Dislocation theory

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Dislocation pile-ups pile ups Dislocations often pile up on slip planes at barriers i.e., grain boundaries or second phase particles. High stress concentration on the leading dislocations in the pile-up. If the pile-up stress > theoretical shear stress yielding A pile-up of n dislocations along a distance L can be considered as a giant dislocation with a Burgers vector nb. Dislocation pile-ups at an obstacle. The breakdown of a barrier occur by 1) Slip on a new plane. 2) Climb of dislocation around the barrier. 3) Generation of high enough tensile stress to produce a crack. Suranaree University of Technology May-Aug 2007 Tapany Udomphol
References • Dieter, G.E., Mechanical metallurgy, 1988, SI metric edition, McGraw-Hill, ISBN 0-07-100406-8. • Sanford, R.J., Principles of fracture mechanics, 2003, Prentice Hall, ISBN 0-13-192992-1. • W.D. Callister, Fundamental of materials science and engineering/ an interactive e. text., 2001, John Willey & Sons, Inc., New York, ISBN 0-471-39551-x. • Hull, D., Bacon, D.J., Introduction to dislocations, 2001, Forth edition, Butterworth-Heinemann, ISBN 0-7506-4681-0. Suranaree University of Technology May-Aug 2007 Tapany Udomphol
Page 1 and 2: Dislocation theory Subjects of inte
Page 3 and 4: Objectives • This chapter emphasi
Page 5 and 6: Observation of dislocations A varie
Page 7 and 8: Transmission electron microscope (T
Page 9 and 10: Burgers vector and the dislocation
Page 11 and 12: Burgers circuit Burgers circuit is
Page 13 and 14: Dislocation dissociation Dislocatio
Page 15 and 16: Dissociation of a dislocation into
Page 17 and 18: Frank partial dislocations Frank pa
Page 19 and 20: Dislocations in HCP lattice • Sli
Page 21 and 22: Stress fields of dislocations A dis
Page 23 and 24: Forces on dislocation ds b dl Force
Page 25 and 26: Dislocation climb Dislocation climb
Page 27 and 28: Jogs and Kinks Jogs are steps on th
Page 29 and 30: Intersection of two dislocations 2)
Page 31 and 32: Jogs • A stable jog length of the
Page 33 and 34: Dislocation Sources • All metals
Page 35: Dislocation-point Dislocation point

Dislocation theory

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