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AC LEC 22-09 - Grains forming Annealed 4 sec at 580 o C...

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Lecture 22 -Microstructure and the Mechanical Properties of Metals Strengthening Mechanisms solid solution strain hardening grain size precipitation Effect of Microstructure Impact Fatique Creep
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Strengthening Mechanisms in Metals Grain Boundaries Cold Working Solid Solution strengthening Second Phase particles
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Single Crystal vs. Polycrystal Cu
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Dislocations Pile-Up at Grain Boundaries
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Grain Boundaries are Obstacles to Slip Slip Bands in Polycrystalline Copper
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Strength is Effected by Grain Size Hall-Petch Equation σ y = σ 0 + k /(d) 1/2
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Effect of Plastic Deformation on Grain Shape Rolling Direction
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Cold Forming: Flow Lines
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Effect of Plastic Deformation on Mechanical Properties
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Strain Hardening of Metals Strength Ductility
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Frank-Read Dislocation Sources
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Cold Worked Microstructure High Dislocation Density
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Recrystallized Microstructure Low Dislocation Density
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Recrystallization of α Brass Next 4 Slides 33 % Cold Work
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Recrystallization of α Brass Annealed 3 sec at 580ºC Note NEW Strain-free
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Unformatted text preview: Grains forming Annealed 4 sec at 580 o C Annealed 8 sec at 580 o C Recrystallization of α Brass Grain Growth 15 min at 580 o C Grain Growth 10 min at 700 o C Recrystallization of α Brass Effect of Annealing on Mechanical Properties Solid Solution Strengthening CuNi Alloy Solid Solution Strengthening Solute atom SMALLER than Solvent atom Solute atom LARGER than Solvent atom Yield Point Behaviour of Steels Engineering Materials Precipitation Hardening Al-Cu alloys (2024 T3) Multi-phase alloys Steel (BCC Fe with Fe 3 C) Duplex Alloys Nickel base Superalloys Summary - Lecture 22 Polycrystals are stronger than Single Crystals Strength increases as grain size decreases Strength INCREASES as % CW increases Ductility DECREASES as % CW increases 3 Steps in Annealing: Recovery Recrystallization Grain Growth Solid solution strengthening http://www.mtsnano.com/...
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