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

Yunlong Li, Xin Lin, Zhanyong Zhao, Wentao Yan, Jun Yu, Peikang Bai

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2 引用 (Scopus)

摘要

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.

源语言英语
文章编号114078
期刊Materials Characterization
214
DOI
出版状态已出版 - 8月 2024

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