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<p>At temperatures ranging from 1 210 to 1 270 °C, pressure for 40 MPa and holding time for 10 min, higher density ultrafine-grained WC-Ni<sub>3</sub>Al cemented carbides with Ni<sub>3</sub>Al contents ranging from 5wt% to 20wt% were fabricated using spark plasma sintering. The influence of Ni<sub>3</sub>Al addition on the structure and properties of the WC-Ni<sub>3</sub>Al composites was investigated and characterized. The experimental results demonstrate that Ni<sub>3</sub>Al addition affects the sintering behavior of WC-Ni<sub>3</sub>Al cemented carbides. During sintering, Ni<sub>3</sub>Al possesses higher interfacial energy, thus inhibits the growth of WC grains, resulting in an average grain size of 280–330 nm of WC-Ni<sub>3</sub>Al composites, which is classified as ultrafine-grained. Furthermore, the increase in Ni<sub>3</sub>Al content results in a decrease in hardness but an improvement in fracture toughness. When the Ni<sub>3</sub>Al content reaches 15wt%, it aggregates to form “Ni<sub>3</sub>Al pools”, resulting in a significant hardness reduction of 14.02% compared to WC-10wt% Ni<sub>3</sub>Al composites. More fracture energy is consumed by cracks passing through the “Ni<sub>3</sub>Al pools”, thus enhancing the toughness of the material. The optimal comprehensive properties are obtained with a Ni<sub>3</sub>Al content of 10wt%, exhibiting a hardness of 1 866.8 HV, a fracture toughness of 11.79 MPa·m<sup>1/2</sup>, achieved a great balance between high hardness and high toughness than that of other studies.</p>

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Impact of Ni3Al Addition on Structure and Properties of Ultrafine-grained WC-Ni3Al Cemented Carbides by Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Meijun Yang,
  • Haifeng Kuang,
  • Liangliang Lin,
  • Qizhong Li,
  • Rong Tu,
  • Song Zhang

摘要

At temperatures ranging from 1 210 to 1 270 °C, pressure for 40 MPa and holding time for 10 min, higher density ultrafine-grained WC-Ni3Al cemented carbides with Ni3Al contents ranging from 5wt% to 20wt% were fabricated using spark plasma sintering. The influence of Ni3Al addition on the structure and properties of the WC-Ni3Al composites was investigated and characterized. The experimental results demonstrate that Ni3Al addition affects the sintering behavior of WC-Ni3Al cemented carbides. During sintering, Ni3Al possesses higher interfacial energy, thus inhibits the growth of WC grains, resulting in an average grain size of 280–330 nm of WC-Ni3Al composites, which is classified as ultrafine-grained. Furthermore, the increase in Ni3Al content results in a decrease in hardness but an improvement in fracture toughness. When the Ni3Al content reaches 15wt%, it aggregates to form “Ni3Al pools”, resulting in a significant hardness reduction of 14.02% compared to WC-10wt% Ni3Al composites. More fracture energy is consumed by cracks passing through the “Ni3Al pools”, thus enhancing the toughness of the material. The optimal comprehensive properties are obtained with a Ni3Al content of 10wt%, exhibiting a hardness of 1 866.8 HV, a fracture toughness of 11.79 MPa·m1/2, achieved a great balance between high hardness and high toughness than that of other studies.