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- Title
Mechanical Dissolution of Cu<sub>5</sub>Zr Phase and Formation of Supersaturated Solid-Solution Nanocrystalline Structure by High-Pressure Torsion in a Hypoeutectic Cu-2.7 at%Zr Alloy.
- Authors
Kenta Miyamoto; Takahiro Kunimine; Chihiro Watanabe; Ryoichi Monzen; Reza Gholizadeh; Nobuhiro Tsuji
- Abstract
Microstructural evolution and changes in hardness and electrical conductivities of a cast hypoeutectic Cu-2.7 at%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 Cu5Zr phases. The Cu and Cu5Zr phases in the eutectic had a cube-on-cube orientation relationship. The cast alloy with the hardness of 137HV exhibited 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 Cu5Zr 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 Cu5Zr phase into the Cu phase by the HPT, followed by the formation of a nanocrystalline Cu-Zr supersaturated solid-solution alloy with the hardness of 430HV.
- Subjects
TORSION; COPPER; ELECTRIC conductivity; COPPER-zirconium alloys; HYPEREUTECTIC alloys; X-ray diffraction; METALLIC glasses
- Publication
Materials Transactions, 2023, Vol 64, Issue 12, p2708
- ISSN
1345-9678
- Publication type
Article
- DOI
10.2320/matertrans.MT-D2023008