Interface Migration MCQ

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• Calculate the driving force at temperature 300K if the value of Xi (Concentration adjacent to the interface) and Xe (equilibrium concentration) are given as 4mols and 2mols respectively?
  ক

  300Rln3

  খ

  300Rln2

  গ

  150Rln2

  ঘ

  150Rln3
• Growth ledges are by no means restricted to solid/solid systems.
  ক

  True

  খ

  False
• If a single atom attaches itself to a flat close-packed interface it will raise the interfacial free energy.
  ক

  False

  খ

  True
• The accommodation factor (A) at the incoherent interfaces and diffuse solid/liquid interfaces can be close to________
  ক

  0

  খ

  1

  গ

  0.5

  ঘ

  6
• What happens to the driving force Δμ, when Xi (Concentration adjacent to the interface) approaches Xe (equilibrium concentration)? (For a dilute or ideal solution)
  ক

  Δμ=0

  খ

  Δμ>0

  গ

  Δμ<0

  ঘ

  Δμ cannot be predicted
• In the limit of a very low mobility it is possible that ____
  ক

  (∂C/∂x) interface = 0

  খ

  (∂C/∂x) interface > 0

  গ

  (∂C/∂x) interface < 0

  ঘ

  (∂C/∂x) interface = 1
• If we consider a β precipitate of an almost pure metal B with Interface mobility given as M, Molar volume V of the β phase, and the driving force is given as Δμ. Calculate the flux across the interface?
  ক

  J = MΔμ/V²

  খ

  J = -MΔμ/V

  গ

  J = -MΔμ/V²

  ঘ

  J = MΔμ/V
• Just for a simplicity consider a pure substance B. By analogy with the migration of a high-angle grain boundary the net flux of B across the interface will produce an interface velocity v given by____ (Interface mobility is given as M, Molar volume V, and the driving force is given as Δμ)
  ক

  MΔμ/V

  খ

  MΔμ +V

  গ

  M/Δμ*V

  ঘ

  MV/Δμ
• Martensitic transformations belongs to____
  ক

  Base transformation

  খ

  Civilian transformation

  গ

  Military transformation

  ঘ

  Mixed transformation
• During civilian transformations the parent and product will have _____ (Composition).
  ক

  Same composition

  খ

  Different composition

  গ

  Time dependent composition

  ঘ

  Nothing can be predicted
• Civilian transformation is a phenomenon that occurs when the uncoordinated transfer of atoms occurs across a____________
  ক

  Glissile interface

  খ

  Mixed interface

  গ

  Partially coherent interface

  ঘ

  Non-Glissile interface
• The migration of which among the following interfaces is extremely sensitive to temperature?
  ক

  Mixed

  খ

  Corrupted

  গ

  Glissile

  ঘ

  Non-Glissile
• Athermal migration is related to which of the following interface?
  ক

  Mixed

  খ

  Corrupted

  গ

  Non-Glissile

  ঘ

  Glissile
• Most of the transformation products are formed during the growth stage by the_____
  ক

  Transfer of atoms across the moving parent/product interface

  খ

  Movement of atoms in the formed nuclei

  গ

  Nucleation

  ঘ

  Random oscillation of parent particle
• In a way we can say that an interface is created during the____
  ক

  Nucleation

  খ

  Destruction

  গ

  Vibration

  ঘ

  Growth