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Conventional tungsten-copper (W-Cu) composites typically exhibit a homogeneous distribution of tungsten phase. However, there usually exists an trade-off between their mechanical properties and conductivity, thereby significantly limiting their potential applications. In this study, a novel approach was proposed to concurrently enhance the compressive strength, wear resistance, and electrical conductivity by constructing a layered hierarchical structure consisting of alternating copper layers and nano W-Cu layers. Compared with the uniform-structured W-Cu, it was found that the layered hierarchical W-Cu had an enhanced stress partitioning of the tungsten phase and a more concentrated distribution of current density in the copper layer. This resulted in improvements in both strength and conductivity. Furthermore, the development of a homogeneous oxide mixture layer on the wear scar surface contributes to a reduction in friction coefficient. When combined with the exceptional strength of the nanostructured W-Cu layer, the wear resistance of the layered hierarchical W-Cu was enhanced. This study highlights the pivotal role of multilevel structural design in development of high-performance bimetallic composites. © 2025 Elsevier Ltd
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Composite Structures
ISSN: 0263-8223
Year: 2025
Volume: 357
6 . 3 0 0
JCR@2022
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 9
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