Mechanical Dissolution of Cu 5 Zr Phase and Formation of Supersaturated Solid-Solution Nanocrystalline Structure by High-Pressure Torsion in a Hypoeutectic Cu-2.7at%Zr Alloy

Microstructural evolution and changes in hardness and electrical conductivities of a cast hypoeutectic Cu-2.7at%Zr alloy processed by high-pressure torsion (HPT) were investigated. The cast alloy had a net-like microstructure composed of a primary Cu phase and a eutectic consisting of layered Cu and Cu 5 Zr phases. The Cu and Cu 5 Zr phases in the eutectic had a cube-on-cube orientation relationship. The cast alloy with the hardness of 137 HV exhib ited a value of electrical conductivity of 32%IACS. With increasing the number of HPT-revolutions, the eutectic was severely sheared and elongated along the rotational direction. In addition, mechanical dissolution of the C u 5 Zr phase into the Cu phase by the HPT was confirmed after 5 HPT-revolutions through XRD measurements and TEM observations. After 20 HPT-revolutions, the Cu phase was significantly refined and formed the lamellar structure having an average grain size of 15 nm. The electrical conductivity decreased and saturated at a value of 8%IACS after 50 HPT-revolutions. The significant decrease in the electrical conductivity was primarily attributable to the mechanical dissolution of the C u 5 Zr phase into the Cu phase by the HPT, followed by the formation of a nanocrystalline Cu-Zr supersaturated solid-solution alloy with the h a r d n e s s o f 4 3 0 H V.