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Design and fabrication of W-Mo-Ti-TiAl-Al system functionally graded material

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Abstract

To obtain a kind of functionally graded material (FGM) with a density gradient, the W-Mo-Ti-TiAl-Al system graded material was designed, and the powder metallurgy method was chosen for its fabrication. The sintering of W, W-Mo, and Mo-Ti alloys at low temperature was studied, and then the approximately wholly dense W-Mo-Ti-TiAl system FGM was achieved by one-step sintering at 1473 K for 1 hour under a pressure of 30 MPa. It was found that through sintering at 1473 K, mainly the mechanical mixtures of W and Mo were formed in W-Mo alloys. In Mo-Ti alloys, the newly designed Fe-Al sintering aids not only have an important effect on the densification of the alloys, but also contribute to the formation of the (Mo, Ti) solid solution. However, the solid-solution reaction that occurred in Mo-Ti alloys was still insufficient. During the sintering of Ti + TiAl, the chemical reaction of Ti + TiAl → AlTi2 was induced within the sintered body. The W-Mo-Ti-TiAl-Al system FGM was finally fabricated by joining of the TiAl side of the sintered W-Mo-Ti-TiAl system FGM to metal Al with an Al-based brazing filler metal, and its density changed quasi-continuously within the large range from 17.15 to 2.70 g/cm3.

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Author notes

  1. Huaping Xiong

    Present address: the Welding and Forging Lab, Beijing Institute of Aeronautical Materials, 100095, Beijing, People’s Republic of China

  2. Lianmeng Zhang

    Present address: the Institute for Materials Research, Tohoku University, 980-77, Sendai, Japan

Authors and Affiliations

  1. the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, People’s Republic of China

    Huaping Xiong & Runzhang Yuan

  2. the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China

    Lianmeng Zhang

  3. the Institute for Materials Research, Tohoku University, 980-77, Sendai, Japan

    Lidong Chen & Toshio Hirai

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  1. Huaping Xiong
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  2. Lianmeng Zhang
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  4. Toshio Hirai
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  5. Runzhang Yuan
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Xiong, H., Zhang, L., Chen, L. et al. Design and fabrication of W-Mo-Ti-TiAl-Al system functionally graded material. Metall Mater Trans A 31, 2369–2376 (2000). https://doi.org/10.1007/s11661-000-0152-9

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  • DOI: https://doi.org/10.1007/s11661-000-0152-9

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