Dendritic Growth of Rapid-Solidified Eutectic High-Entropy Alloy
| Autor: | Andrew M. Mullis, Peng Yu Hou, Lei Gang Cao, Ahmed Nassar |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Alloy 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Mechanics of Materials 0103 physical sciences engineering General Materials Science 0210 nano-technology Eutectic system |
| Zdroj: | Materials Science Forum. 1035:46-50 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.1035.46 |
| Popis: | Mould casting and drop-tube techniques were used to solidify a AlCoCrFeNi2.1 eutectic high-entropy alloy under conditions of high cooling rate. The samples obtained from two different methods present the same phase constituent, FCC and B2 phases. During mould casting experiments the alloy almost solidified into the eutectic structure consisting of lamellar and anomalous morphology, with a tiny fraction of cellular and dendrite morphology being observed at certain sites of the sample surface due to the corresponding high cooling rate. Instead, during drop-tube experiments a typical, coarse dendrite structure of FCC single phase was formed across the entire 106-150 μm particle. The cellular structure can also be formed directly from the melt. The rest region solidified into the general eutectic morphology as was observed in the casting rods. The results clearly indicate the transition from coupled eutectic growth to single-phase dendrite growth with increasing departures from equilibrium for the multi-component AlCoCrFeNi2.1 eutectic high-entropy alloy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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