TY - JOUR
T1 - Microstructures and mechanical properties of β-NiAlHf coated single crystal superalloy
AU - Gong, Xueyuan
AU - Yang, Yonghong
AU - Ma, Yue
AU - Peng, Hui
AU - Guo, Hongbo
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/9/15
Y1 - 2016/9/15
N2 - A β-NiAlHf coating was deposited by electron beam physical vapor deposition (EB-PVD) onto single crystal (SC) superalloy substrate. The microstructure evolution of the NiAlHf coating after annealing at 1100 °C was investigated and the mechanical properties of the coated substrate were also concerned. The crack initiation and propagation behavior of the coated substrate during three-point bending was studied. An interdiffusion zone (IDZ) was formed between the coating and substrate and the hardness of the precipitates in the IDZ layer was relatively higher than that of the coating and the substrate. The annealed specimen during bending revealed different crack initiation and propagation behavior from the uncoated specimen. Cracks were initiated at the carbides in the uncoated alloy. For the coated specimen after 10 h annealing, cracks were initiated mostly in the IDZ layer, due to the presence of μ-TCP phases. For the coated specimen after 50 h annealing, cracks were generated at the top of triangle-shaped γ′-Ni3Al phases where stress concentration occurred, which finally propagated into the substrate, leading to the reduction of the alloy in strength.
AB - A β-NiAlHf coating was deposited by electron beam physical vapor deposition (EB-PVD) onto single crystal (SC) superalloy substrate. The microstructure evolution of the NiAlHf coating after annealing at 1100 °C was investigated and the mechanical properties of the coated substrate were also concerned. The crack initiation and propagation behavior of the coated substrate during three-point bending was studied. An interdiffusion zone (IDZ) was formed between the coating and substrate and the hardness of the precipitates in the IDZ layer was relatively higher than that of the coating and the substrate. The annealed specimen during bending revealed different crack initiation and propagation behavior from the uncoated specimen. Cracks were initiated at the carbides in the uncoated alloy. For the coated specimen after 10 h annealing, cracks were initiated mostly in the IDZ layer, due to the presence of μ-TCP phases. For the coated specimen after 50 h annealing, cracks were generated at the top of triangle-shaped γ′-Ni3Al phases where stress concentration occurred, which finally propagated into the substrate, leading to the reduction of the alloy in strength.
KW - A. Electron microscopy
KW - A. Hardness measurement
KW - B. Nickel based superalloys
KW - D. Fracture
KW - D. Interfaces
UR - https://www.scopus.com/pages/publications/84978654955
U2 - 10.1016/j.msea.2016.07.067
DO - 10.1016/j.msea.2016.07.067
M3 - 文章
AN - SCOPUS:84978654955
SN - 0921-5093
VL - 673
SP - 39
EP - 46
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -