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5) Polycrystalline materials are stronger than their single crystal equivalent because: ] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained ] the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: ] Compressive strains 7) The resistance to slip is greater when impurity atoms are present: [ ] Tensile strains in the vicinity. [ ] because the lattice strain must increase if dislocation is torn away from them [] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ]Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: [ ]The modulus of elasticity of ceramics is higher than that of metal 1 The modulus of elasticity of metal is higher than that of ceranmics

5) Polycrystalline materials are stronger than their single crystal equivalent because: ] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained ] the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: ] Compressive strains 7) The resistance to slip is greater when impurity atoms are present: [ ] Tensile strains in the vicinity. [ ] because the lattice strain must increase if dislocation is torn away from them [] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ]Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: [ ]The modulus of elasticity of ceramics is higher than that of metal 1 The modulus of elasticity of metal is higher than that of ceranmics

Elements Of Electromagnetics
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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5) Polycrystalline materials are stronger than their single crystal equivalent because: [] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained I the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: [ ] Compressive strains [ ] Tensile strains in the vicinity. 7) The resistance to slip is greater when impurity atoms are present: [] because the lattice strain must increase if dislocation is torn away from them [ ] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ] Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: []The modulus of elasticity of ceramics is higher than that of metal []The modulus of elasticity of metal is higher than that of ceramics
Transcribed Image Text:5) Polycrystalline materials are stronger than their single crystal equivalent because: [] geometrical constraints are imposed on grains during deformation ] the mechanical integrity of the grains is not maintained I the shape of the grain it may assume that it is not affected by neighboring grains 6) A large substitutional atom imposes: [ ] Compressive strains [ ] Tensile strains in the vicinity. 7) The resistance to slip is greater when impurity atoms are present: [] because the lattice strain must increase if dislocation is torn away from them [ ] because the lattice strain must decrease if the dislocation is torn away 8) Increase amount of cold work: [ ] Increases the rate of re-crystallization [ ] Has no effect [ ] Decreases the rate of re-crystallization 9) Based on the atomic bonding: []The modulus of elasticity of ceramics is higher than that of metal []The modulus of elasticity of metal is higher than that of ceramics
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