Materials Science and Engineering - Imperfections in the atomic arrangements
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What are the 3 types of defects? | show 🗑
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| Based on bond strength alone, most materials SHOULD be much ____(stronger/weaker) than they are. | show 🗑
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| show | False
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| What is the difference between impurities and dopants? | show 🗑
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| A ___ is produced when an atom is missing. | show 🗑
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| Vacancies are introduced into metals and alloys during ___ at ___ temperatures or as a consequence of radiation damage. | show 🗑
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| Concentration of vacancies ___(increases/decreases) exponentially as temperature is increased. | show 🗑
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| show | n_v = ne^(-Q_v/RT)
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| In n_v = ne^(-Q_v/RT), n_v = ___. | show 🗑
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| n_v = ne^(-Q_v/RT), n = ___. | show 🗑
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| show | activation energy
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| show | ideal gas constant = 1.987 (cal/mol-K) or 8.31 (joules/mol-K)
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| n_v = ne^(-Q_v/RT), T = ___. | show 🗑
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| show | dislocation
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| show | edge, screw, mixed
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| show | make a dislocation move (slip)
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| An edge dislocation is ___. | show 🗑
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| show | Burgers
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| For edge dislocations, Burgers vector is ___ to the dislocation line. | show 🗑
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| show | shear
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| show | it creates an edge on the surface
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| A screw dislocation is a ___. | show 🗑
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| show | parallel
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| When a dislocation moves it is called ___. | show 🗑
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| show | close packed planes, close packed
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| show | slip systems
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| show | FCC
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| show | BCC
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| show | HCP
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| T or F? The more ductile a material, the less strength and vice versa. | show 🗑
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| T or F? Dislocations weaken a material. | show 🗑
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| Frank Read Source says that applying force to a material ___(increases/decreases) the number of dislocations. | show 🗑
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| show | False
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| Name the types of point defects. | show 🗑
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| show | Frenkel, Schottky
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| Frenkel defects are ___. | show 🗑
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| Schottky defects are ___. | show 🗑
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| With Schottky defects, the overall charge ___. | show 🗑
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| show | Frenkel and Schottky
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| show | False
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| show | decreased
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| show | yield strength, σ_y = σ_0 + K/√d
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| show | a constant for the metal
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| For the Hall-Petch equation σ_y = σ_0 + K/√d, K = ___. | show 🗑
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| For the Hall-Petch equation σ_y = σ_0 + K/√d, d = ___. | show 🗑
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| show | N = 2^n-1
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| N = the number of grains per ___ at a magnification of ___. | show 🗑
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| show | glass
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| Amorphous metals are also called ___. | show 🗑
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| T or F? There are no slip planes in glass. | show 🗑
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| Amorphous metals are made by ___ which makes it hard for metals to crystalize. | show 🗑
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| The brand name for liquid metal is called ___. | show 🗑
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