This book presents full text peer-reviewed papers presented at the THERMEC 2023, the 12th International Conference on Processing and Manufacturing of Advanced Materials, which took place between July 03 and July 07, 2023, in Vienna, Austria, under the co-sponsorship of TU Wien and Graz University of Technology. The Conference was also under the auspices of professional organizations from Japan, Korea, France, Italy, The Netherlands, Germany, Brazil, Austria, India, and Canada. The Conference brought together researchers and engineers/technologists working in different aspects of processing, fabrication, structure/property evaluation and applications of both, ferrous and nonferrous materials including biomaterials, smart/intelligent materials as well as advanced characterisation techniques.