A metal–metal powder formulation approach for laser additive manufacturing of difficult-to-print high-strength aluminum alloys
| Autor: | Charles Browning, Li Cao, Lewis Forman, Fred Herman, Robyn L. Bradford, Donald A. Klosterman |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Alloy chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences chemistry Mechanics of Materials Aluminium Ultimate tensile strength engineering Metal powder General Materials Science Laser power scaling Composite material 0210 nano-technology Porosity Elastic modulus |
| Zdroj: | Materials Letters. 300:130113 |
| ISSN: | 0167-577X |
| Popis: | It is well known that many high-strength aluminum alloys are difficult to process with laser powder bed fusion (LPBF) additive manufacturing because they are highly susceptible to solidification cracking. To address this issue, a metal–metal powder formulation approach was developed that allows for LPBF of previously difficult-to-print, high-performance Al alloys such as aluminum 6061 (Al6061). For the first time, a novel crack-free Al6061/AlSi10Mg alloy has been fabricated with this hybrid powder technique using relatively low laser power and no heat treatment. Compared to unmodified LPBF Al6061, the as-built hybrid Al50-50 microstructure (50 vol.% Al6061 + 50 vol.% AlSi10Mg) was crack free and overall porosity was reduced by 57%. In addition, Al50-50 exhibited significantly higher average elastic modulus, yield strength, ultimate strength, fracture strain, and hardness by about 148%, 288%, 469%, 943% and 55%, respectively. These results clearly indicate that metal–metal powder formulation is a promising method to create customized, laser-printable blends for difficult-to-process, high-performance aluminum alloys. |
| Databáze: | OpenAIRE |
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