10 Questions
What are the two essential conditions for an atom to make a move during diffusion?
Presence of empty adjacent site and sufficient energy
What is the name of the mechanism that involves the interchange of an atom from a normal lattice position to an adjacent vacant lattice site?
Vacancy diffusion
What is the prerequisite for vacancy diffusion to occur?
Presence of vacancies
What happens to the diffusing atoms and vacancies during vacancy diffusion?
They exchange positions
What type of diffusion involves atoms migrating from an interstitial position to a neighboring empty one?
Interstitial diffusion
What is a necessary condition for significant concentrations of vacancies to exist in metals?
Elevated temperatures
Which type of diffusion occurs when impurity atoms substitute for host atoms?
Interdiffusion
What is the direction of motion of vacancies during vacancy diffusion?
Opposite direction of the diffusing atoms
What is the name of the process that involves the movement of atoms in a lattice?
Diffusion
What is the result of the interaction between diffusing atoms and vacancies during vacancy diffusion?
Exchange of positions
This quiz covers the addition of impurities to metals, resulting in solid solutions and/or new phases, and the types of impurity point defects, including dislocations and linear defects.
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