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Plastic Deformation Historical Background
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Plastic Deformation Historical Background

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Questions and Answers

What is the main mechanism of plastic deformation?

  • Linear crystalline defects
  • Breaking of inter atomic bonds
  • Motion of numerous dislocations (correct)
  • Sliding of atomic planes
  • What was the misconception in the 1900s regarding plastic deformation?

  • Motion of numerous dislocations
  • Sliding of atomic planes (correct)
  • Breaking of inter atomic bonds
  • Linear crystalline defects
  • What was the flaw in the 1930s theory regarding plastic deformation?

  • Breaking of inter atomic bonds
  • Sliding of atomic planes (correct)
  • Measurement of theoretical shear strength
  • Linear crystalline defects
  • How is plastic deformation mainly carried out through the lattice?

    <p>Motion of numerous dislocations</p> Signup and view all the answers

    What enabled the establishment of the existence of linear crystalline defects in the 1950s?

    <p>Electron microscopy</p> Signup and view all the answers

    What is the term used for the process of an edge dislocation slipping through the crystal lattice?

    <p>Dislocation slipping</p> Signup and view all the answers

    What is the significance of dislocations in materials with almost perfect crystal structure?

    <p>They enable plastic deformation by the movement of dislocations through the lattice</p> Signup and view all the answers

    What is the Burgers vector in the context of dislocations?

    <p>The direction and magnitude of distance the atoms move each unit step motion</p> Signup and view all the answers

    What does slip refer to in the context of materials?

    <p>The plastic deformation of a material by the movement of dislocations through the lattice</p> Signup and view all the answers

    What is dislocation density (rD) a measure of?

    <p>The length of dislocations per unit volume</p> Signup and view all the answers

    How does a dislocation choose its slip direction?

    <p>By moving in a direction that has the highest density of atoms</p> Signup and view all the answers

    What is a possible slip direction in an FCC unit cell?

    <p>$1/2 \sqrt{3}~a$</p> Signup and view all the answers

    How does a dislocation choose its slip plane?

    <p>By moving in close-packed planes that are easier to slip</p> Signup and view all the answers

    What is a possible slip plane in an FCC unit cell?

    <p>$(100)$</p> Signup and view all the answers

    What is a whisker in materials science?

    <p>A thin single crystal with a high degree of crystalline perfection and exceptional strength</p> Signup and view all the answers

    What would happen to an iron bar if dislocations were not present?

    <p>It would become weaker and more brittle</p> Signup and view all the answers

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