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| Naji, M. |
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Ibrahim, Peter
University of Birmingham
in Cooperation with on an Cooperation-Score of 37%
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Publications (3/3 displayed)
- 2024Laser powder bed fusion of a β titanium alloy: Microstructural development, post-processing, and mechanical behaviourcitations
- 2023On the origin of cracking in laser powder bed fusion processed LaCe(Fe,Mn,Si)13, and the impact of post-processingcitations
- 2022Effect of Oxygen Diffusion During the Post-Processing Of Ti6Al4V Lattice Structures Fabricated by the SLM Processcitations
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article
Laser powder bed fusion of a β titanium alloy: Microstructural development, post-processing, and mechanical behaviour
Abstract
β-Titanium alloys demonstrate unique properties, especially their low elastic modulus, good balance of strength and ductility, and strong heat treatment response. In this study, pre-alloyed powder of a β-Ti-alloy Ti–34Nb–13Ta–5Zr-0.3O (TNTZO) was processed using Laser Powder Bed Fusion (LPBF). Dense builds that demonstrate a full β microstructure with limited texture were achieved following process optimisation, with an elastic modulus of 56.5 GPa, tensile strength of 756 MPa, elongation-to-failure of 20 %, and recoverable strain of 1.3 %. Due to the high oxygen content, the β→α′′ deformation induced transformation was supressed, which resulted in a typical elastic-plastic stress-strain behaviour unlike the double-yielding behaviour typically experienced in superelastic Ti-alloys. The alloy was particularly sensitive to ageing heat treatments that resulted in needle α-precipitation, with tensile strengths exceeding 950 MPa, elastic modulus of ∼80 GPa, and recoverable strain of 1.5 %, yet at the expense of a reduced elongation-to-failure of 9 %. Transmission electron microscopy and electron backscattered diffraction investigations revealed the deformation mechanism was slip-dominated with no trace of twinning or stress induced phase transformation.