Factors affecting diffusion rates 1.Concentration Gradient—driving force 2.Diffusing species & host material 3.Temperature.

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Presentation transcript:

Factors affecting diffusion rates 1.Concentration Gradient—driving force 2.Diffusing species & host material 3.Temperature

Diffusing Host MetalT( o C)D (m 2 /s) species Fe  -Fe (BCC) x Fe  -Fe (BCC) x Fe  -Fe (FCC) x Fe  -Fe (FCC) x Which diffuses faster? A.Fe through  -Fe at 500 o C B.Fe through  -Fe at 900 o C C.Fe through  -Fe at 500 o C D.Fe through  -Fe at 900 o C

How does diffusion affect material properties?

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Section Mechanical Properties of Metals: Elastic Deformation: Stress-Strain behavior

Mechanical Properties: How will the object respond to an applied load (force)? Stiffness Ductility Strength Toughness Hardness

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Brittle Failure: Tensile test of Nodular Graphite Cast Iron

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Elastic deformation of Composites Diving Board

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Plastic Deformation: Permanent

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Formed by plastic deformation; Behaves elastically Binder Clip

Plastic deformation of Metals–Spring shape Elastic deformation: Shock absorbers Springs absorb shock transmitted from road to vehicle.

Plastic Deformation Plastic deformation – Permanent Yielding – onset of plastic deformation Yield strength – Stress at yield (specified amount of strain).