'Dislocation density' presentation slideshows

1.11k views • 47 slides

Robert H. Wagoner, PI, Myoung-Gyu Lee, Hojun Lim Department of Materials Science and Engineering

Meso-Scale Simulation and Measurement of Dislocation/Grain Boundary Interactions AFOSR Grant Number: FA9550-05-0068, 0088. Robert H. Wagoner, PI, Myoung-Gyu Lee, Hojun Lim Department of Materials Science and Engineering Ohio State University B. L. Adams, PI, Colin Landon, Josh Kacher

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Chapter 7: Dislocations and Strengthening Mechanisms in Metal

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675 views • 41 slides

Workshop on Mean Field Modelling for Discontinuous Dynamic Recrystallization

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CHAPTER 8: DEFORMATION AND STRENGTHENING MECHANISMS

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CHAPTER 7: DISLOCATIONS AND STRENGTHENING

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CHAPTER 7: DISLOCATIONS AND STRENGTHENING

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Strengthening of Crystalline Materials

Strengthening of Crystalline Materials. Dr. Richard Chung Department of Chemical and Materials Engineering San Jose State University. Learning Objectives. List and explain different strengthening mechanisms in a crystalline materials Discuss the methods to decrease the dislocation mobility

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PLASTIC DEFORMATION

PLASTIC DEFORMATION. Dislocations and their role in plastic deformation. What are dislocations?. Dislocations are line defects that exist in metals There are two types of dislocations: edge and screw The symbol for a dislocation is

1.08k views • 22 slides

Speaker: Kuok-Pan Sou Advisor: Ken- Yuh Hsu Chun-Yen Chang

Lasing Action of Core-Shell InGaN / GaN MQWs on GaN Nanorod Arranged in Photonic Quasicrystal Arrays. Speaker: Kuok-Pan Sou Advisor: Ken- Yuh Hsu Chun-Yen Chang. Introduction Motivation Experiment Fabrication Result and Discussion Crystalline Measurement Optical Measurement

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Material models

Material models. Work-hardening. mechanical-threshold-strength (MTS). Different Models. M icrostructural Metal Plasticity (MMP). Nes-Marthinsen-Holmedal. Kocks. Nes model. 3 internal variable model (3IVM). MTS Model. 1 microstructural parameter

385 views • 21 slides

Material models

Material models. Work-hardening. mechanical-threshold-strength (MTS). Different Models. M icrostructural Metal Plasticity (MMP). Nes-Marthinsen-Holmedal. Kocks. Nes model. 3 internal variable model (3IVM). MTS Model. 1 microstructural parameter

245 views • 21 slides

Dislocations + GB/Interfaces

Dislocations + GB/Interfaces. Stress at heterointerfaces can be relieved by dislocations Other dislocations interact with GBs & Interfaces In general, these are barriers Classic Hall-Petch effect. Boundaries as Barriers. GB+dislocation Dislocations in GB interact with dislocation

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Strain-Gradient Hardening

Strain-Gradient Hardening. Dr. Richard Chung Dept. of Chemical and Materials Engineering San Jose State University. Strain Gradients.

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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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530.352 Materials Selection

530.352 Materials Selection. Lecture #16: More about dislocations Wednesday October 19 th , 2005. Dislocation is the boundary between slipped and unslipped regions. ?. Motion of Edges. top moved to left. ?. ?. bottom moved to right. ?. ?. Motion of Screws. Annihilation of edges:.

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Conclusion

Conclusion. We demonstrated the optoelectrical characteristics of short- period MQWs LEDs with thickness-?uctuated InGaN well . Well thickness variation randomly distributed in the InGaN well could be created by introducing ramped H2 in the GaN barrier spacer layer .

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Peter K. Liaw, University of Tennessee Knoxville, DMR 0421219

Major Research Instrumentation (MRI): Development of an In-Situ Neutron Scattering Facility for Research and Education in the Mechanical Behavior of Materials. Peter K. Liaw, University of Tennessee Knoxville, DMR 0421219.

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Dislocations Jam at any Density

Dislocations Jam at any Density Plasticity and Avalanches: Connections Between Systems Ranging from Metals to Granular Materials Karin A. Dahmen, University of Illinois, Urbana Champaign, DMR 1005209. Dislocations Jam at any Density

200 views • 2 slides