scholarly journals Characterization of segregation in nickel and titanium aluminides

1997 ◽  
Author(s):  
M.K. Miller ◽  
D.J. Larson ◽  
K.F. Russell
Keyword(s):  
Titanium Aluminides

Microstructural Characterization of α2 + γ Titanium Aluminides

1997 ◽  
Vol 3 (S2) ◽  
pp. 701-702
Author(s):  
D. J. Larson ◽  
M. K. Miller
Keyword(s):  
Titanium Aluminides ◽  
Base Alloy ◽  
Significant Proportion ◽  
Weight Ratio ◽  
High Strength ◽  
Microstructural Characterization ◽  
Two Phase ◽  
Tial Alloys ◽  
Boron Doped

Two-phase α2+γ TiAl alloys with microalloying additions, Fig. 1, are of interest due to the high strength-to-weight ratio they can provide in automotive and aircraft applications. In boron-doped α2+γTiAl containing Cr, Nb, and W, the B levels were found to be significantly depleted below the nominal alloy content in both the α2 andγ phases. The boron solubilities in the γ and α2 phases were 0.011 ± 0.005 at. % B and 0.003 ± 0.005 at. % B, respectively in Ti-47% Al-2% Cr-1.8% Nb-0.2% W-0.15 % B that was aged for 2 h at 900°C (base alloy). The majority of the B was in a variety of borides including TiB, TiB2 and a Cr-enriched (Ti,Cr)2B precipitate. With the exception of the smaller (< 50 nm thick) Cr-enriched (Ti,Cr)2B precipitates, Fig. 2, most of the borides were larger than ∼100 nm. A significant proportion of the microalloying additions is in these borides, Table 1.

Microstructural Characterization of Silicon Added Titanium Aluminide

2010 ◽  
Vol 442 ◽  
pp. 74-80 ◽  
Author(s):  
Aamer Nusair Khan
Keyword(s):  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Silicon Oxide ◽  
Microstructural Characterization ◽  
Alumina Scale ◽  
Analysis Techniques ◽  
Automotive Engines ◽  
The Past ◽  
Oxidation Properties

Titanium aluminides intermetallic compounds have received great attention during the past decade, since they have the potential, in aircraft and automotive engines, to replace the high density Ni-base superalloys However, these intermetallics possess poor oxidation properties at high temperatures. Previous studies showed that protective alumina scale formation on γ-TiAl can be obtained by small additions (around 2 at.%) of Ag. In the present study, a number of cast Ti–Al–Si alloys were investigated in relation to transient oxide formation in air at 1300°C. After various oxidation times the oxide composition, microstructure and morphology were studied by combining a number of analysis techniques. The TiAl–Si alloys appear to form Al Ti and Si oxides. However, the formation of silicon oxide at the interface of base metal and scale slows down the oxidation rate significantly.

scholarly journals Characterization of In-Situ Alloyed and Additively Manufactured Titanium Aluminides

2014 ◽  
Vol 45 (6) ◽  
pp. 2299-2303 ◽  
Author(s):  
Yan Ma ◽  
Dominic Cuiuri ◽  
Nicholas Hoye ◽  
Huijun Li ◽  
Zengxi Pan
Keyword(s):  
Titanium Aluminides

Multiscale Approach to Texture-Microstructure Coupling

2006 ◽  
Vol 509 ◽  
pp. 1-10
Author(s):  
Richard Penelle ◽  
Thierry Baudin
Keyword(s):  
Titanium Aluminides ◽  
Processing Route ◽  
Multiscale Approach ◽  
Electron Backscattered Diffraction ◽  
Local Texture ◽  
Transmission Electron ◽  
Ni Alloy ◽  
Complementary Techniques

Materials exhibit microstructures and textures that influence their use and properties. Xray and neutron diffraction allow characterization of the bulk texture, whereas Electron Backscattered Diffraction (EBSD) permits determination of the local texture. In many cases Transmission Electron Microscopy (TEM) remains necessary to characterize the substructure and the local texture for highly deformed materials. Depending on the scale considered, all these complementary techniques permit the coupling of texture and microstructure so that it becomes possible to control microstructure and its evolution during a processing route. Some examples in titanium aluminides, (α + β) titanium alloys and an Fe-Ni alloy will illustrate this challenge.

Chemical Synthesis and Characterization of Nanostructured Titanium Aluminide

1994 ◽  
Vol 351 ◽  
Author(s):  
S.T. Schwab ◽  
P.P. Paul ◽  
Y-M. Pan
Keyword(s):  
Heat Treatment ◽  
Chemical Analysis ◽  
Chemical Synthesis ◽  
Titanium Aluminide ◽  
Titanium Aluminides ◽  
Synthesis And Characterization ◽  
Nanostructured Titanium ◽  
Nanosize Particles

ABSTRACTAlthough plagued by a lack of ductility, titanium aluminides are among the most promising intermetallics under development. Significant improvements in ductility may be obtained from nanostructured intermetallics. Nanosize particles of TiAl3 have been prepared by heat-treatment of chemically synthesized precursor (compound 1). Nanosized TiAl3 has been characterized by chemical analysis, XRD, EDS, NMR, and HREM.

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