High-throughput synthesis of Mo-Nb-Ta-W high-entropy alloys via additive manufacturing
| Autor: | Dan J. Thoma, Adrien Couet, Michael Niezgoda, Calvin Parkin, Kumar Sridharan, Michael Moorehead, K.M. Bertsch, Chuan Zhang, Mohamed Elbakhshwan |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering High entropy alloys Alloy Context (language use) 02 engineering and technology Crystal structure engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Characterization (materials science) Chemical engineering Mechanics of Materials engineering lcsh:TA401-492 General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology CALPHAD Phase diagram |
| Zdroj: | Materials & Design, Vol 187, Iss, Pp-(2020) |
| ISSN: | 0264-1275 |
| Popis: | High-entropy alloys (HEAs) are a class of alloys that can exhibit promising properties including enhanced irradiation resistance, high-temperature strength, and corrosion resistance. However, they exist in a relatively unexplored region of quasi-limitless composition space. Thus, to enable the development of promising compositionally complex alloys, such as HEAs, high-throughput methods are needed. Such high-throughput capabilities are developed and presented in this work. In situ alloying through additive manufacturing was employed to produce arrays of different HEA compositions. Sample arrays were then characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), all while remaining on the build plate. The top surface of each sample was compositionally homogeneous, as determined by EDS, and each sample exhibited a single-phase, disordered crystal structure, as determined by XRD. CALculation of PHAse Diagrams (CALPHAD) modeling was used to determine the equilibrium phases of each HEA composition at lower temperatures, the results of which were compared with XRD results. Implications of high-throughput synthesis techniques and the coupling of high-throughput characterization and modeling techniques are discussed in the context of alloy development. Keywords: High-entropy alloy, MoNbTaW, Additive manufacturing, High throughput, In situ alloying |
| Databáze: | OpenAIRE |
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