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Late News Poster Session: Fundamentals and Characterization
Program Organizers: MS&T Administration, MS&T PCC

Tuesday 10:00 AM
November 3, 2020
Room: Poster Hall
Location: MS&T Virtual

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Microstructural Evolution and Mechanical Properties of a Cu-2.7at.%Zr Alloy Processed by High-Pressure Torsion: Kenta Miyamoto¹; Takahiro Kunimine¹; ¹Kanazawa University
    Applying severe plastic deformation to dual-phase materials is an efficient way to obtain high-strength nanostructured materials. Here, we report on the microstructural evolution and mechanical properties of a cast hypoeutectic Cu-2.7at.%Zr alloy processed by high-pressure torsion (HPT) up to 50 rotations. The initial cast alloy had a net-like microstructure composed of a primary Cu phase and an eutectic phase consisting of Cu and Cu5Zr. With increasing the number of HPT-rotations, the eutectic phase were severely sheared and elongated along the rotational direction. After 20 HPT-rotations, the Cu matrix and Cu5Zr phase were significantly refined and formed the lamellar structure having the average lamellar spacing of 15 nm. The ultimate tensile strength significantly increased and reached the saturation value of 1660 MPa after 50 HPT-rotations. The strengthening mechanisms were considered based on the grain refinement to the nano-scale, high dislocation density, and dispersion of oriented Cu5Zr short-fibers in the matrix.

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