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Licensed Unlicensed Requires Authentication Published by De Gruyter November 30, 2021

Phase Equilibria in the Ti-rich Corner of the Ti –Si –Al System

Marina Bulanova, Ludmila Tretyachenko and Marina Golovkova

Abstract

By the methods of differential thermal, X-ray, microscopy and electron microprobe analysis phase equilibria in the Tirich corner of the Ti–Si –Al system were studied. Projections of solidus and liquidus surfaces as well as an isothermal section at 1300 °C were constructed. It was shown that at the solidus and 1300 °C Ti5 (Si,Al)3 (Z) phase coexists with all of the Ti– Al-based phases, resulting in wide two-phase (β + Z, α + Z, γ + Z) and narrow three-phase (α + β + Z, α + γ + Z) regions. The last two ones result from invariant four-phase peritectic and eutectic reactions, respectively. Coordinates of peritectic (U1) and eutectic (E) points were determined to be: U1 – 1420 °C, ∼49Ti–4Si– 47Al; E– 1415 °C, 48Ti –4Si– 48Al. The solidus surface has its temperature maximum at 1545 °C corresponding to the invariant pseudobinary eutectic L↔β + Z with eutectic point at 65Ti – 8Si– 27Al. The isopleth at 10 at.% Si is given. The shape of the Ti5 (Si,Al)3 homogeneity range is discussed.


Marina Bulanova, Ludmiora Tretyachenko, Marina Golovka I.N. Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine, 3 Krzyanovsky Str., Kiev, 252180, Ukraine

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Received: 1996-04-24
Published Online: 2021-11-30

© 1997 Carl Hanser Verlag, München