Results 241 to 250 of about 11,738 (294)

The ductility of cast TiAl-based alloys

MRS Proceedings, 2011
ABSTRACTThe factors which influence the ductility of cast samples of TiAl-based alloys are briefly reviewed with emphasis on alloys where microstructural refinement has been used in an attempt to improve ductility. The grain size in cast samples of different TiAl-based alloys can be refined either by high additions of about 1at% boron, or by lower ...
M H Loretto, Z. Wu, M Q Chu, D Hu
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Permanent Mold Suction Casting for TiAl Based Alloys

Advanced Materials Research, 2009
A novel precision casting technique for TiAl based alloy was described in this work, called the permanent mold suction casting technology，and the blades of Ti-47Al-2Si、Ti-47Al-2W-0.5Si、Ti-47Al-2W-0.5Si -0.5B were get by this technology. The structures of these blades were studied.
Yan Qing Su, Xi Cong Ye, Jing Jie Guo, Liang Shun Luo, L. Wang, H.Z. Fu   +5 more
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Long-term creep behaviour of cast TiAl-Ta alloy

Intermetallics, 2018
Abstract The long-term creep behaviour of the cast Ti-44.4Al-8.1Ta (at.%) alloy with an initial γ-TiAl(L10)+α2-Ti3Al(D019) microstructure was investigated at 700 °C. The alloy shows a remarkable creep resistance. The minimum creep rate is measured to be as low as 1.47 × 10−10 s−1 and total deformation is only 2.5% after an interrupted 30000 h creep ...
J. Lapin, T. Pelachová, M. Dománková
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Alloy development and shell mould casting of gamma TiAl

Journal of Materials Processing Technology, 2003
Recent 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, 2004
Microstructure 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, Wang, J. N., Yang, Jie, Wang, Yong   +3 more
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Creep strength of centrifugally cast Al-rich TiAl alloys

Materials Science and Engineering: A, 2009
Abstract 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., Heilmaier, M., Saage, H., Paninski, M., Schmitz, G. J., Drevermann, A., Palm, M., Stein, F., Engberding, N., Kelm, K., Irsen, S.   +10 more
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Oxide Dispersion in Direct-Cast Gamma TiAl-Based Alloy

MRS Proceedings, 1994
AbstractThe 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, 2015
By 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, Xiao Xia Wu, Hui Chen Yu, Hao Fang Sun, Ze Hui Jiao   +4 more
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Ductility Improvement of Direct-Cast Gamma TiAl-Based Alloy Sheet

MRS Proceedings, 1996
ABSTRACTFor 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, 2001
The 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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