Material Properties Definitions

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  • Created by: Issy
  • Created on: 23-09-17 12:43

1. What statement about the structure of crystals is false?

  • Polycrystals are rare but large crystals are common
  • The structure is stable (repitition of a basic pattern)
  • Defects can occur such as vacancies and dislocations
  • Crystals are formed by solidification and the growth centres from which crystals grow compete for space
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2. What statement about dislocations is incorrect

  • A slip is plastic deformation from dislocations moving
  • Dislocations are mobile in ceramics
  • Dislocations are mobiloe in metals and make them ductile
  • Disloactions move towards grade boundaries
  • Dislocations are defects in the regular structure of a crystal or crystalline region of a material

3. What is a stiff material?

  • Plastically deforms without fracturing
  • Withstands an applied load without failure or plastic deformation
  • Resistant to stretching or bending
  • Easily shaped

4. What is plastic deformation?

  • Permanent deformation that occurs after excessive elastic deformation
  • A material deforming with little stress
  • Temporary deformation that occurs after excessive elastic deformation
  • The material will return to its original shape when the load is removed

5. What is brittle fracture?

  • Fracture of a material after plastic deformation
  • Fracture of a material without prior plastic deformation
  • Fracture of a material without prior elastic deformation
  • Fracture of a material after elastic deformation
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