Strengthening - Grain Size Solid Solution Precipitates...

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Grain Size Solid Solution Precipitates Dislocation Summary Refinement of Grain Size Transverse Extrusion Extrusion Linear dimensions: Rolled Trans Transverse: ~ 100-300 nm; average: 150 nm Extrusion: ~ 260~ 562nm; average: 390 nm
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Dislocation walls and precipitates
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Dislocation lines in Dislocation lines in AlN AlN
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Solid solution atoms
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all etch elationship Grain Size Solid Solution Precipitates Dislocation Summary Hall Hall-Petch Petch Relationship Relationship 1/2 Δ σ= yy kd d 190nm 0 28MPa m = y k0 .28MPa m 640MPa = Δσ= K y : Witkin & Lavernia, 2006
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Hall Hall-Petch Petch coefficients for pure metals coefficients for pure metals Materials Ky, Mpa-m 1/2 opper 14 Copper 0.14 Aluminum 0.04 Gold 0.25 Nickel 0.16 Zinc 0.22 Magnesium 0.28 Titanium 0.40 Cobalt 0.29 rmco on 58 Armco Iron 0.58 Molybdenum 1.77 Tantalum 0.31 Tungsten 3.1
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ariation of Hall etch slope K with Mn Grain Size Solid Solution Precipitates Dislocation Summary Variation of Hall Variation of Hall-Petch slope K with Mn Petch slope K with Mn g% Mg% k Pure Al 0 0.09 AA5052 2.55 0.23 AA5754 2.60-3.60 0.22 AA5182 4.0-5.0 0.30 Mn y Mg y
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Strengthening - Grain Size Solid Solution Precipitates...

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