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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 first level of the structure of materials - describing the atoms present






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






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






5. The interaction of waves






6. 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






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






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






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






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






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






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






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






14. 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






15. Crystallite materials with sizes of nanometers in length






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






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






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






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






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






21. 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






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






23. The distance between repeated planes in a lattice






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






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






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






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






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






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






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






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






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






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






34. A specific set of h






35. New planes formed after the material has undergone slip






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. 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






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






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






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






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






42. Materials whose order extends only to nearest neighbor atoms






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






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






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






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






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






48. The direction that dislocation moves in






49. 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






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