TY - JOUR
T1 - Investigation on the composite effect of Zr and Cr on oxidation behavior and fracture toughness of Nb-Ti-Si-based alloys manufactured by directed energy deposition
AU - Li, Yunlong
AU - Lin, Xin
AU - Zhao, Zhanyong
AU - Yan, Wentao
AU - Yu, Jun
AU - Bai, Peikang
N1 - Publisher Copyright:
© 2024 Elsevier Inc.
PY - 2024/8
Y1 - 2024/8
N2 - Nb-Ti-Si-based in-situ composites are expected to be very promising materials for high-temperature structures seen in cutting-edge engines. However, the subpar fracture toughness and poor oxidation resistance severely limit their engineering application. To customize the microstructure and performance of directed energy deposition (DED) Nb-Ti-Si-based in-situ composite, it is important to comprehend the impact of alloying element. The present study examines the composite effect of Zr and Cr on room-temperature fracture toughness and high-temperature (1250 °C) oxidation behavior of Nb-23Ti-14Si-based in-situ composites produced by DED. With the co-alloying of Zr and Cr, (γ, α)-Nb5Si3 and Cr2Nb phases are formed in the DED-built Nb-23Ti-14Si-xZr-yCr (x = 3-6 at.%Zr, y = 5-10 at.%) alloys. The formation mechanisms of the oxide scales on Nb-23Ti-14Si-based alloys during the oxidation process have been discussed. With the co-alloying of 6 at.%Zr + 12 at.%Cr, it presents the best oxidation resistance, and the weight gain at 1250 °C for 20 h has decreased to 34.67 mg/cm2. An enhancement in fracture toughness (KQ) to 14.46 MPa·m1/2 was achieved by alloying with 6 at.%Zr + 5 at.%Cr.
AB - Nb-Ti-Si-based in-situ composites are expected to be very promising materials for high-temperature structures seen in cutting-edge engines. However, the subpar fracture toughness and poor oxidation resistance severely limit their engineering application. To customize the microstructure and performance of directed energy deposition (DED) Nb-Ti-Si-based in-situ composite, it is important to comprehend the impact of alloying element. The present study examines the composite effect of Zr and Cr on room-temperature fracture toughness and high-temperature (1250 °C) oxidation behavior of Nb-23Ti-14Si-based in-situ composites produced by DED. With the co-alloying of Zr and Cr, (γ, α)-Nb5Si3 and Cr2Nb phases are formed in the DED-built Nb-23Ti-14Si-xZr-yCr (x = 3-6 at.%Zr, y = 5-10 at.%) alloys. The formation mechanisms of the oxide scales on Nb-23Ti-14Si-based alloys during the oxidation process have been discussed. With the co-alloying of 6 at.%Zr + 12 at.%Cr, it presents the best oxidation resistance, and the weight gain at 1250 °C for 20 h has decreased to 34.67 mg/cm2. An enhancement in fracture toughness (KQ) to 14.46 MPa·m1/2 was achieved by alloying with 6 at.%Zr + 5 at.%Cr.
KW - Alloying element
KW - Directed energy deposition
KW - High-temperature oxidation resistance
KW - Nb-Ti-Si-based in-situ composite
KW - Room-temperature fracture toughness
UR - http://www.scopus.com/inward/record.url?scp=85196660017&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2024.114078
DO - 10.1016/j.matchar.2024.114078
M3 - 文章
AN - SCOPUS:85196660017
SN - 1044-5803
VL - 214
JO - Materials Characterization
JF - Materials Characterization
M1 - 114078
ER -