Precipitation Hardenable High Entropy Alloy for Tooling Applications
| Autor: | Alex Asabre, Ulrike Hecht, Andreas Weisheit, M. B. Wilms, Guillaume Laplanche, V. T. Witusiewicz, Oleg Stryzhyboroda |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2019 |
| Předmět: |
Spinodal
Materials science Annealing (metallurgy) Precipitation (chemistry) Mechanical Engineering Metallurgy Alloy 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness 0104 chemical sciences Precipitation hardening Mechanics of Materials engineering General Materials Science 0210 nano-technology Eutectic system |
| Zdroj: | MRS Advances. 4:1427-1433 |
| ISSN: | 2059-8521 |
| DOI: | 10.1557/adv.2019.146 |
| Popis: | We present a high entropy alloy (HEA) from the system Al-Co-Cr-Fe-Ni with small additions of W, Mo, Si and C which was designed to allow for precipitation hardening by annealing in the temperature range from 600 to 900 °C. The alloy development was supported by thermodynamic computations using ThermoCalc software and the specimens were produced by arc melting. The microstructure of one selected sample in as-cast and annealed conditions was analysed using SEM/EDS, SEM/EBSD and TEM. The as-cast microstructure consists of spinodally decomposed BCC dendrites enveloped by FCC+Cr23C6 eutectic. Upon annealing at 700 °C for 24 h nanoscale precipitates form within the spinodal BCC as well as from FCC. Precipitation is exquisitely uniform leading to an increase in microhardness from 415 HV0.5 in the as-cast state to 560 HV0.5 after annealing. We investigated coarsening of this microstructure using varying holding time for a constant temperature of 700 °C. The microstructure evolution during coarsening and the corresponding mechanical properties obtained from instrumented indentation experiments are presented in this work. |
| Databáze: | OpenAIRE |
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