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Flashcards

Materials Structure

Aki Re Engineering German 58 cards

Materials Structure

Cards in this deck (58)

  1. 1What are crystalline structures?manner atoms, ions or moleculs are arranged
  2. 2What is a lattice?describes a three-dimensional array of points coinciding with atom positions or spere centers.
  3. 3What is a Unit cell?unit cell is the basic structural unit or building block of the crystal structured
  4. 4Crystal structure for Aluminium, Chromium, Cobalt, Copper, Gold, -Iron, Nickel, Platinum, Silver, Titanium, Tungsten, ZincCrystal structure for Aluminium, Chromium, Cobalt, Copper, Gold, -Iron, Nickel, Platinum, Silver, Titanium, Tungsten, Zinc
  5. 5coordination number and atomic packing factor (APF)coordination number and atomic packing factor (APF)
  6. 6What are polymorphism and allotropy?more than one crystal strucutre is existent
    (=polymorphism). When this is found in elemental solids, this is oen termed allotropy. familiar example: carbon graphite and diamond
  7. 7What are lattice parameters?lattice parameters are:
    unit cell edges (a, b, c)
    unit cell angles (alpha, beta, gamma)
  8. 8Axial Relationship, Interaxial Angles and Unit Cell Geometry of Cubic and Hexagonal Crystal SystemsAxial Relationship, Interaxial Angles and Unit Cell Geometry of Cubic and Hexagonal Crystal Systems
  9. 9Axial Relationship, Interaxial Angles and Unit Cell Geometry of Tetragonal and Rhombohedral Crystal SystemsAxial Relationship, Interaxial Angles and Unit Cell Geometry of Tetragonal and Rhombohedral Crystal Systems
  10. 10Axial Relationship, Interaxial Angles and Unit Cell Geometry of Orthorhombic and Monoclinic Crystal SystemsAxial Relationship, Interaxial Angles and Unit Cell Geometry of Orthorhombic and Monoclinic Crystal Systems
  11. 11Axial Relationship, Interaxial Angles and Unit Cell Geometry of Triclinic Crystal SystemsAxial Relationship, Interaxial Angles and Unit Cell Geometry of Triclinic Crystal Systems
  12. 12Koordination of hexagonal crystals. How to convert from the three-index system to the four-index system?Koordination of hexagonal crystals. How to convert from the three-index system to the four-index system?
  13. 13Theoretical density computationTheoretical density computation
  14. 14Structure and length of Unit Cell of FCCStructure and length of Unit Cell of FCC
  15. 15Structure and length of Unit Cell of BCStructure and length of Unit Cell of BC
  16. 16What is Linear Density (LD) and Planar Density (PD)?What is Linear Density (LD) and Planar Density (PD)?
  17. 17What are grain, polycrystalline and grain boundaryWhat are grain, polycrystalline and grain boundary
  18. 18What is the diffraction phenomenon?What is the diffraction phenomenon?
  19. 19Interplanar separation for a plane having indices h, k, and l?Interplanar separation for a plane having indices h, k, and l?
  20. 20What is an single crystal?What is an single crystal?
  21. 21What is anisotropy and isotropy?What is anisotropy and isotropy?
  22. 22What describes Bragg’s law? Equation for Bragg’s law What happens if it is not satisfied?What describes Bragg’s law? Equation for Bragg’s law What happens if it is not satisfied?
  23. 23Define the terms noncrystalline and amorphousDefine the terms noncrystalline and amorphous
  24. 24Temperature dependence of the equilibrium number of vacanciesTemperature dependence of the equilibrium number of vacancies
  25. 25Difference between solute and solventDifference between solute and solvent
  26. 26Which features of the solute and solvent atoms determine the degree to which the former dissolves in ther latter?Which features of the solute and solvent atoms determine the degree to which the former dissolves in ther latter?
  27. 27How is the Burger’s vector showing for defects?Edge : Perpendicular to dislocation
    Screw: Parallel to dislocation
  28. 28What is a self-interstitial atom?A self-interstitial is an atom that goes into the voids of the main crystal structure.
  29. 29When do we speak of a solid solution?Solid solution forms when, a solute atoms are added to the host material and the crystal structre is maintained, and
    no new structure is formed
  30. 30What is an edge dislocation?Edge dislocation is a type of line defect in crystal lattices in which the defect occurs either due to the presence of an extra plane of atoms or due to the loss of a half of a plane of atoms in the middle of the lattice.
  31. 31What kind of interfacial defects exists?• External Surface
    • Grain Boundaries
    • Twin Boundaries
    • Miscellaneous Interfacial Defects
  32. 32Twin BoundariesA twin boundary is a special type of grain boundary across which there is a special mirror lattice symmetry
  33. 33Definition of Engineering stress Engineering strain Shear stressDefinition of Engineering stress Engineering strain Shear stress
  34. 34Relationship between shear stress and shear strain for elastic deformation Poisson’s ratio ν Range of Poisson’s ratio ν Relationship among elastic paramters (modulus of elasticity, shear modulus and Poisson’s ration) for isotropic materialsRelationship between shear stress and shear strain for elastic deformation Poisson’s ratio ν Range of Poisson’s ratio ν Relationship amon...
