Calculated ternary diagram of Ti–Al–Si system
Source: Materials Science and Technology, Volume 16, Number 4, April 2000 , pp. 372-381(10)
Publisher: Maney Publishing
Abstract:The phase equilibria between β (body centred cubic, bcc), α (hexagonal closed packed, hcp), Ti3 Al–α 2 (hcp), and Ti5 Si3 (hcp) in the Ti–Al–Si system have been investigated in the temperature range 700–1200°C. Isothermal sections of the ternary phase diagram have been assessed employing thermodynamic software, which uses the compound energy model to describe the phases mathematically. Available experimental phase equilibria results on the Ti–Al–Si system were used to calculate missing binary and ternary interaction parameters and assess isothermal phase diagrams. Extrapolations in the resulting tie triangles indicate the existence of three eutectoid reactions in the Ti rich corner of the ternary diagram: β → α + Ti5 Si3 , α → α 2 + Ti5 Si3 , and β → α 2 + Ti5 Si3 . Additionally, extrapolations in the β + α2 + α tie triangle observed at 1100°C indicate that two possibilities arise to represent a peritectoid reaction involving α, β, and α 2phases: β + α2 → α and β + α → α2 , depending on the alloy composition and the effect of temperature on the solubitlity of Si in the α phase.
Document Type: Regular Paper
Publication date: 2000-04-01
Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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