The effect of nitrogen alloying on hydrogen-assisted plastic deformation and fracture in FeMnNiCoCr high-entropy alloys
| Autor: | M.Yu. Panchenko, E. V. Melnikov, Sergey V. Astafurov, Hans Jürgen Maier, Valentina Moskvina, Kseniya A. Reunova, Elena G. Astafurova, A. S. Mikhno |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Alloy chemistry.chemical_element 02 engineering and technology engineering.material 01 natural sciences 0103 physical sciences Ultimate tensile strength General Materials Science Embrittlement 010302 applied physics Austenite Mechanical Engineering High entropy alloys Metallurgy technology industry and agriculture Metals and Alloys Strain hardening exponent equipment and supplies 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry Mechanics of Materials engineering 0210 nano-technology Hydrogen embrittlement |
| Zdroj: | Scripta Materialia. 194:113642 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2020.113642 |
| Popis: | In the present study, the effect of nitrogen alloying on hydrogen embrittlement in FeMnNiCoCr high-entropy alloys was investigated. In tension, hydrogen-free nitrogen-alloyed FeMnNiCoCrN alloy (0.37 wt.% N) demonstrated higher strength, strain hardening, and elongation-to-failure than the interstitial-free FeMnNiCoCr Cantor alloy. Despite the different tensile properties, both alloys fractured via a ductile dimple micromechanism. After hydrogen charging, the nitrogen-alloyed material demonstrated lower strain hardening and higher sensitivity to hydrogen-assisted embrittlement than the interstitial-free alloy. Both alloys featured a stable austenitic structure and similar grain size, yet, the nitrogen-alloyed FeMnNiCoCr alloy was more susceptible to hydrogen embrittlement. Although, the overall degradation effects appear similar, there are pronounced differences in mechanical behavior and hydrogen transport upon hydrogen charging when the high-entropy alloys are compared to conventional austenitic stainless steels, and the experiments reveales that nitrogen alloying enhances hydrogen diffusivity in the Cantor alloy. |
| Databáze: | OpenAIRE |
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