC-HCP b. FCC-BCC-FCC c. BCC-FCC-BCC d. BCC-FCC-HCP 8. The Miller indices for the crystallographic plane shown are a. (123) b. (336) c....
Multiple Choice Section [Total = 10 Marks] Please circle the correct answer using a pen. There is only one correct answer per question. 1. (2 Marks) Which of the following statements is false: a) Two edge dislocations of the same sign and lying on the same slip plane exert a repulsive force on each other. b) Edge dislocations of opposite sign and lying on the same slip plane exert an attractive force on each other. c) When two edge dislocations...
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