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Materials Science > Defects & Diffusion > Flashcards

Defects & Diffusion Flashcards

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1
Q

What dimension are point defects found?

A

0D

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2
Q

What dimension are line defects found?

A

1D

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3
Q

What dimension are planar defects found?

A

2D

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4
Q

What dimension are volume defects found?

A

3D

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5
Q

True or false: vacancy only occurs in a few materials

A

False. Vacancy is found in all materials

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6
Q

What causes array expansion, atomic mobility & holes?

A

Vibrational energies due to temperature and the structure of crystal

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7
Q

What are the 3 main line defects?

A

edge dislocation, screw dislocation, mixed dislocation

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8
Q

What type of dislocation is caused by perpendicular Burgers vector?

A

Edge dislocation

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9
Q

What type of dislocation is caused by parallel Burgers vector?

A

Screw dislocation

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10
Q

What type of dislocation is caused by the Burgers vector always in the same direction?

A

mixed dislocation

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11
Q

What are some types of 2D (planar) defects?

A

external surfaces
grain boundaries
phase boundaries
twin boundaries
stacking faults
domain walls

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12
Q

How many grain boundaries would you expect for a polycrystalline structure?

A

MANY

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13
Q

What are some examples of 3D defects?

A

pores, cracks, foreign inclusions, other phases

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14
Q

What is a Frenkel defect?

A

paired set of cation vacancy + cation interstitial

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15
Q

What is a Shottky defect?

A

paired set of cation + anion vacancies

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16
Q

What are the characteristics of perfect metal crystals?

A

Higher electrical conductivity, higher thermal conductivity (more efficient metallic bonds). lower strength, higher ductility (more mobile dislocations)

17
Q

What are the 2 ways to express alloy composition?

A

Weight %
Atomic %

18
Q

What is ionic diffusion?

A

moving charges yield electrical conduction

19
Q

What is flux?

A

mass flow per unit area

20
Q

what is interdiffusion?

A

atoms migrate from high to low concentration

21
Q

What is diffusion via substitution?

A

through vacancies

22
Q

What is diffusion by interstitial motion?

A

small atoms can pass through matrix

23
Q

True or false: substitution diffusion is faster than interstitial motion

A

False. Interstitial diffusion is faster

Materials Science (5 decks)

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