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Reaction Scheme and Liquidus Surface of the Ternary System Aluminum-Chromium-Titanium

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Abstract

The constitution of the ternary system Al-Cr-Ti is investigated over the entire composition range using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), differential thermal analysis (DTA) up to 1500 °C, and metallography. Solid-state phase equilibria at 900 °C are determined for alloys containing ≤75 at. pct aluminum and at 600 °C for alloys containing >75 at. pct Al. A reaction scheme linking these solid-state equilibria with the liquidus surface is presented. The liquidus surface for ≤50 at. pct aluminum is dominated by the primary crystallization field of bcc β(Ti,Cr,Al). In the region >50 at. pct Al, the ternary L12-type phase τ forms in a peritectic reaction p max at 1393 °C from L + TiAl. Furthermore, with the addition of chromium, the binary peritectic L + α(Ti,Al) = TiAl changes into an eutectic L = α(Ti,Al) + TiAl. This eutectic trough descends monotonously through a series of transition reactions and ternary peritectics to end in the binary eutectic L = Cr7Al45 + (Al).

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Acknowledgments

This work was financially supported, in part, by the Austrian Science Foundation (Grant Nos. P12843 and P12113) and the Scientific-Technological Cooperation between Austria and the People’s Republic of China (ÖAD Grant No. WTZ VII.B.9).

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Authors and Affiliations

  1. State Key Lab for Powder Metallurgy, Central South University, 410083, Changsha, Hunan, People’s Republic of China

    Hailin Chen (Graduate Student) & Yong Du (University Professor)

  2. Innovative Materials Group, Universität Wien, 1090, Wien, Austria

    Franz Weitzer (Assistant Professor) & Julius C. Schuster (University Professor)

  3. CEST–Center of Electrochemical Surface Technology, 2700, Wr. Neustadt, Austria

    Nataliya Krendelsberger (Senior Research Fellow)

Authors
  1. Hailin Chen
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  2. Franz Weitzer
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  3. Nataliya Krendelsberger
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  4. Yong Du
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  5. Julius C. Schuster
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Corresponding author

Correspondence to Julius C. Schuster.

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Manuscript submitted February 6, 2009.

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Chen, H., Weitzer, F., Krendelsberger, N. et al. Reaction Scheme and Liquidus Surface of the Ternary System Aluminum-Chromium-Titanium. Metall Mater Trans A 40, 2980–2986 (2009). https://doi.org/10.1007/s11661-009-0014-z

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