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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.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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






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






3. The direction that dislocation moves in






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






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






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






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






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






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






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






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






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






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






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






15. 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






16. 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






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






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






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






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






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


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






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






24. 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






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






26. New planes formed after the material has undergone slip






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






28. 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






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


30. The density a material would have if it consisted of a single perfect lattice






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






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






33. The interaction of waves






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






35. Point defects that result from the absence of an atom at a particular site






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






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






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






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






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






41. Materials whose order extends only to nearest neighbor atoms






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






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






44. 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






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






46. 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






47. A hypothetical structure accounting for irregularities in the boundaries between crystallites






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






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






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