On decreasing the grain size of a polycrys talline material, the property most likely to deteriorate is
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Metallurgical Engineering · all questionsMaterial Science in Metallurgy
Material Science in Metallurgy
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Most important property of steels for use in automoblie bodies is
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p-type semi-conductor can be obtained by doping silicon with
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Liquid nitrogen containers can be made, from
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Match the types of corrosion in Group 1 with their examples in Group 2.
| Group 1 | Group 2 |
| P. Galvanic corrosion | 1. Season cracking in brass |
| Q. Filiform corrosion | 2. Nut-bolt assembly with gasket |
| R. Stress corrosion cracking | 3. Brass fittings joined with lead-tin solder |
| S. Crevice corrosion | 4. Painted food can |
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With respect to the matrix of Al-Cu alloys, G-P zones are
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Which one of the following microstructures of a Ni-base superalloy imparts the highest creep resistance?
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Titanium is added to molten aluminium alloys before casting for the purpose of
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To obtain super-plasticity, the alloy should
P. have a fine grain structure that is also stable at high temperature
Q. be deformed at low temperature
R. be deformed at low strain rates
S. be deformed at high strain rates
P. have a fine grain structure that is also stable at high temperature
Q. be deformed at low temperature
R. be deformed at low strain rates
S. be deformed at high strain rates
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Match the cast irons in Group 1 with the distinguishing microstructural features in Group 2.
| Group 1 | Group 2 |
| P. Grey cast iron | 1. Temper graphite |
| Q. Ductile cast iron | 2. Pearlite |
| R. Malleable cast iron | 3. Graphite flakes |
| S. White cast iron | 4. Massive cementite |
| 5. Nodular graphite |
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Match the alloy names listed in Group I with the main elements present in them listed in Group II.
| Group I | Group II |
| P. Babbit | 1. Fe-Ni |
| Q. Muntz metal | 2. Ni-Cr-Fe |
| R. Invar | 3. Cu-Zn |
| S. Inconel Group II | 4. Sn-Sb-Cu |
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Silicon crystal can be converted to p-type semi-conductor by doping with
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The fatigue resistance of material is improved by the following techique:
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Young's modulus of a material gives an idea about
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In polymers such as epoxy, creep resistance can be enhanced by
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A small amount of thoria is doped into tungsten filament wires used in light bulbs. This is because thoria particles
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Super alloys are
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Match the materials in Group 1 with the Young's modulus (GPa) in Group 2.
| Group 1 | Group 2 |
| P. Copper | 1. 4 |
| Q. Ployvinyl cholride | 2. 37 |
| R. Steel | 3. 70 |
| S. Silicate glass | 4. 110 |
| 5. 207 | |
| 6. 700 |
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Increasing the carbon content of steel
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Lithium is a useful alloying addition to aluminium, because it
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