PCD polycrystalline diamond with AlCoCrFeNi2.1 HEA high‐entropy alloys as binder

PCD polycrystalline diamond with AlCoCrFeNi2.1 eutectic high‐entropy alloys as binder

Polycrystalline diamond (PCD) tool performance is influenced by the binder phase’s adhesion and catalytic effects.

AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA), as a novel binder, demonstrating superior interface strength with diamond compared to conventional binder cobalt.

PCD samples with HEA were synthesized under 8.0 GPa and 1500–1700°C. Key performance metrics—including thermal expansion, hardness, rupture strength, compressive strength, and wear resistance—were evaluated. HEA/PCD exhibited lower thermal expansion (5.63 × 10⁻⁶ /K vs. 9.93 × 10⁻⁶ /K for Co/PCD), higher hardness (60.13 GPa, +20.4%), and improved rupture (+22.2%) and compressive strength (+22.4%).