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The Fourth Edition of Mechanical Metallurgy continues its legacy as a comprehensive and authoritative text that bridges the fundamental principles of materials science with the practical demands of modern engineering. This updated edition expands upon the traditional topics of stress, strain, and deformation by integrating contemporary advancements in materials technology, manufacturing, and computational analysis. The book follows a structured progression—from the continuum description of mechanical behavior to the microscopic mechanisms that define plasticity, fracture, fatigue, and creep. New and enhanced chapters explore finite element methods, polymer and composite materials, and the role of advanced alloys in high-performance applications. With its balanced treatment of theory, testing, and real-world processing, the text provides a cohesive understanding of how materials respond to mechanical forces. Designed for both advanced undergraduate and graduate students, as well as practicing engineers, this edition emphasizes the connection between theory and practice through numerous examples, updated problems, and expanded coverage of emerging topics such as additive manufacturing and environmentally assisted failure. Throughout, the book remains a trusted resource for developing the analytical skills, engineering judgment, and materials insight needed for innovation in mechanical design and manufacturing.