This book presents the select proceedings of the first International Conference on Energy and Materials Technologies (ICEMT) 2021, organized by the Department of Mechanical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, India. It covers the recent technologies in two broad thematic areas: energy and materials. Various topics covered in this book include advanced materials and characterization, mechanical behavior of materials, nanomaterials and nanotechnology, biomaterials, composite materials, environmental-friendly materials, structural materials, advances in aerospace technology, and advanced materials and manufacturing. The book is useful for students, researchers, and professionals in the area of mechanical engineering, especially various domains of materials.