This book has been specially written to cater to teh needs of students of various diploma and engineering courses. Engineering materials or materials science, is a compulsory course for all engineering students.The present book has been written in a very simple language, easily understandable by students whose mother tongue is not English. Most of the technical concepts have been explained with the help of a large number of schematic diagrams, engineering curves, tables and microphotographs. The approach of the subject is illustrative, informative and demonstrative