Effect of Interstitial Elements on the Cryogenic Mechanical Behavior of FCC High Entropy Alloys

Abstract:

High entropy alloys (HEAs) with face-centered cubic (fcc) structure, namely equiatomic CoCrFeMnNi alloy, have attracted considerable attention because of impressive cryogenic mechanical properties – strength, ductility, and fracture toughness. Further increase of the properties can be achieved, for example, by proper alloying. A particularly attractive option is the addition of interstitial elements like carbon or nitrogen. In present work, a series of CoCrFeMnNi-based alloys with different amounts of C and N (0-2 at.%) was prepared by induction melting. The alloys doped with C had lower Cr content to increase the solubility of carbon in the fcc solid solution. It was revealed that the solid solution strengthening effect of both C and N is significantly increased when the testing temperature decreases from 293K to 77K. The effect of thermomechanical processing on the structure and mechanical properties of the alloys is analyzed.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1386-1391
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1386
• Online since: January 2021
• Authors: Anastasia Semenyuk, Margarita Klimova, Sergey Zherebtsov, Nikita Stepanov*
• Keywords: Deformation Mechanisms, High Entropy Alloys, Interstitial Elements, Mechanical Properties

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