Investigation on peripheral coarse grains and precipitation behavior of in-situ TiB2/Al–Cu–Mg composites with various Mg contents

As a primary alloying element, Mg strongly affects the microstructure and mechanical properties of Al matrix composites, while the corresponding mechanisms have not been clarified. In this study, the TiB2 reinforced Al–Cu–Mg composites with various Mg contents were fabricated following the procedures of salt-metal reaction, hot extrusion, solution, and peak aging. The results indicated that the surfaces of extruded composites were composed of...