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In AMIE Study material on DIFFUSION IN SOLIDS for ad 302 you will find
• Materials often heat treated to improve properties
• Atomic diffusion occurs during heat treatment
• Depending on situation higher or lower diffusion rates desired
• Heat treating temperatures and times, and heating or cooling rates can be determined using the mathematics/physics of diffusion
Example: steel gears are “case-hardened” by diffusing C or N to outer surface

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