This book introduces the physical mechanism of the plastic deformation of solids, which relies essentially on the occurence and motion of dislocations. These are linear defects, specific of crystalline solids whose motion under external stresses explains the relative ease by which solids (metals in particular) can be deformed in order to give them desired shapes. The objective is to introduce the topic to undergraduate students, restricting to the main ideas and showing their relevance in interpreting phenomena well known to everyone (e.g. why are certain metals harder than others?), and finally training the students in the practice of calculating the simplest properties of dislocations. Key Features: • The topics (dislocations and plasticity) are of interest to a wide range of university departments: materials science, civil, mechanical, or aeronautical engineering, as well as geology, condensed matter physics, etc. • Most books on the subject are monographs aimed at researchers. This is a textbook based on a recent teaching experience to undergraduate students, and adapted towards a concise introduction to the subject, in 8–10 lessons • Previous treatises were essentially written around 1960 (with later updating), during the period of clarification of the main ideas of the field. The present book benefits from recent experimental developments, which have extensively validated the main concepts

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