The book "Theory and practice of deformation methods of formation of nanocrystalline structure in metals and alloys" is a unique publication created by a team of authors who are recognized specialists in the field of materials science and metallurgy. This work is an in-depth study on modern methods of forming nanocrystalline structures in metals and alloys, making it an important contribution to the scientific community and practical metallurgy. In recent decades, nanocrystalline materials have attracted increasing attention due to their outstanding mechanical properties and high resistance to corrosion. The book covers a wide range of topics, ranging from the theoretical foundations of deformation methods to the practical aspects of their application in industry. The authors examine in detail various technologies, such as extrusion, rolling and forging, which allow creating unique structures at the nanoscale. The reader will be able to learn about how deformation processes affect the microstructure and, consequently, the properties of metals and alloys. This book will be of interest not only to specialists in the field of materials science and metallurgy, but also to students, graduate students and teachers who want to deepen their knowledge in this field. It can also attract the attention of engineers and researchers working in related fields such as mechanics, physics, and materials chemistry. The age category of readers varies from senior students to experienced professionals, making the book a universal source of knowledge. The topics raised in the book cover both fundamental aspects and applied research. The authors discuss the influence of various deformation parameters on the formation of nanocrystalline structure, which allows the reader to understand how to control the properties of materials to achieve the desired results. An important aspect is also the consideration of environmental and economic factors associated with the production and use of nanocrystalline materials, which makes the book relevant in the context of modern sustainable development challenges. The style of the authors is distinguished by scientific rigor, supported by extensive experimental data and examples from practice. Each chapter of the book is filled with illustrations, graphs and tables, which makes the material more accessible to perception. The team of authors includes both experienced scientists and young researchers, which creates a unique synergistic effect and allows you to look at the problem from different angles. The book "Theory and practice of deformation methods of nanocrystal structure formation in metals and alloys" will be an indispensable tool for those who seek to understand the complex processes occurring at the nanoscale, and apply this knowledge in their professional activities. It may also be of interest to those looking for new approaches to creating materials with unique properties, which opens the door to innovative solutions in various industries. If you are looking for literature that combines theory and practice, as well as current research in the field of materials science, then this publication is definitely worth your attention. Do not miss the opportunity to immerse yourself in the world of nanocrystalline structures and discover new horizons in metallurgy!