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Ikeda, Ayako
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Publications (4/4 displayed)
- 2024Microstructure Optimization of Thermoelectric τ1-Al2Fe3Si3 via Graded Temperature Heat Treatments
- 2023Effect of Solution Heat-Treatment on the Oxidation Resistance of Ni-Base Single-Crystal Superalloycitations
- 2018Effects of Heat Treatment on Unique Layered Microstructure and Tensile Properties of TiAl Fabricated by Electron Beam Meltingcitations
- 2018Microstructure and Fatigue Properties of TiAl with Unique Layered Microstructure Fabricated by Electron Beam Meltingcitations
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article
Effects of Heat Treatment on Unique Layered Microstructure and Tensile Properties of TiAl Fabricated by Electron Beam Melting
Abstract
<jats:p>In the present study, effects of heat treatment on microstructures and tensile properties of the cylindrical bars of Ti-48Al-2Cr-2Nb (at.%) alloy with unique layered microstructure consisting of equiaxed γ grains region (γ band) and duplex-like region fabricated by electron beam melting (EBM) were investigated. We found that it is possible to control width of the γ bands (W<jats:sub>γ</jats:sub>) by heat treatments at 1100°C and 1190°C. The W<jats:sub>γ</jats:sub> increases with decreasing heat treatment temperature. The bars heat-treated at 1190°C exhibit high elongation of 2.9% at room temperature (RT) with maintaining high strength. The RT elongation increases with increasing the W<jats:sub>γ</jats:sub> because of increasing deformable regions. In contrast, the RT elongation of the bars decreases with increasing the W<jats:sub>γ</jats:sub> when W<jats:sub>γ</jats:sub> is very large. This is because the large γ band leads intergranular fracture. These results indicate that there is appropriate width for the γ band to obtain excellent tensile properties at RT.</jats:p>