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






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






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






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






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

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6. 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






7. The interaction of waves






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






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






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






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






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






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






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






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






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






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






18. 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






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






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






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






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






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






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. 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






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






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






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






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






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






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






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






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






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






35. New planes formed after the material has undergone slip






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






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






38. The distance between repeated planes in a lattice






39. The direction that dislocation moves in






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






41. 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






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






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






44. Crystallite materials with sizes of nanometers in length






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






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






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

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






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






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