Abstract
The deformation and fracture behavior of the titanium aluminide alloy Ti-24Al-11Nb (atomic percent) have been investigated over the temperature range of 27 °C to 500 °C. The alloy, which was examined in the “basket-weave” microstructural condition, deforms in a nonuniform manner and is characterized by plastically anisotropic flow on the scale of the prior beta grain size. As a consequence, locally severe strain incompatibilities develop near prior beta grain boundaries and contribute to microcrack initiation, which appears to be caused by a slip intersection process. The beta phase influences microcrack initiation as well as subsequent crack propagatio in both direct and indirect manners.
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Lukasak, D.A., Koss, D.A. The flow and fracture of a Ti3Al-Nb alloy. Metall Trans A 21, 135–143 (1990). https://doi.org/10.1007/BF02656431
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DOI: https://doi.org/10.1007/BF02656431