Abstract
Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.
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