A. As the average grain size increases, the grain boundary energy per unit area deceases
B. The driving force for grain growth is the decrease in grain boundary energy per unit volume of the material
C. Higherthe temperature, the faster is the grain growth
D. Impurity atoms segregated at grain boundaries can retard grain growth
Answer: Option A
This Question Belongs to Metallurgical Engineering >> Physical Metallurgy
A plastically deformed metal crystal at low temperature exhibits wavy slip line pattern due to
A. Dislocation pile-up
B. Large number of slip systems
C. Low stacking faultenergy
D. Dislocation climb
Which of the following microstructures of the eutectic is not observed in binary alloys?
A. Lamellar
B. Widmanstatten
C. Acicular
D. Nodular
Upon addition of sodium oxide to molten silicate slag, the viscosity of the slag
A. decreases because the oxygen ions supplied by the sodium oxide break the chain structure of the silicate slag
B. increases because the oxygen ion supplied by the sodium oxide further add to the oxygen network in the slag
C. remains unaffected because fundamentally one can not distinguish between the oxygen ions supplied by the sodium oxide and those already present in the slag
D. remains unaffected because the oxygen ions fill up the holes and vacancies present in the liquid slag
A. P-4, Q-3, R-2, S-1
B. P-1, Q-2, R-3, S-4
C. P-2, Q-4, R-1, S-3
D. P-2, Q-4, R-3, S-1
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