Novel Al-X alloys with improved hardness
| Autor: | Sanjeev K. Nayak, Venkat K. Vedula, Cain J. Hung, Sonia Tulyani, Seok Woo Lee, S. Pamir Alpay, Colette Fennessy, Rainer J. Hebert, Yu Sun |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Additive manufacturing Scanning electron microscope chemistry.chemical_element 02 engineering and technology Alloy development 010402 general chemistry 01 natural sciences lcsh:TA401-492 General Materials Science Composite material Mechanical Engineering Nanoindentation 021001 nanoscience & nanotechnology Microstructure 0104 chemical sciences Cerium Solid solution strengthening Glazing chemistry Mechanics of Materials Density functional theory lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Cobalt Aluminum Solid solution |
| Zdroj: | Materials & Design, Vol 192, Iss, Pp 108699-(2020) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2020.108699 |
| Popis: | In this study, our goal is to design solid solution strengthened aluminum alloys for manufacturing technologies that involve high cooling rates. This investigation starts with an analysis of solid solution strengthening using first principles calculations to determine elastic property changes and local lattice distortions from the introduction of different elements into a host aluminum lattice. These results, coupled with both equilibrium and non-equilibrium solubility data, leads to the selection of cerium and cobalt as the primary candidate alloying elements. Alloys of Al Ce and Al Co at concentrations of 0.5, 1.0, and 3.0 at. % are then synthesized and subjected to laser glazing to produce non-equilibrium microstructures. The microstructure and solid solution characteristics are determined using a combination of scanning electron microscopy and transmission electron microscopy. Furthermore, nanoindentation is used to measure the hardness showing that both candidate systems harden significantly after glazing. In addition, Al-1.0Co at. % achieves a hardness comparable to Al6061-T6. These results conclusively show that cerium and cobalt are promising elements in the next generation aluminum alloys which make use of non-equilibrium processing conditions such as additive manufacturing. |
| Databáze: | OpenAIRE |
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