Synergistic effects of twin boundary and phase boundary for enhancing ultimate strength and ductility of lamellar TiAl single crystals

Microstructure and mechanical properties of novel TiAl alloys tailored via phase and precipitate morphology

This study investigates the micro/nanostructural features and mechanical responses of a novel TiAl/Ti3Al/Al2O3 cermet fabricated by self-propagation high-temperature synthesis. The microscopic diagnosis was used to examine the material composition, phase distribution, and elemental concentration of the cermet. Three phases were identified in the cermet, including γ-TiAl, α2-TiAl, and Al2O3. The material exhibited ultrafine microstructure with the size of alumina particles between 0.5 µm and 1.5 µm occupying 65 ± 1% areal fraction of the material. Transmission electron microscopy (TEM) was employed to examine the “coral” network of alumina particles with the titanium aluminide matrix, which was believed to be contributing to the failure of the material. Iron/nickel-based nano-precipitates were found through TEM as well, and these were believed to be contributing to the mechanical properties of the material. The rate-dependency on the compressive strength and failure mechanisms were studied by quasi-static and dynamic uniaxial compression, and it was found that the quasi-static and dynamic compressive strengths were 2400 ± 120 MPa and 3370 ± 450 MPa, respectively. The results are compared with those for alumina AD995 to highlight differences in mechanical properties, such as compressive strength and failure strains. These findings serve as the preliminary dataset for material design, manufacturing, and modeling of advanced cermets.

Characterization and mechanical testing on novel (γ + α2) – TiAl/Ti3Al/Al2O3 cermet

Slip transfer across γ-TiAl lamellae in tension

Tensile behavior of γ/α2 interface system in lamellar TiAl alloy via molecular dynamics

Mapping deformation mechanisms in lamellar titanium aluminide

Microalloying is an effective approach to improve the mechanical properties of γ-TiAl intermetallic compound. Knowledge about the site occupancy of the ternary alloying element in the crystal lattice of γ-TiAl is highly demanded in order to understand the physics underlying the alloying effect. Previous first-principle methods-based thermodynamic models for the determination of the site occupancy were based on the point defect gas approximation with the interaction between the point defects neglected. In the present work, we include the point defect interaction energy in the thermodynamic model, which allows us to predict the site occupancy of the ternary alloying element in γ-TiAl beyond the point defect gas approximation. The model is applied to the γ-TiAl–Nb alloy. We show that, at low temperature, the site occupancy of Nb atoms depends on the composition of the alloy: Nb atoms occupy the Al sublattice for the Ti-rich alloy but occupy Ti sublattice for the Al-rich alloy. The fraction of Nb atoms occupying Al sublattice in the Ti-rich alloy decreases drastically, whereas the fraction of Nb atoms on the Ti sublattice in the Al-rich alloy decreases slightly with increasing temperature. At high temperature, Nb atoms occupy dominantly the Ti sublattice for both the Ti-rich and Al-rich alloys. The interaction between the point defects makes the Ti sublattice more favorable for the Nb atoms to occupy.

Site Occupation of Nb in γ-TiAl: Beyond the Point Defect Gas Approximation

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Mapping deformation mechanisms in lamellar titanium aluminide

Site Occupation of Nb in γ-TiAl: Beyond the Point Defect Gas Approximation