Design and fabrication of W-Mo-Ti-TiAl-Al system functionally graded material |
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| Authors: | Huaping Xiong Lianmeng Zhang Lidong Chen Toshio Hirai Runzhang Yuan |
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| Affiliation: | (1) the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People’s Republic of China;(2) Present address: the Welding and Forging Lab, Beijing Institute of Aeronautical Materials, 100095 Beijing, People’s Republic of China;(3) the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China;(4) Present address: the Institute for Materials Research, Tohoku University, 980-77 Sendai, Japan |
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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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