The grain size of pure copper after annealing for 103S is 10 μm. If the time exponent is 0.5, the total time of annealing required to obtain a grain size of 40 μm is . . . . . . . . S.
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Metallurgical Engineering · all questionsPhysics of Metals in Metallurgy
Physics of Metals in Metallurgy
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For dislocation with Burger vector b, the energy is
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A unit cell of an element has maximum linear density along the [110] direction. The packing density of its (100) plane is
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Saturation magnetization of an FCC metal with lattic parameter 0.2 nm is 600 kA/m. The net magnetic moment per atom is given by (in Bohr magnetron)
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Which one of the following signals from a specimen is used in a scanning electron microscope to get quantitative elemental analysis?
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An electron beam is accelarated by a potential and the velocity of electrons in the beam is 1.8754 × 108 m. s-1. The accelarting potential in kilovolts is
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At room temperature F.C.C. crystal structure is observed in
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The planer density for (111) plane in a fcc crystal is
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If the carrier charge concentration (n) and mobility (μa) in a metallic conductor are respectively
1.602 × 10-19C, 8.50 × 10-3 m2. V-1 S-1, the resistivity of the material in [Ω m] is
1.602 × 10-19C, 8.50 × 10-3 m2. V-1 S-1, the resistivity of the material in [Ω m] is
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The miller indices of the direction common to the planes (111) and (110) in a cubic system is
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The Fe. Al intermetallic phase has a disordered bcc structure at high temperatures. This first four Bragg reflections will be
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An elliptical dislocation loop is gliding on plane ABCD of a single crystal of BCC material as shown in the following figure. It is gliding along the burger vector 'b'. Identify the correct statement.
P. Plane ABCD belongs to the family of (110).
Q. Burger vector 'b' belong to <110> direction.
R. Dislocation has the edge character at point x and the screw character at point z.
S. Dislocation has the screw character at point x
P. Plane ABCD belongs to the family of (110).
Q. Burger vector 'b' belong to <110> direction.
R. Dislocation has the edge character at point x and the screw character at point z.
S. Dislocation has the screw character at point x
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Match the planes in Group 1 with the interplaner spacings in Group 2 for a cubic crystal having a lattice parameter of 'α'.
| Group 1 | Group 2 |
| P. (100) | 1. |
| Q. (110) | 2. |
| R. (111) | 3. |
| S. (210) | 4. α |
| 5. | |
| 6. |
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Match the energy gaps in Group II with the materials in Group I.
| Group I | Group II |
| P. Diamond | 1. 0.1 eV |
| Q. Silicon | 2. 0.7 eV |
| R. Grey tin | 3. 1.1 eV |
| 4. 6.0 eV |
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In an FCC crystal, the strain energy per unit length of a dislocation with Burgers vector <110> is . . . . . . . . times that of a <112> dislocation.
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In a hcp single crystal, slip on the basal plane may occur; if the tensile axis is along
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The elastic strain in copper is due to
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The atomic packing factor the diamond cubic structure is
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For a cubic metal with lattice parameter of 3.92°A, the first four diffraction peaks from the X-ray powder diffraction pattern taken with Cu-Ka radiation (λ = 1.5405°A) occur at 2θ values of 39.7, 46.2, 67.5 and 81.3 degrees. The crystal structure of the metal is
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In a conventional unit cell of a crystal a = b ≠ c and a = β = γ = 90°. This crystal belongs to which of the followings systems?
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