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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. A specific set of h






2. 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






3. 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






4. 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






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






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






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






8. New planes formed after the material has undergone slip






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






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






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






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






14. Large - artificially produced monocrystals






15. The distance between repeated planes in a lattice






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






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






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






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






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






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






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






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






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






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






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






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






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


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






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






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






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






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






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






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






36. 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






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






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






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






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






41. Materials whose order extends only to nearest neighbor atoms






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






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






44. 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






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






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






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






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






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






50. 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