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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. The ares of a material that separate different crystallite regions






2. Composed of both the slip plane and the slip directions






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






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






5. Generalized equation used to predict the temperature dependence of various physics properties






6. The distance between repeated planes in a lattice






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






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






9. 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






10. 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






11. Microscopes that focus a high- energy beam of electrons at the source and collect the back- scattered beam of these electrons






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






13. The movement of dislocations through a crystal - caused when the material is placed under shear stress






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






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






16. Lattice defects caused by the addition of a partial plane into an existing lattice structure






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






18. Large - artificially produced monocrystals






19. 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






20. The 14 distinct crystals structure into which atoms arrange themselves in materials






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

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22. A mathematical representation of the magnitude and direction of distortions in a lattice caused by dislocations






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






24. A point defect that occurs in ceramics when both a cation and an anion are missing from a lattice






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






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






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






28. Materials whose order extends only to nearest neighbor atoms






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






30. Homogeneous nucleation: grain boundaries: lattice/surface interactions:






31. Point defects that result when an atom in the lattice is replaced with an atom of a different element






32. Crystallite materials with sizes of nanometers in length






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






34. 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






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






36. A specific set of h






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






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






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






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






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






42. Formula that relates interplaner spacing in a lattice to constructive interference of diffracted X- rays

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43. The use of light to magnify objects up to 2000 times






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






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






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






47. The direction that dislocation moves in






48. 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






49. 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






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