Abstract
The hot deformation behaviors of 50 vol pct uncoated and Cr-coated diamond/Cu composites were investigated using hot isothermal compression tests under the temperature and strain rate ranging from 1073 K to 1273 K (800 °C to 1000 °C) and from 0.001 to 5 s−1, respectively. Dynamic recrystallization was determined to be the primary restoration mechanism during deformation. The Cr3C2 coating enhanced the interfacial bonding and resulted in a larger flow stress for the Cr-coated diamond/Cu composites. Moreover, the enhanced interfacial affinity led to a higher activation energy for the Cr-coated diamond/Cu composites (238 kJ/mol) than for their uncoated counterparts (205 kJ/mol). The strain-rate-dependent constitutive equations of the diamond/Cu composites were derived based on the Arrhenius model, and a high correlation (R = 0.99) was observed between the calculated flow stresses and experimental data. With the help of processing maps, hot extrusions were realized at 1123 K/0.01 s−1 and 1153 K/0.01 s−1 (850 °C/0.01 s−1 and 880 °C/0.01 s−1) for the uncoated and coated diamond/Cu composites, respectively. The combination of interface optimization and hot extrusion led to increases of the density and thermal conductivity, thereby providing a promising route for the fabrication of diamond/Cu composites.
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We acknowledge the financial supports of the National Key R & D Plan (No. 2017YFB0703101) and the National Science Fund for Distinguished Young Scholars (No. 51425203).
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Manuscript submitted August 14, 2017.
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Zhang, H., Liu, Y., Zhang, F. et al. Hot Deformation Behavior and Processing Maps of Diamond/Cu Composites. Metall Mater Trans A 49, 2202–2212 (2018). https://doi.org/10.1007/s11661-018-4547-x
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DOI: https://doi.org/10.1007/s11661-018-4547-x