Abstract
In this work, we investigated the creep behavior of a SLM-printed Ti2AlNb alloy and systematically examined the corresponding microstructural features using multi-scale characterization methods. A single β-phase matrix is produced in the alloy due to the extremely fast solidification process. A new O phase transformation is triggered by the applied external stress following the crystallographic relation of (101) B2//(001) O, compared with the aged counterpart in which only the conventional β-to-O phase transformation with a (110) B2//(020) O relation occurs. This phase transformation contributes to improving the creep resistance of printed specimen test applied with creep stress of 150 MPa at 923 K, suggesting a final steady strain rate of ∼5 × 10–8/s. This work further elucidates the mechanisms of the microstructural evolution of SLM-printed Ti2AlNb-based alloys on creep and offers valuable insights for the future development of high creep-resistance alloys.
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