Interphase Interfaces in Solids MCQ

Test your knowledge with important Interphase Interfaces in Solids MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Interphase Interfaces in Solids MCQs at Bissoy

• If the dislocation network (Burger and Interfacial) glides into the FCC crystal it results in a transformation of_____
  ক

  FCC->HCP

  খ

  HCP->FCC

  গ

  HCP->BCC

  ঘ

  BCC->HCP
• The formation of martensite in steel and other alloy systems occurs by the motion of_______
  ক

  Incoherent-dislocation interfaces

  খ

  Cropped-dislocation interfaces

  গ

  Mixed-dislocation interfaces

  ঘ

  Glissile-dislocation interfaces
• Under which circumstances does a glissile semi coherent interface gets formed?
  ক

  If the dislocations do not have a Burgers vector that can glide on matching planes in the adjacent lattices

  খ

  Depends on the extent of gliding

  গ

  When the orientation of the plane is unmatching

  ঘ

  If the dislocations have a Burgers vector that can glide on matching planes in the adjacent lattices
• Calculate the punching stress P, if the constrained misfit is given as 1/3 and the shear modulus of the matrix is given as 5Pa?
  ক

  5Pa

  খ

  3Pa

  গ

  2Pa

  ঘ

  7Pa
• What kind of misfit arises if the inclusion is the wrong size for the hole it is located?
  ক

  Volume misfit

  খ

  Lattice misfit

  গ

  Vertical misfit

  ঘ

  Lateral misfit
• If the precipitate and inclusion have different elastic moduli the elastic strain energy is no longer shape independent.
  ক

  False

  খ

  True
• If μ is the shear modulus of the matrix and V is the volume of the unconstrained hole in the matrix and the elastic energy does not depend on the shape of the precipitate, if so, calculate the elastic strain energy? (Assume the poissons ratio to be 1/3 and Misfit-Δ)
  ক

  ΔG=4μΔ2/V

  খ

  ΔG=4μ/Δ2*V

  গ

  ΔG=4μΔ2*V

  ঘ

  ΔG=4μΔ2 – V
• Which among the following are most unlikely to arise when a second-phase particle is located on a grain boundary?
  ক

  Precipitate can have incoherent interfaces with both grains

  খ

  Precipitate can have coherent or semi coherent interface with one grain and an incoherent interface with the other

  গ

  Precipitate can have a coherent or semi coherent interface with both grains.

  ঘ

  Nothing is predictable
• From an interfacial energy standpoint it is favourable for a precipitate to be surrounded by____
  ক

  High-energy coherent interfaces

  খ

  High-energy incoherent interfaces

  গ

  Low-energy incoherent interfaces

  ঘ

  Low-energy coherent interfaces
• Ag-rich zones in an AI-4 atomic % Ag alloy is an example of GP zone (Guinier and Preston).
  ক

  True

  খ

  False
• Fully coherent precipitate is also known as GP zone, GP stands for _______
  ক

  Gaff and Pearl

  খ

  Gas and Pressure

  গ

  Gatsby and Prince

  ঘ

  Guinier and Preston
• The interfacial energies of semi coherent interfaces are generally in the range of_______ (approximately)
  ক

  0-200 mJm-2

  খ

  200-500 mJm-2

  গ

  500-1000 mJm-2

  ঘ

  10000 mJm-2
• The degree of coherency can be greatly increased if_______
  ক

  Macroscopically irrational interface is formed

  খ

  Microscopically rational interface is formed

  গ

  Macroscopically rational interface is formed

  ঘ

  Microscopically irrational interface is formed
• Incoherent interface can also exist between crystals with an orientation relationship if the interface has a different structure in the two crystals.
  ক

  True

  খ

  False
• When the value of (Δ) misfit is greater than 0.25, the kind of interface is known as _________
  ক

  Coherent interface

  খ

  Mixed interface

  গ

  Semi coherent interface

  ঘ

  Incoherent interface
• For small values of misfit ∆, the structural contribution to the interfacial energy is approximately proportional to the____ (Semi coherent interface).
  ক

  Size and shape of dislocation

  খ

  Density of dislocation

  গ

  Texture

  ঘ

  Position of dislocation
• The interfacial energy of a semi coherent interface can be approximately considered as the sum of two parts. What are they?
  ক

  Chemical and structural contribution

  খ

  Chemical and bulk contribution

  গ

  Magnetic contribution and structural

  ঘ

  Physical and bulk contribution
• A spacing ‘’D’’ can be used to completely accommodate the lattice misfit in the one direction without any long-range strain field by a set of edge location. Calculate the value of D if the interplanar spacing’s of matching planes are given as 20mm, 19mm respectively? (Assume the misfit to be very small)
  ক

  390mm

  খ

  240mm

  গ

  795mm

  ঘ

  800mm
• Assume that 5mm and 5mm are the unstressed interplanar spacing’s of matching planes in the α and ß phases respectively, the disregistry, or misfit between the two lattices (∆) is defined by__
  ক

  0

  খ

  0.5

  গ

  1

  ঘ

  2
• In a semi coherent interface, the disregistry is periodically taken up by _________
  ক

  Coarsened structure

  খ

  Proper fit

  গ

  Misfit dislocations

  ঘ

  Cross dislocation
• In which among the following case there is only one plane that can form a coherent interface?
  ক

  Simple cubic

  খ

  BCC

  গ

  Edge centered lattice

  ঘ

  HCP
• The resultant lattice distortion to maintain the coherency is known as__
  ক

  Strain rupture

  খ

  Coherency strain

  গ

  Rupture plane

  ঘ

  Maintenance plane
• Within the bulk of each phase every atom has an optimum arrangement of nearest neighbours that produces a low energy. At the interface, however, there is usually a change in composition so that each atom is partly bonded to wrong neighbours across the interface.
  ক

  True

  খ

  False
• HCP silicon-rich k phase and the FCC copper-rich α-matrix in Cu-Si alloys forms ___
  ক

  A coherent interface

  খ

  An incoherent interface

  গ

  Mixed interface

  ঘ

  A semi coherent interface