Metal-matrix composites (MMCs) have been the subject of scientific investigation and applied research for some three decades, but only in the past few years have these materials become realistic candidates for engineering components such as electronic heat sinks, automotive drive shafts, ground-vehicle brake rotors, fighter-aircraft fins and jet-engine components. This special issue comprises 12 selected peer-reviewed papers covering various aspects of MMCs and highlights the most recent findings in this field. The papers focus mainly on light metal matrix composites, based upon Al, Mg and Ti alloys reinforced with particles, nano-dispersoids and long fibres. The results arise from both experimental investigations and computer simulations and the contributions deal with various key issues: production processes, microstructural characteristics, mechanical behaviour, welding using advanced techniques, workability and tribology. An invaluable and up-to-date guide to the field.Review from Book News Inc.: A dozen invited, peer-reviewed papers report recent developments in producing, processing, and applying the materials, emphasizing light metal matrix composites based on aluminum, magnesium, titanium alloys reinforced by particles, nano-dispersoids, and long fibers. Drawing from both experimental research and computer simulations, they consider such topics as simulating the mechanical behavior of metal matrix composites, friction welding particle reinforced aluminum-based composites, processing lightweight metal matrix composites with gas/liquid reactions, and producing and characterizing aluminum iron powder composites with ferromagnetic properties.