Chapt 9 Solid Solutions

Chapt 9 Solid Solutions - EMA4120 Physical Metallurgy I,...

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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering EMA4120 Physical Metallurgy I Chapter 9: Solid Solutions Paul Holloway 202 Rhines Hall 846-3330 pholl@mse.ufl.edu
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Outline Solid solutions Substitutional Interstitial Hume-Rothery rules Carbon in iron Interstial solubility Cottrell atmospheres Atmosphere drag on dislocations Upper and lower sharp yield points Strain aging Dynamic strain aging
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Solid Solutions Substitution Interstitial O, B, C, H, N in transition metals: Fe, Ti, Zr, Ni, V, Cr, Mn, Mo, W, Th, U
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Hume-Rothery Rules for Substitutional Solid Solution Crystallography -for complete solid solution, A and B must have the same crystal structure Size factor -atomic sizes must be within 15% of one another for significant solid solution For large size mismatch, elastic strain energy affects properties, phase Valence factor -as the number of valence electrons/atom becomes different, solubility is limited For same e/atom ratio for A and B and other factors constant, solubility is larger Electronegativity -combinations of electropositive metals and electronegative elements (F, Cl, O) don’t form metallic bonds Form covalent or ionic bonds to produce compounds – Oxides, halides, intermetallic compounds (Mg 2 Si, Fe 3 Al, FeAl, FeAl 2 , Fe 2 Al 5 , FeAl 2 )
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Periodic Table
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Ni-Cu Complete Solid Solution FCC 2e/atom Both electropositive, ‘noble’ Cu-0.2551 nm, Ni-0.2487 nm, 2% misfit Lattice strain increase τ crss
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Cu-Ag fcc Valence e/atom same (column IB) Electropositive, ‘noble’ Cu-0.2551; Ag-0.2884 nm; 13% diff Eutectic phase diagram
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Al-Si fcc Al Diamond cubic Si Al +3 = 0.054 nm Si +4 = 0.04 nm
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EMA4120 Physical Metallurgy I, Chapt 9 Solid Solutions University of Florida, Dept. of Materials Science and Engineering Cu-Zn Brass Polycrystalline solid solution Peritectic phase diagram Eutectoid phase transition Cu-fcc; Zn-hcp; β-bcc
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Chapt 9 Solid Solutions - EMA4120 Physical Metallurgy I,...

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