Metallurgical and Materials Transactions A

, Volume 49, Issue 6, pp 2202–2212 | Cite as

Hot Deformation Behavior and Processing Maps of Diamond/Cu Composites

  • Hongdi Zhang
  • Yue Liu
  • Fan Zhang
  • Di Zhang
  • Hanxing Zhu
  • Tongxiang FanEmail author


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.



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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Hongdi Zhang
    • 1
  • Yue Liu
    • 1
  • Fan Zhang
    • 1
  • Di Zhang
    • 1
  • Hanxing Zhu
    • 2
  • Tongxiang Fan
    • 1
    Email author
  1. 1.State Key Laboratory for Metal Matrix Composites, School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.School of EngineeringCardiff UniversityCardiffUK

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