Synthesis and characterization of high entropy (TiVNbTaM) 2AlC (M = Zr, Hf) ceramics

• DOI: 10.26599/jac.2024.9220847
• Publication Date: 2023-12-25T03:15:45Z
• Authors: Lei Cao; Qiqiang Zhang; Lijing Du; Shuai Fu; Detian Wan; Yiwang Bao; Qingguo Feng; Chunfeng Hu
• Keywords: Spark Plasma Sintering; Vickers hardness test; Hardening (computing)

The high-entropy design of MAX phases is expected to confer superior properties, but its study was hindered by the complex synthesis method and limited purity samples. In this work, two noteworthy types phase structural ceramics, (TiVNbTaM)₂AlC (M = Zr, Hf), were designed prepared <em>in-situ</em> using spark plasma sintering (SPS). microstructure lattice parameters sintered samples determined. Compared with single-component phases, highly pure (TiVNbTaZr)₂AlC sample had good physical mechanical including electrical conductivity 0.96 × 10⁶ Ω^-1·m^-1, thermal expansion coefficient 3.65 10^-6 K^-1, 8.98 W·m^-1·K^-1, Vickers hardness 9.80 GPa, flexural strength 507 MPa, fracture toughness 5.62 MPa·m^1/2·and compressive 1364 which exhibited remarkable hardening-strengthening effect.