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Modern Material Science And Engineering

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. The amount of the unit cell occupied by atoms as opposed to void space






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






3. 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






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






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






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






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


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






9. 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






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






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






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






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






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






15. 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






16. 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






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






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






19. 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






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






21. The distance between repeated planes in a lattice






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






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






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






25. Crystallite materials with sizes of nanometers in length






26. Materials whose order extends only to nearest neighbor atoms






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






28. 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






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






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






31. A specific set of h






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






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






34. 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






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


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






37. New planes formed after the material has undergone slip






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






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






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






41. The direction that dislocation moves in






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






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






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






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






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






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






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






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






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