Deformation behavior of a Co-Cr-Fe-Ni-Mo medium-entropy alloy at extremely low temperatures
| Autor: | Hyoung Seop Kim, Peter K. Liaw, Jamieson Brechtl, Elena D. Tabachnikova, Wenqing Wang, Jongun Moon, Tetiana Hryhorova, Hyeon Seok Do, Alireza Zargaran, Byeong-Joo Lee, Yuri Estrin, Karin A. Dahmen, Jae Wung Bae, S. É. Shumilin |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Alloy Atmospheric temperature range engineering.material Strain hardening exponent Condensed Matter Physics Mechanics of Materials Diffusionless transformation Ultimate tensile strength engineering General Materials Science Deformation (engineering) Composite material Dislocation Ductility |
| Zdroj: | Materials Today. 50:55-68 |
| ISSN: | 1369-7021 |
| DOI: | 10.1016/j.mattod.2021.08.001 |
| Popis: | We report the mechanical and microstructural characteristics of a medium-entropy alloy, Co17.5Cr12.5Fe55Ni10Mo5 (atomic percent, at%) at cryogenic temperatures, down to a record low temperature of 0.5 K. The alloy exhibits excellent strength and ductility combined with a high strain-hardening rate in the entire temperature range investigated. Its property profile, including the yield strength, ultimate tensile strength, strain hardening capability, and absorbed mechanical energy, is better than those of most alloys and HEAs used in cryogenics. Within the interval of extremely low temperatures considered (0.5–4.2 K), the alloy exhibits several unusual features, including anomalies of the temperature dependence of the yield strength and tensile ductility, discontinuous plastic deformation (DPF), and a change in the propensity for the deformation-induced martensitic transformation. While the occurrence of these effects in the same temperature interval may be fortuitous, we hypothesize that they are interrelated and provide a tentative explanation of the observed phenomena on this basis. |
| Databáze: | OpenAIRE |
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