Quasi-static and dynamic response of a Cu/Nb composite following equal channel angular extrusion
The article presents a study of the plastic properties of a Cu–18%Nb composite following equal channel angular extrusion under both low- and high-strain rate loadings. The microstructures are characterized by optical and scanning electron microscopy as well as electron backscatter diffraction. Compa...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 853; p. 143711 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
15.09.2022
Elsevier BV Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The article presents a study of the plastic properties of a Cu–18%Nb composite following equal channel angular extrusion under both low- and high-strain rate loadings. The microstructures are characterized by optical and scanning electron microscopy as well as electron backscatter diffraction. Comparisons are also made with a Cu–50%Nb laminate made by accumulative roll bonding. Textures obtained within the respective phases in the extruded composite closely mimic those previously reported for the pure components alone (Cu, Nb). Grain sizes of the major phase (Cu) exhibit broad distributions, due largely to partial recrystallization during the extrusion process. Further re-crystallization is obtained within localized deformation bands produced at high strain rates (3 × 103 s−1). While the degree of anisotropy and the strain rate sensitivity of the composite response are similar to those of pure Cu after extrusion, the strength levels of the composite are somewhat greater, falling broadly between those obtained in the pure components after extrusion to comparable plastic strains. The implications for selection of composite composition and processing for achieving higher strengths are briefly discussed. |
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Bibliography: | NA0003857; DMR 1720256 National Science Foundation (NSF) USDOE National Nuclear Security Administration (NNSA) |
ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2022.143711 |