The equiatomic high-entropy alloy of composition of CrNiCoFeMn with an FCC crystal structure was prepared by either induction melting or additive manufacturing with a selective laser melting (SLM) process, starting from mechanically alloyed powders. The as-produced samples of both kinds were cold worked, and in some cases re-crystallized. Unlike induction melting, there is a second phase, which is made of fine nitride and Cr-rich σ phase precipitates, in the as-produced SLM alloy. Young’s modulus and damping measurements, as a function of temperature in the 300–800 K range, were performed on the specimens that were cold-worked and/or re-crystallized. Young’s modulus values of (140 ± 10) GPa and (90 ± 10) GPa were measured from the resonance frequency of free-clamped bar-shaped samples at 300 K for the induction-melted and SLM samples, respectively. The room temperature values increased to (160 ± 10) GPa and (170 ± 10) GPa for the re-crystallized samples. The damping measurements showed two peaks, which were attributed to dislocation bending and grain-boundary sliding. The peaks were superposed on an increasing temperature background.

Enrico Gianfranco Campari, Angelo Casagrande (2023). Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys. MATERIALS, 16(10), 1-14 [10.3390/ma16103689].

Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys

Enrico Gianfranco Campari
Primo
Investigation
;
Angelo Casagrande
Secondo
Formal Analysis
2023

Abstract

The equiatomic high-entropy alloy of composition of CrNiCoFeMn with an FCC crystal structure was prepared by either induction melting or additive manufacturing with a selective laser melting (SLM) process, starting from mechanically alloyed powders. The as-produced samples of both kinds were cold worked, and in some cases re-crystallized. Unlike induction melting, there is a second phase, which is made of fine nitride and Cr-rich σ phase precipitates, in the as-produced SLM alloy. Young’s modulus and damping measurements, as a function of temperature in the 300–800 K range, were performed on the specimens that were cold-worked and/or re-crystallized. Young’s modulus values of (140 ± 10) GPa and (90 ± 10) GPa were measured from the resonance frequency of free-clamped bar-shaped samples at 300 K for the induction-melted and SLM samples, respectively. The room temperature values increased to (160 ± 10) GPa and (170 ± 10) GPa for the re-crystallized samples. The damping measurements showed two peaks, which were attributed to dislocation bending and grain-boundary sliding. The peaks were superposed on an increasing temperature background.
2023
Enrico Gianfranco Campari, Angelo Casagrande (2023). Mechanical Spectroscopy Study of CrNiCoFeMn High-Entropy Alloys. MATERIALS, 16(10), 1-14 [10.3390/ma16103689].
Enrico Gianfranco Campari; Angelo Casagrande
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/925247
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