scholarly journals Sputtering and characterization of MAX‐phase forming Cr‐Al‐C and Ti‐Al‐C coatings and their application on γ‐based titanium aluminides

2021 ◽  
Author(s):  
Nadine Laska ◽  
Peter-Philipp Bauer ◽  
Oliver Helle ◽  
Frederic Kreps
Keyword(s):  
Titanium Aluminides ◽  
Max Phase

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.

scholarly journals Synthesis of (V2/3Sc1/3)2AlC i-MAX phase and V2−xC MXene scrolls

Nanoscale ◽  
2019 ◽  
Vol 11 (31) ◽  
pp. 14720-14726 ◽  
Author(s):  
Jimmy Thörnberg ◽  
Joseph Halim ◽  
Jun Lu ◽  
Rahele Meshkian ◽  
Justinas Palisaitis ◽  
...  
Keyword(s):  
Max Phase ◽  
Synthesis And Characterization ◽  
Etching Time ◽  
Chemical Ordering

We report the synthesis and characterization of a new laminated i-MAX phase, (V2/3Sc1/3)2AlC, with in-plane chemical ordering between the M-elements. We also produce V2−xC MXene with only 24 h etching time using HF and MXene scrolls using LiF + HCl.

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

Processing and Characterization of Porous Ti2AlC Using Space Holder Technique

2016 ◽  
Vol 704 ◽  
pp. 197-203 ◽  
Author(s):  
Jesus Gonzalez-Julian ◽  
Martin Bram
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Max Phase ◽  
Space Holder ◽  
Porous Ti ◽  
Low Thermal Expansion ◽  
Final Microstructure ◽  
Ammonium Hydrogen ◽  
Oxidation And Corrosion

Ti2AlC is one of the most promising MAX phase materials due to its combination of properties at high temperatures (> 800 °C) such as high strength, good oxidation and corrosion resistances, low thermal expansion, readily machinable, high thermal conductivity and nonsusceptibility to thermal shock. Porous structures based on Ti2AlC are excellent candidates for diverse applications such as heat exchangers and filters, although more systematic studies are required to implement this material. In this work, porous Ti2AlC material was obtained using a low cost and eco-friendly process, the space holder technique. Commercial Ti2AlC powder was mixed with different contents (30, 50 and 70 vol.%) of ammonium hydrogen bicarbonate (NH4HCO3) as space holder. Afterwards, the obtained powder was uniaxially pressed, followed by elimination of space holder by a heat treatment at low temperature. Finally, porous Ti2AlC structures were consolidated at 1350 °C under argon atmosphere. Processing, final microstructure and pore characterization of the consolidated materials are described in detail.

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
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