'Edge dislocation' diaporamas de présentation

DISLOCATIONS

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The Solid State Crystalline and Amorphous Solids Ionic Crystals

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Chapter 7: Dislocations & Strengthening Mechanisms

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Failure of Materials

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YouTube: SEM study of slip in deformed cadmium single crystal

Predicted by Theory: YouTube: Slip by movement of whole lattice planes. Reduced Strength due to Dislocations: YouTube: Model of slip by the movement of an edge dislocation Dislocation processes in precipitation-hardened metals during in situ deformation in an HVEM

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Dislocation

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Chapter 7

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Lecture 3.0

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Interfaces in Solids

Interfaces in Solids. Coherent without strain. Matching spacing but with different crystal structure . Same crystal structure (& lattice spacing) but different composition. Schematics of strain free coherent interfaces. Coherent strained. Region with Tensile Stresses. Interface.

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CHAPTER 3: INELASTIC DEFORMATION

CHAPTER 3: INELASTIC DEFORMATION. CHAPTER 3: INELASTIC DEFORMATION. CHAPTER 3: INELASTIC DEFORMATION. CHAPTER 3: INELASTIC DEFORMATION. CHAPTER 3: INELASTIC DEFORMATION. Point Defects. CHAPTER 3: INELASTIC DEFORMATION. Vacancy. distortion . of planes. self-. interstitial.

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Chapter 3 dislocation

Chapter 3 dislocation. The yield strength of a perfect crystal . ? = ? max sin ( ? = G ? = G ? = ? max ? max = . Whiskers defect-free crystal ? = G/30 for aluminum ? y = 9 x 10 8 N/m ideal strength 7.8 x 10 5 N/m real strength.

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Figure 10-4. Atomic Point defects.

Point Defects. Figure 10-4 illustrates four types of point defects. A vacancy , or vacant lattice site, exists when an atom is missing from a normal (Bravais) lattice position. Figure 10-4. Atomic Point defects.

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Project III Q&A

Project III Q&A. Friday, 11/15/2002. MPM Simulation on Contact. Timestep (upper limit). We cannot expect to simulate waves with a velocity higher than let dynamic information to pass one cell size in just one steps. We can take. Timestep (lower limit).

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METALS

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Dislocation Basics

Dislocation Basics. Basic reading. Introduction to Dislocations D. Hull and D.J. Bacon Pergamon Press, Oxford (1984). Advanced reading (comprehensive). Theory of Dislocations J. P. Hirth and J. Lothe McGraw-Hill, New York (1968).

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Dislocation Lecture Summary for 22.71 on 10_4_2012

Dislocation Lecture Summary for 22.71 on 10_4_2012. Elliott Fray. Outline. What is a dislocation? Localized and Non-localized deformation Characterizing dislocations Dislocation types S tress field of a dislocation Edge type , Screw Type Slip Systems Applications.

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L05B: Line defects (dislocations)

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Dislocations Animations

Dislocations Animations. Movement of edge dislocation Movement of mixed dislocation Frank-Reed model. BACK.

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