Results 251 to 260 of about 11,738 (294)
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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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Omega phase in as-cast high-Nb-containing TiAl alloy
Scripta Materialia, 2013The omega phase in as-cast high-Nb-containing TiAl alloy exhibits particles with sizes on the nano- or microscale within the B2 matrix. Omega particles are transformed from the B2 phase by heterogeneous nucleation on the B2/γ boundaries or homogeneous nucleation within the B2 phase. After annealing at 900 °C, the omega particles disappear and transform
L. Song +4 more
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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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The Study on TiAl Based Alloy Blade Casting Structure by Bottom Pouring Vacuum Casting
Advanced Materials Research, 2012In this paper, the bottom pouring vacuum suction casting is used, and the TiAl-based alloy blade with a certain flexivity, the brim thickness 1.5mm, and the blade Falcon with high 8mm, width 10mm, length 27mm was obtained. The structures of this blade are studied.
Xi Cong Ye +4 more
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Fracture behaviour of cast TiAl based intermetallic alloys [PDF]
, 2013 The γ -TiAl based intermetallic alloys have received considerable attention as candidate materials for high-temperature aerospace applications, power generation and automotive industry, with the efforts being directed toward the replacement of Ni-based superalloys in many interesting applications.
BROTZU, Andrea +2 more
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Influence of oxygen on solidification behaviour of cast TiAl-based alloys
Intermetallics, 2007Abstract The influence of oxygen on solidification behaviour of cast TiAl-based alloys containing 40–48 at.% of Al was studied. Twelve alloys with fixed Ti:Al ratios ranging from 1.08 to 1.5 and oxygen content of 0.1, 0.8 and 1.5 at.% were prepared by induction melting and casting in a cold crucible under protective atmosphere.
J. Zollinger +3 more
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Interactions between TiAl alloys and yttria refractory material in casting process
Journal of Materials Processing Technology, 2010Abstract In this work, U-shaped yttria ceramic crucibles have been prepared to melt Ti–47Al (at.%) alloy in a vacuum induction furnace, in order to simulate the worst practical situation with respect to the interactions between TiAl alloy and yttria refractory material.
Cui Renjie +3 more
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Superplastic behavior of a TiAl alloy in its as-cast state
Materials Research Bulletin, 2002Abstract Superplastic behavior of a TiAl alloy was investigated in a temperature range between 800 and 1000°C and at a strain rate of 1×10 −4 s −1 . The results show that the present alloy possesses very good superplasticity even in its as-cast state. A tensile elongation of 628% was obtained at 850°C.
Bin Zhang, J.N Wang, Jie Yang
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Inhomogeneous microstructure in highly alloyed cast TiAl-based alloys, caused by microsegregation
Scripta Materialia, 2005Abstract This paper describes the segregation behaviour of two TiAl alloys containing refractory metal additions. This includes the coring of the refractory metal additions in the β dendrites and the formation of large peritectic α p in the interdendritic liquids.
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