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Precipitation Hardenable High Entropy Alloy for Tooling Applications

Published online by Cambridge University Press:  22 February 2019

O. Stryzhyboroda ,
U. Hecht ,
V. T. Witusiewicz ,
G. Laplanche ,
A. Asabre ,
M.B. Wilms  and
A. Weisheit
O. Stryzhyboroda*
Affiliation:
ACCESS e.V., Intzestraße 5, D-52072 Aachen, Germany
U. Hecht
Affiliation:
ACCESS e.V., Intzestraße 5, D-52072 Aachen, Germany
V. T. Witusiewicz
Affiliation:
ACCESS e.V., Intzestraße 5, D-52072 Aachen, Germany
G. Laplanche
Affiliation:
Institut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, Germany
A. Asabre
Affiliation:
Institut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, Germany
M.B. Wilms
Affiliation:
Fraunhofer-Institut für Lasertechnik ILT, Steinbachstraße 15, 52074Aachen, Germany
A. Weisheit
Affiliation:
Fraunhofer-Institut für Lasertechnik ILT, Steinbachstraße 15, 52074Aachen, Germany
*
*(Email: o.stryzhyboroda@access-technology.de)
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Abstract

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.

Keywords

additive manufacturingcrystalmicrostructuremodelingthermodynamics
Type
Articles
Information
MRS Advances , Volume 4 , Issue 25-26: Processing and Manufacturing , 2019 , pp. 1427 - 1433
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Copyright
Copyright © Materials Research Society 2019 

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References

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