Ex03 Diffusion Structures and Properties of materials

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12 Terms

1

Activation Energy

minimum energy required for a chemical reaction to occur.

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2

Carburizing

Diffuse carbon atoms into host iron atom at the surface. increases the hardness and wear resistance of the iron.

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3

Diffusion

movement of atoms within a material

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4

Diffusion coefficient

D [m²/2]

<p>D [m²/2]</p>
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5

Diffusion flux

J=M/At

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6
<p>Ficks First Law</p>

Ficks First Law

high concentration to low concentration

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7
<p>Ficks second Law</p>

Ficks second Law

prediction of change in concentration gradient with time due to diffusion

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8

Interstitial diffusion

smaller attoms diffuse between atoms (more rapid then vacancy diffusion)

<p>smaller attoms diffuse between atoms (more rapid then vacancy diffusion)</p>
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9

Non steady-state diffusion

a time dependent process in which the rate of diffusion is a function of time

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10

Self-diffusion

In an element solid atoms also migrate.

<p>In an element solid atoms also migrate. </p>
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11

Steady-state diffusion

the net movement of a species down a concentration gradient, from an area of high concentration to an area of low concentration

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12

Vacancy diffusion

atoms exchange with vacancies.

<p>atoms exchange with vacancies. </p>
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