MSE306Chap9SolidSolutions

MSE306Chap9SolidSolutions - Chapter 9: Solid Solution...

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Chapter 9: Solid Solution Alloys Principles of the alloy class… Interstitial – (e.g. Iron–Carbon system) Substitutional – Hume-Rothery Rules Phenomena related to solutions Snoeck effect Cottrel (solute) atmospheres Solid solution hardening Yield point peaks, Lüders bands, serrated flow, dynamic strain aging Consider an aluminum car… Lightweight, fuel economy, performance But…
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Self-interstitials in metals introduce large distortions in the surrounding lattice the energy of self-interstitial formation is ~ 3 times larger as compared to vacancies (Q i ~ 3 × Q v ) as a result, the equilibrium concentration of self-interstitials is very low (less than one self-interstitial per cm 3 at room T). Self-interstitials 1 2 3 4 5 Other point defects: self-interstitials, impurities Schematic representation of different point defects: (1) vacancy; (2) self-interstitial ; (3) interstitial impurity ; (4,5) substitutional impurities The arrows show the local stresses introduced by the point defects.
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Intersitial sites are small compared to lattice sites. Intersitial solute are typically much smaller atoms than their solvent atoms. Hume-Rothery and others determined that solute diameter < 0.59 solvent Carbon, Nitrogen, Oxygen, Hydrogen Transition metals typically have higher solubility than Nontransition metals What is a transition metal? 3.
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This note was uploaded on 11/24/2009 for the course MSE 306 taught by Professor Smith during the Spring '09 term at UVA.

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MSE306Chap9SolidSolutions - Chapter 9: Solid Solution...

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