Fermi level of an atom refers to the
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Metallurgical Engineering · all questionsPhysics of Metals in Metallurgy
Physics of Metals in Metallurgy
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A dislocation line in a fcc crystal dissociates into two partials which have their Burger vectors as and Indicate the correct statement.
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In a single crystal of copper (lattice parameter 3.615°A). The distance between (11) planes (in °A) is
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Match the following metals and alloys with their slip planes for room temperature deformations.
| P. Austenitic stainless steel | 1. None |
| Q. Molybednum | 2. (110) |
| R. Cadmium | 3. (111) |
| S. Tin | 4. (0001) |
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The respective units for dislocation density and stress intensity factor are
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In a cubic lattice, the direction [123] is contained in the
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Shear modulus of copper is 45 GPa. Lattice parameter of copper is 3.61°A. The magnitude of burgers vector in copper is . . . . . . . . °A.
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The direction [011] in cubic crystals
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For an FCC metal, the ratio of interplanar spacing obtained from the first two peaks of the X-ray diffraction pattern is
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Which of the following statements are true about edge dislocations?
P. Edge dislocations do not have an extra half plane associated with them.
Q. The Burger vectors is perpendicular to the direction.
R. Edge dislocations can avoid obstacles by cross-slip.
S. Depending on geometry, parallel edge dislocations of opposite signs can attract or repel one another.
P. Edge dislocations do not have an extra half plane associated with them.
Q. The Burger vectors is perpendicular to the direction.
R. Edge dislocations can avoid obstacles by cross-slip.
S. Depending on geometry, parallel edge dislocations of opposite signs can attract or repel one another.
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Which of the following is true for metals?
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If the drift velocity of holes under a field gradient of 150 V/m is 7.5 m/s, their mobility (in SI units) is
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In a powder diffraction photograph of copper (fcc structure with a lattice parameter of 0.3608 nm) taken with a cu-ka radiation (γ = 0.154 nm), the Bragg angle for the first line is
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The lowest angle reflection in a powder diffraction experiment or an fcc metal using Cu-Ka radiation (y = 1.54°A) occured at an angle of 19°30'. The lattice parameter of the metal is . . . . . . . . °A.
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Match the phenomenon with their specific effects on X-ray diffraction patterns
| P. Macroscopic residual stress | 1. Additional diffraction lines |
| Q. Microscopic residual stress | 2. X-ray line shift |
| R. Ordering reaction | 3. Debye rings of non-uniform intensity |
| S. Preferred orientation | 4. X-ray line broadening |
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The largest size of immobilised segment of dislocation in a Frank Read (FR) source contained in a polycrystalline material is of the order of grain size. In a metal of 10 μm grain size, the shear stress required to operate such a FR source is 100 MPa. If the grain size in the same metal is reduced to 10 μm, the shear stress required to operate such FR source would be . . . . . . . . MPa.
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The outer electron configurations of CO, Fe and Ni atoms are-respectively 3d74s2, and 3d2, 3d84s2. Which of the following ions has the potential to produce the highest magnetic moments?
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Silicon is doped with arsenic (concentration 1020 atoms.m-3). At room temperature, the electron and hole mobilities in Si are 0.14 m2.v-1.s-1 and 0.05 m2v-1.s-1 respectively. The conductivity in (Ωm)-1, at room temperature for Si doped with As is
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In an X-Ray powder pattern of a simple cubic crystal, the 2nd peak corresponds to
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At equilibrium spacing in a crystalline solid, which of the following is true for net interatomic force (F) and potential energy (U)?
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