AC LEC 12-09

AC LEC 12-09 - Lecture 12 Solid Solutions and Crystal...

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Lecture 12 - Solid Solutions and Crystal Defects Alloys substitutional and interstitial solid solutions Crystalline Defects point defects line defects planar defects
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Engineering Metals Very few pure metals are used in engineering applications Pure Copper (conductors) Pure Aluminum (decorative) Metallic alloys: a) More than one metal b) Metals + nonmetals Types of alloys: a) Substitutional b) Interstitial
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Metallic Alloys Binary alloy Cartridge Brass (70%Cu + 30%Zn) 25 μ m Complex alloy Inconel 718 (53.4%Ni, 18.5%Cr, 18.5%Fe, 3.0%Mo, 5.0%Nb, 1.0%Ti, 0.5%Al)
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Substitutional Solid Solutions A solid solution in which the solvent and solute atoms are located randomly at the atom sites in the crystal structure of the solution. Solvent (r 1 ) Solute (r 2 ) No change in crystal structure of solvent Lattice may be distorted
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Hume-Rothery Rules for Solubility Conditions for extensive solid solubility Size criterion: (r 1 – r 2 ) < 15% Same crystal structure of 2 elements Low difference in electronegativity Same valence of the two elements
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Examples of Hume-Rothery Rules
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Interstitial Solid Solutions Solvent (r 1 ) Solute (r 2 ) α Fe (BCC)
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This note was uploaded on 02/27/2009 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.

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AC LEC 12-09 - Lecture 12 Solid Solutions and Crystal...

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