A novel copper matrix composite suitable for traditional casting by designing in-situ formed high-entropy diboride particles

Conductive ceramics reinforced copper matrix composites have made a breakthrough in the research of high strength and high conductivity, but their application is limited due to the advanced preparation technology and manufacturing cost. Casting technology, as the most widely preparation technology, is relatively less used in the composites due to the macro-segregation caused by the large difference in density and the micro-agglomeration caused by the poor interfacial wettability. In this work, a novel of (TiZrHfCrTa)B₂ particles with a density close to the matrix was actively designed to avoid the macro-segregation. Meanwhile, the interfacial transition layer formed by Cr segregation plays a role of interfacial modification, which improved the interfacial wettability and avoided serious micro-agglomeration. Finally, a novel composite with high strength, high conductivity and more suitable for the traditional casting was prepared, which is expected to produce more economical and excellent composites.