TY - JOUR
T1 - Joining of high-entropy ceramics (HEC) to Nb using CoFeCrNiCu high-entropy alloy as filler via spark plasma sintering
AU - Zhang, Rui
AU - Wang, Gang
AU - Wang, Wei
AU - Zhao, Yu
AU - He, Rujie
AU - Tan, Caiwang
N1 - Publisher Copyright:
© 2026 Published by Elsevier Ltd.
PY - 2026/11
Y1 - 2026/11
N2 - The (TiZrHfNbTa)C high-entropy ceramic (HEC) and Nb were joined by spark plasma sintering, with CoFeCrNiCu high-entropy alloy serving as the filler material. The typical microstructure of the joint consists of HEC/FCC, Laves, Cu(s,s), and NbC. The impact of joining temperature and holding time on the microstructure, shear strength, and fracture path of the HEC/CoFeCrNiCu/Nb joints were systematically investigated. At the same time, the phase formation mechanism and microstructure evolution of the joint during SPS process are explained. The shear strength of the joint reached a maximum of 52 MPa at room temperature after holding at 1100 °C for 6 min. The high-entropy effect of the CoFeCrNiCu filler promotes the formation of the FCC phase in the central region of the joint. Additionally, due to the diffusion of Nb and C, a diffusion transition layer consisting of the Laves phase and NbC forms near the Nb side, contributing to the enhancement of the shear strength.
AB - The (TiZrHfNbTa)C high-entropy ceramic (HEC) and Nb were joined by spark plasma sintering, with CoFeCrNiCu high-entropy alloy serving as the filler material. The typical microstructure of the joint consists of HEC/FCC, Laves, Cu(s,s), and NbC. The impact of joining temperature and holding time on the microstructure, shear strength, and fracture path of the HEC/CoFeCrNiCu/Nb joints were systematically investigated. At the same time, the phase formation mechanism and microstructure evolution of the joint during SPS process are explained. The shear strength of the joint reached a maximum of 52 MPa at room temperature after holding at 1100 °C for 6 min. The high-entropy effect of the CoFeCrNiCu filler promotes the formation of the FCC phase in the central region of the joint. Additionally, due to the diffusion of Nb and C, a diffusion transition layer consisting of the Laves phase and NbC forms near the Nb side, contributing to the enhancement of the shear strength.
KW - High entropy alloy
KW - High-entropy carbide ceramic
KW - Interface microstructure
KW - Joining
KW - Shear strength
KW - Spark plasma sintering
UR - https://www.scopus.com/pages/publications/105045017023
U2 - 10.1016/j.vacuum.2026.115667
DO - 10.1016/j.vacuum.2026.115667
M3 - Article
AN - SCOPUS:105045017023
SN - 0042-207X
VL - 254
JO - Vacuum
JF - Vacuum
M1 - 115667
ER -