14.4 Intermetallic materials for structural high temperature applications

Sauthoff, Gerhard

doi:10.1007/10858641_18

Cited by 2 publications

(1 citation statement)

References 111 publications

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“…These are affected by coating compatibility issues associated with differences in the coefficient of thermal expansion of the materials employed (Ti48Al2Cr: a = 9.1 -11.8 N 10 -6 [1/K] (100-700 8C) [6], yttria-stabilized zirconia: a = 11 -13 N 10 -6 [1/K] [7], MCrAlY: a = 13-16 N 10 -6 [1/K] [7]). In order to control or rather lower residual stresses, among other influencing factors sample geometry, substrate pre-treatment, coating thickness and of course the coating materials themselves are expected to be the most prominent factors.…”

Section: Introductionmentioning

confidence: 99%

Improving long term oxidation protection for γ‐TiAl substrates

Bobzin¹,

Schläfer²,

Warda³

et al. 2011

Materialwissenschaft Werkst

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In previous work, a thermal spray multilayer system consisting of Zirconia (ZrO 2 ) and MCrAlY top coat showed promising results regarding the oxidation behavior of the Gamma Titanium Aluminides substrates tested, which encouraged further research activities. Diffusion of substrate material was successfully inhibited by a ceramic Zirconia coating. A building up of a dense and stable oxide layer could be achieved by additional application of an MCrAlY top coat, leading to improved oxidation resistance and thus showing feasibility. In this work the main focus for development was put on enhancing adhesion and lowering residual stresses of the coatings in order to allow long term and cyclic testing without delamination taking place. Being a very brittle material, Gamma Titanium Aluminides require special surface treatment to enable roughening which is crucial for a strong mechanical bond between substrate and coating. Alternatives to conventional grit blasting as a standard preparation method were investigated. These were micro-abrasive blasting and blasting at elevated temperature (L300 -550 8C) to allow a more ductile behavior. The paper will highlight the implications by means of these measures and will also show the present development status of the multilayer system.

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Section: Introductionmentioning

confidence: 99%

Improving long term oxidation protection for γ‐TiAl substrates

Bobzin¹,

Schläfer²,

Warda³

et al. 2011

Materialwissenschaft Werkst

View full text Add to dashboard Cite

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Exploration of phase structure evolution induced by alloying elements in Ti alloys via a chemical-short-range-order cluster model

Jiang

Wang

Dong

et al. 2019

Sci Rep

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The prominent comprehensive properties of solid-solution- and intermetallic-based Ti alloys are derived from their diverse microstructures induced by multi-component alloying, which results in a chemical composition complexity. A cluster-plus-glue-atom model, characterizing the chemical short-range orders, was introduced to explore the relationships among the local atomic distributions of alloying elements in different phase structures of Ti alloys, including α -Ti, β -Ti, ω -Ti, α 2 -Ti 3 Al, γ -TiAl, O- Ti 2 AlNb, and B2-Ti(Al,Nb). Specific cluster structural units, i . e ., cluster formulas, for these phases were determined with the guide of the Friedel oscillation theory for electron-structure stabilization. It is due to the change of cluster structural units that induces the phase transformation, which is attributed to the amounts of primary alloying elements of Al and Nb. The total atom number ( Z ) values in these cluster structural units, calculated by the Fermi vector k F , are all very close to the integer of Z = 16. Furthermore, the composition rules of industrial multi-component Ti alloys based on these phases were generalized in light of the cluster formula approach, which will open up a new route towards designing high-performance Ti alloys with complex compositions.

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14.4 Intermetallic materials for structural high temperature applications

Cited by 2 publications

References 111 publications

Improving long term oxidation protection for γ‐TiAl substrates

Improving long term oxidation protection for γ‐TiAl substrates

Exploration of phase structure evolution induced by alloying elements in Ti alloys via a chemical-short-range-order cluster model

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