  35. 35What is resilience and how is it calculated? Modulus of resilience for linear elastic behavior, and incorporating Hooke’s lawWhat is resilience and how is it calculated? Modulus of resilience for linear elastic behavior, and incorporating Hooke’s law
  36. 36True stress and strain Definition of true stress and strain conversion of engineering stress to true stress and conversion of engineering strain to true strainTrue stress and strain Definition of true stress and strain conversion of engineering stress to true stress and conversion of engineering...
  37. 37When do we call a material brittle or ductile?When do we call a material brittle or ductile?
  38. 38What is toughness?ToIt is a measure of the ability of a material to absorb
    energy up to fracture.
    It is the area under the σ − є-curve up
    the the point of fracture.
  39. 39Hardness test What is hardness? Reasons for hardness tests?Hardness test What is hardness? Reasons for hardness tests?
  40. 40Hardness tests. Describe the following: Rockwell Hardness Tests Brinell Hardness Tests Knoop and Vickers Microindentation Hardness TestHardness tests. Describe the following: Rockwell Hardness Tests Brinell Hardness Tests Knoop and Vickers Microindentation Hardness Test
  41. 41What is design stress and how is it calculated? What is safe stress in this context?What is design stress and how is it calculated? What is safe stress in this context?
  42. 42Dislocations and Plastic Deformation What are the two fundamental dislocation types?Dislocations and Plastic Deformation What are the two fundamental dislocation types?
  43. 43Dislocations and Plastic Deformation What is lattice strain? What is dislocation annealing?Dislocations and Plastic Deformation What is lattice strain? What is dislocation annealing?
  44. 44Dislocations and Plastic Deformation slip in single crystals What is resolved shear stress? What is critical resolved shear stress? Which yield strength do we get?Dislocations and Plastic Deformation slip in single crystals What is resolved shear stress? What is critical resolved shear stress? Which...
  45. 45Dislocations and Plastic Deformation What is twinning and what is the difference between Slipping and Twinning? What is the consequence of twinning? When does is happen?Dislocations and Plastic Deformation What is twinning and what is the difference between Slipping and Twinning? What is the consequence o...
  46. 46Dislocations and Plastic Deformation What is dislocation density and how big is it in different kind of materials?Dislocations and Plastic Deformation What is dislocation density and how big is it in different kind of materials?
  47. 47Dislocations and Plastic Deformation What are slip, slip plane, slip direction, slip system?Dislocations and Plastic Deformation What are slip, slip plane, slip direction, slip system?
  48. 48Dislocations and Plastic Deformation Slip Systems for FCC, BCC, and HCP MetalsDislocations and Plastic Deformation Slip Systems for FCC, BCC, and HCP Metals
  49. 49Mechanism of Strengthening in Metals Which techniques exist?• Solid-Solution Strenghtening
    • Strain Hardening
    • Precipitation Hardening
    • Grain Size reduction
  50. 50Mechanisms of Strengthening in Metals GRAIN SIZE REDUCTION Reasons why grain boundaries act as barrier Dependence of Yield strength on grain sizeMechanisms of Strengthening in Metals GRAIN SIZE REDUCTION Reasons why grain boundaries act as barrier Dependence of Yield strength on gr...
  51. 51Mechanisms of Strengthening in Metals STRAIN HARDENING What is it and why is it strenghtening the material?Mechanisms of Strengthening in Metals STRAIN HARDENING What is it and why is it strenghtening the material?
  52. 52Recovery, Recrystallization and Grain Growth Describe Recrystallization What is recrystallization temperature? Which is it? When can it occur? Where is it fastest?Recovery, Recrystallization and Grain Growth Describe Recrystallization What is recrystallization temperature? Which is it? When can it o...
  53. 53Recovery, Recrystallization and Grain Growth Describe Tensile strength, dusctility, grain size over annealing temperatureRecovery, Recrystallization and Grain Growth Describe Tensile strength, dusctility, grain size over annealing temperature
  54. 54Mechanisms of Strengthening in Metals SOLID SOLN STRENGTHENING What is it and why is it strenghtening the material?Mechanisms of Strengthening in Metals SOLID SOLN STRENGTHENING What is it and why is it strenghtening the material?
  55. 55Recovery, Recrystallization and Grain Growth Describe RecoveryRecovery is a process by which deformed grains can reduce their stored energy by the removal or rearrangement of defects in their crystal structure. Defects or dislocations are anhillated.
  56. 56Recovery, Recrystallization and Grain Growth Describe Grain Growth Depende of grain size on timeRecovery, Recrystallization and Grain Growth Describe Grain Growth Depende of grain size on time
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Engineering Flashcards on Materials Structure, created by Aki Re on 18/01/2020.
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Aki Re
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