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Modern Material Science And Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A mathematical representation of the magnitude and direction of distortions in a lattice caused by dislocations






2. The distance between repeated planes in a lattice






3. A nullification caused by two waves interacting out of phase






4. The presence of both screw and edge dislocations separated by a distance in the same lattice






5. The first level of the structure of materials - describing the atoms present






6. New planes formed after the material has undergone slip






7. A numerical quantity developed by the American Society for Testing and Materials (ASTM) to characterize grain sizes in materials






8. The clustering of atoms around an impurity that provide a template for crystal growth






9. The direction that dislocation moves in






10. Tiny clusters of arranged atoms that serve as the frameworks for subsequent crystal growth






11. The second step in the formation of crystallites - which is dependent on temperature and can be described using the arrhenius equation






12. The process of forming small aligned clusters of atoms that serve as the framework for crystal growth






13. Most common of the non - cubic bravais lattices; having six atoms forming a hexagon on both the top and bottom and a single atom positioned in the center - between the two hexagonal rings






14. A numerical system used to represent specifics planes in a lattice






15. The edge lengths and angels of a unit cell; describes the sizes and shapes of the lattices






16. The fourth level of structure in materials - describing how the microstructures fit together to form the material as a whole






17. A bravais lattice that has one atom in each of the 8 corners of the unit cell; less common than the other two cubic forms






18. The equations used to determine the critical resolved shear stress in a material

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19. Regions of a material in which atoms are arranged in a regular pattern






20. The interaction of waves






21. Mechanism by which dislocations move in directions that are perpendicular to the slip plane






22. The filling of a vancacy in the partial plane of an edge dislocation by an adjacent atom resulting in a shrinking of the crystal in the direction perpendicular to the partial plane






23. Correlation used to estimate the yield strength of a given material - based on grain size






24. The ares of a material that separate different crystallite regions






25. The increase in amplitude resulting from two or more waves interacting in phase






26. A flaw in the structure of a material that occurs at a single site in the lattice - such as vacancies - substitutions - and interstitial defects






27. One of the bravais lattice that contains one atom in each corner of the unit cell as well as one atom in the center of the unit cell






28. The lowest stress level at which a slip will begin in the material






29. The third level of structure in materials - describing the sequencing of crystals at a level invisible to the human eye






30. The line extending along the extra partial plane of atoms in an edge dislocation






31. The amount of the unit cell occupied by atoms as opposed to void space






32. The size - shape - and arrangement of atoms in a three- dimensional lattice






33. One of the bravais lattices that has one atom in each of the 8 corners of the unit cell and one atom on each face of the unit cell






34. A point defect found in ceramic materials that occurs when a cation diffuses onto an interstitial site on the lattice






35. The first set of panes in a material to experience slip under an applied stress






36. Large - artificially produced monocrystals






37. The smallest subdivision of a lattice that still contains the characteristics of that lattice






38. A standard used to measure the spread in the peak of a diffractogram - measures at the intensity value corresponding to the half highest value in the peak






39. Point defects that occur when an atom occupies a space that is normally vacant






40. For a slip to occur - a sufficient amount of stress must be applied to permanently deform the material






41. Crystallite materials with sizes of nanometers in length






42. Provides a framework for the new atoms to follow in constructing a monocrystal






43. The systematic reduction in intensity of diffraction peaks from specific lattice planes






44. A means of relating the amount of spreading in a X- ray diffractogram to the thickness of the crystallites in the sample






45. Lattice defect that occurs when the lattice is cut and shifted by a row of atomic spacing






46. A specific set of h






47. Large scale lattice defects that occur from alterations to the structure of the lattice itself






48. Materials in which the entire structure is a single unbroken grain






49. The second level of the structure of materials - describing how the atoms are positioned in relation to one another as well and the type of bonding between them






50. Clustering that occurs when a pure material cools sufficiently to self- support the formation of stable nuclei