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Chapter 4.7

Chapter 4.7 - ¾ Grain boundary ¾ Imperfection ¾ Impurity...

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31 MSE 2090: Introduction to Materials Science Chapter 4, Defects in crystals Atomic Vibrations ¾ Thermal energy (heat) causes atoms to vibrate ¾ Vibration amplitude increases with temperature ¾ Melting occurs when vibrations are sufficient to rupture bonds ¾ Vibrational frequency ~ 10 13 Hz (10 13 vibrations per second) ¾ Average atomic energy due to the thermal excitation is of order k B T Atomic paths of two atoms in FCC lattice. MD simulations by Brandt, J. Phys: Condens. Matter 1 , 10002, 1989. d – equilibrium interatomic distance 50 d
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32 MSE 2090: Introduction to Materials Science Chapter 4, Defects in crystals Summary ¾ Alloy ¾ Atom percent ¾ Atomic vibration ¾ Boltzmann’s constant ¾ Burgers vector ¾ Composition ¾ Dislocation line ¾ Edge dislocation
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Unformatted text preview: ¾ Grain boundary ¾ Imperfection ¾ Impurity ¾ Interstitial solid solution ¾ Microstructure ¾ Point defect ¾ Screw dislocation ¾ Self-interstitial ¾ Solid solution ¾ Solute ¾ Solvent ¾ Substitutional solid solution ¾ Vacancy ¾ Weight percent Make sure you understand language and concepts: 33 MSE 2090: Introduction to Materials Science Chapter 4, Defects in crystals Reading for next class: Chapter 5: Diffusion Diffusion mechanisms (vacancy, interstitial) Steady-state diffusion (Fick’s first law) Nonsteady-state diffusion (Fick’s second law) Factors that influence diffusion Other diffusion paths Homework #2: 4.2, 4.9, 4.11, 4.18, and 4.D2 Due date: Monday, September 13....
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Chapter 4.7 - ¾ Grain boundary ¾ Imperfection ¾ Impurity...

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