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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 numerical system used to represent specifics planes in a lattice






2. 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






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






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






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






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






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






8. New planes formed after the material has undergone slip






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






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






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






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






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






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






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






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






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






18. 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






19. Materials whose order extends only to nearest neighbor atoms






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






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

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






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

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






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






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






27. An electron microscope that passes the electron beam through the sample and used the difference in the beam scattering and diffraction to view the object






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






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






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






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






32. 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






33. The clustering of atoms around an impurity that provide a template 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 fourth level of structure in materials - describing how the microstructures fit together to form the material as a whole






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






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






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






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






41. A specific set of h






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






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






44. 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






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






46. Crystallite materials with sizes of nanometers in length






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






48. The distance between repeated planes in a lattice






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






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