Plane-Stress Deformation Behavior of CoCrFeMnNi High-Entropy Alloy Sheet under Low Temperatures

High-entropy alloys are promising candidates expected to be applied in transportation equipment serving in extreme environments due to their excellent properties. CoCrFeMnNi high-entropy alloy is a typical representative of them, and its low temperature performance is excellent. In this study, to ev...

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Bibliographic Details
Published in:Materials 2024-05, Vol.17 (10), p.2259
Main Authors: Qu, Haitao, Han, Yujie, Shi, Jiaai, Li, Mengmeng, Liang, Jiayu, Zheng, Jinghua
Format: Article
Language:English
Subjects:
Alloys
Annealing
Axial stress
Bulging tests
Cold
Cryogenic temperature
Deformation
Deformation mechanisms
Ductility
Entropy
Extreme environments
Extrusion dies
Feasibility studies
High entropy alloys
Hot extrusion
Investigations
Low temperature
Mechanical properties
Metal sheets
Specialty metals industry
Stress state
Temperature
Tensile strength
Tensile tests
Thin walled shells
Yield stress
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Summary:High-entropy alloys are promising candidates expected to be applied in transportation equipment serving in extreme environments due to their excellent properties. CoCrFeMnNi high-entropy alloy is a typical representative of them, and its low temperature performance is excellent. In this study, to evaluate the feasibility of forming HEA shells, the deformation behavior of CoCrFeMnNi under a plane-stress state at lower temperatures was thoroughly studied. Firstly, a thin-walled HEA tube was fabricated using hot extrusion and further formed into a thin shell for uniaxial tensile and biaxial bulging tests. Subsequently, uniaxial tensile tests at cryogenic temperatures were conducted. Both the strength and the ductility improves as the temperature decreases from -160 °C to -196 °C. Then, a systematic low-temperature bulging test was performed using isothermal dome tests and the thickness uniformity analysis of the bulged specimens was carried out. In addition, grain microstructural observation using EBSD was characterized analyze the possible deformation mechanism at the cryogenic temperature under the biaxial stress state. This study, for the first time, investigated the biaxial deformation behavior of HEA. Considering the plane-stress state deformation is the dominant type in the thin-walled shell deformation, this study enables us to provide direct guidance for various sheet-forming processes of HEAs.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17102259