TY - JOUR
T1 - Interfacial optimization by CPED coating for improving mechanical properties of Nbf/TiAl composite
AU - Zhou, Mi
AU - Hu, Rui
AU - Li, Jinguang
AU - Zou, Hang
AU - Gao, Zitong
AU - Luo, Xian
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/2
Y1 - 2024/2
N2 - Continuous Nb fiber-reinforced TiAl-matrix (Nbf/TiAl) composites with low density and excellent high temperature performance has been considered as a potential structural material to satisfy the service requirements in space industry. However, premature cracking failure caused by serious interfacial reaction (forming brittle phases and micro-crack) in the interface accelerates the failure of the composite. Depositing the inert coating on the Nb fiber surface could reduce and even prevent the interfacial reaction, improving the interfacial structure between Nb fiber and TiAl matrix. In this work, an efficient coating technology, cathodic plasma electrolytic deposition (CPED), was utilized to deposit Al2O3 coating on the Nb fiber surface, which successfully prevented the brittle phases formation at the interface between Nb fibers and TiAl matrix. The reliable and simple interface composed of Nb/Al2O3/TiAl was prepared through the careful adjustment of CPED parameters. The high-strength interface ameliorated the stress distribution, especially increasing the stress borne of Nb fibers by 40 % during the loading process. As a result, the optimized interface avoided premature cracking in interfacial region at initial loading stage and promoted the crack deflection and bifurcation at the overall deformation. Finally, the fracture toughness of the composite after interfacial optimization is increased by 30 % than that of without coating and 70 % than that of TiAl matrix. The above findings validate the feasibility of CPED technology in regulating the interface structure of composite materials, and provide a new method for interface structure design.
AB - Continuous Nb fiber-reinforced TiAl-matrix (Nbf/TiAl) composites with low density and excellent high temperature performance has been considered as a potential structural material to satisfy the service requirements in space industry. However, premature cracking failure caused by serious interfacial reaction (forming brittle phases and micro-crack) in the interface accelerates the failure of the composite. Depositing the inert coating on the Nb fiber surface could reduce and even prevent the interfacial reaction, improving the interfacial structure between Nb fiber and TiAl matrix. In this work, an efficient coating technology, cathodic plasma electrolytic deposition (CPED), was utilized to deposit Al2O3 coating on the Nb fiber surface, which successfully prevented the brittle phases formation at the interface between Nb fibers and TiAl matrix. The reliable and simple interface composed of Nb/Al2O3/TiAl was prepared through the careful adjustment of CPED parameters. The high-strength interface ameliorated the stress distribution, especially increasing the stress borne of Nb fibers by 40 % during the loading process. As a result, the optimized interface avoided premature cracking in interfacial region at initial loading stage and promoted the crack deflection and bifurcation at the overall deformation. Finally, the fracture toughness of the composite after interfacial optimization is increased by 30 % than that of without coating and 70 % than that of TiAl matrix. The above findings validate the feasibility of CPED technology in regulating the interface structure of composite materials, and provide a new method for interface structure design.
KW - CPED coating
KW - Finite element simulation
KW - Fracture toughness
KW - Interfacial optimization
KW - Nb/TiAl composite
UR - http://www.scopus.com/inward/record.url?scp=85182893081&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2023.145967
DO - 10.1016/j.msea.2023.145967
M3 - 文章
AN - SCOPUS:85182893081
SN - 0921-5093
VL - 892
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 145967
ER -