Sustainable and Intelligent Machining of Advanced Materials: Emerging Trends and Future Directions
The rapid evolution of manufacturing technologies has intensified the need to align machining practices with sustainability and digital intelligence. Conventional machining processes, while productive, often result in high energy consumption, material waste, and limited adaptability to dynamic industrial demands. This review addresses the growing research gap in integrating sustainability principles with intelligent manufacturing systems for advanced materials. The primary objective of this study is to analyze and synthesize emerging trends, technologies, and frameworks that enable sustainable and intelligent machining. The review systematically examines recent advancements in Artificial Intelligence (AI), the Internet of Things (IoT), Additive and Hybrid Manufacturing, Digital Twins, and Cyber-Physical Systems (CPS). The methodology involves a comprehensive literature analysis of more than 130 peer-reviewed studies published between 2000 and 2025, emphasizing quantifiable sustainability metrics such as energy efficiency, CO2 emission reduction, and waste minimization. Key findings reveal that AI-driven predictive analytics, IoT-enabled monitoring, and additive-hybrid manufacturing platforms significantly enhance operational efficiency and resource utilization, while digital twin frameworks support real-time process optimization and lifecycle-based sustainability evaluation. A comparative evaluation highlights that these technologies collectively contribute to energy savings of up to 40%, CO2 reductions of 25%-35%, and waste minimization of 50% in selected industrial applications. The paper concludes with strategic recommendations for future research, including the standardization of sustainability metrics, transparent and explainable AI integration, and the development of unified digital ecosystems that combine data-driven intelligence with circular economy principles. This review thus provides a consolidated roadmap for achieving environmentally responsible, intelligent, and future-ready machining systems.