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Alloy development and shell mould casting of gamma TiAl
Journal of Materials Processing Technology, 2003Recent studies of the properties and shell mould casting of gamma TiAl-based alloys in the authors' laboratory are summarised in this paper. As-cast and heat treated ternary alloys containing 44.2-47 at.% Al and 0-8 at.% Nb were investigated for oxidation resistance at 900 degreesC and crack propagation behaviour during cyclic thermal fatigue test ...
R Yang, Y.Y Cui, L.M Dong, Q Jia
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Microstructure refinement of cast TiAl alloys by β solidification
Scripta Materialia, 2004Microstructure refinement of TiAl alloys is realized by introducing β solidification in this paper. The obtained fine-grained cast microstructures can be optimized to be fine-grained fully lamellar structures merely by a one-step heat treatment. The present study may provide an alternative and cost-effective approach for microstructure refinement of ...
Jin, Yonggang +3 more
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Creep strength of centrifugally cast Al-rich TiAl alloys
Materials Science and Engineering: A, 2009Abstract High-temperature creep of a binary Al 60 Ti 40 (at.%) alloy in the as-cast state and after annealing at 1223 K for 200 h which produced nearly lamellar γ-TiAl + r-Al 2 Ti microstructure was studied utilizing creep compression tests in a temperature range between 1173 and 1323 K in air.
Sturm, D. +10 more
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Oxide Dispersion in Direct-Cast Gamma TiAl-Based Alloy
MRS Proceedings, 1994AbstractThe objective of this study is to evaluate the high temperature behavior of γ TiAl-based alloy sheets containing AI2O3 particles, produced by a combination of vacuum induction melting, use of a CaO crucible, and direct sheet casting, over a wide temperature range. Alumina particles, having a tendency to coagulate during solidification of a TiAl
Toshihiro Hanamura, Keizo Hashimoto
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Microstructures and Creep Behavior of As-Cast TiAl-Nb Alloy
Materials Science Forum, 2015By means of creep properties measurement and microstructure observation, an investigation was carried out to study the creep behaviors of the as-cast TiAl-Nb alloy at temperature near 910 oC. Results showed that the microstructure of as-cast TiAl-Nb alloy consisted of γ/α2 phases with the lamellar feature, and the boundaries with irregular serrated ...
Su Gui Tian +4 more
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Ductility Improvement of Direct-Cast Gamma TiAl-Based Alloy Sheet
MRS Proceedings, 1996ABSTRACTFor improving the room temperature tensile ductility of direct-cast gamma TiAl sheets without affecting their high-temperature strength, direct sheet casting with T1B2 particle dispersion is employed and conducted. The T1B2 addition and rapid cooling results in the formation of a fine equiaxed grain microstructure with an average grain size of ∼
Toshihiro Hanamura, Keizo Hashimoto
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Surface defect tolerance of a cast TiAl alloy in fatigue
Scripta Materialia, 2001The effect of artificially introduced surface defects on the high cycle fatigue behavior of the Ti-47Al-2W-0.5Si alloy has been investigated and correlated with the crack growth behavior ar temperatures of 700°C and 750°C. The results are reported in the form of Kitagawa diagram in which the safe and unsafe zones for crack advance are defined.
Nazmy M, M Staubli, G Onofrio, V Lupinc
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Microstructural refinement in cast TiAl alloys by solid state transformations
Scripta Materialia, 2005Abstract It is shown that a new fine microstructure with significantly improved tensile properties can be generated in massively transformed, quenched and tempered samples of TiAl-based alloys. It is also shown that quench-cracking can be avoided in samples up to at least 20 mm diameter if samples are quenched into molten salt.
X WU, D HU
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Advances in optimisation of mechanical properties in cast TiAl alloys
Intermetallics, 2005Abstract The room temperature tensile properties of a number of cast TiAl-based alloys, which have been grain-refined either by additions of boron or by a new quenching and ageing treatment, have been assessed. It has been found that in the alloys which have been grain-refined by boron addition, the size of the titanium boride particles, which is ...
D. Hu, X. Wu, M.H. Loretto
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Superplastic behavior of a high-Cr TiAl alloy in its cast state
Journal of Alloys and Compounds, 2004AbstractFor Abstract see ChemInform Abstract in Full Text.
Yong Wang, J. N. Wang, Jie Yang
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