Impact of Defects on Diffusion in Crystalline Materials - Prof. Maria G. Juenger, Study notes of Civil Engineering

Download Impact of Defects on Diffusion in Crystalline Materials - Prof. Maria G. Juenger and more Study notes Civil Engineering in PDF only on Docsity! • Imperfections in Crystalline Materials • Reading: Chapter 2, sections 2.2.2-2.2.4 CE 314K Fall 2009 Properties and Behavior of Engineering Materials • Learning objectives – Describe and give examples of the following types of common imperfections: – 1-D, 2-D, 3-D, Interfacial – Explain how imperfections affect diffusion 1-D Imperfections OOCOOOO+D 5355555 (c) (d) Tensile Compressive Interfacial Imperfections Angle of misalignment | 1 ~ High-angle grain boundary i— Low-angle grain boundary OO Ta ~ ge) Yar SO OSE Angle of misalignment Diffusion S688 XX — —s OOO =— Energy | a | q(E,) = 1 (a) Movement without a vacancy present ORR Boe EB CAS S000 WI (b) Movement with a vacancy present Energy