Simultaneously improving strength and ductility of laser-powder-bed-fused Al–Zn–Mg–Cu–Ti alloys by controlling phase structure of Al3Ti
Titanium (Ti) addition enabled the laser-powder-bed-fusion (LPBF) fabrication of 7075 (Al–Zn–Mg–Cu) alloys under the heterogeneous nucleation effect of in-situ Al3Ti phase. However, brittle D022 structured Al3Ti easily formed during LPBF, leading to unpleasant tensile properties. In this study, supp...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-03-01
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| Series: | Materials Research Letters |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21663831.2024.2441334 |
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| Summary: | Titanium (Ti) addition enabled the laser-powder-bed-fusion (LPBF) fabrication of 7075 (Al–Zn–Mg–Cu) alloys under the heterogeneous nucleation effect of in-situ Al3Ti phase. However, brittle D022 structured Al3Ti easily formed during LPBF, leading to unpleasant tensile properties. In this study, suppression of D022–Al3Ti was explored by adding a small amount of carbon (C) in LPBF Al–Zn–Mg–Cu–Ti alloys. It was found that C addition resulted in 118% improvement in elongation and simultaneous 23% improvement in ultimate tensile strength. The effect of C on the L12 → D022 transformation was studied by aberration-corrected transmission electron microscope and density functional theory. |
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| ISSN: | 2166-3831 |