Microstructural Features and Mechanical Properties of In Situ Formed ZrB2/Cu Composites

In situ reinforced copper matrix composites with improved mechanical properties are promising materials for various applications. In this work, an attempt has been made to explore the microstructural features and properties of in situ formed ZrB2/Cu composites using a liquid metallurgy route. XRD, SEM, XPS, and TEM analysis were used for micro-structural characterization. The results showed that ZrB2 particles could form through the reaction of Zr and B in molten Cu. The obtained composites consisted of hexagonal shaped ZrB2 and Cu(Zr) solid solution matrix. The in situ ZrB2/Cu composites exhibited improved microhardness. However, the electrical conductivity decreased with increasing weight fractions of ZrB2.