Imaxe de Portada

Temperature-Dependent Mechanical Properties of CoCrFeNi Medium-Entropy Alloy Produced by Laser-Directed Energy Deposition

Gardado en:
Publicado en:Metals vol. 15, no. 1 (2025), p. 9
Autor Principal: Klimova, Margarita
Outros autores: Krasanov, Igor, Astakhov, Ilya, Kovalenko, Ekaterina, Kochura, Elizaveta, Semenyuk, Anastasia, Zherebtsov, Sergey, Klimova-Korsmik, Olga, Stepanov, Nikita
Publicado:
MDPI AG
Materias:
United States > US
Japan
Mechanical properties
Medium entropy alloys
Columnar structure
Investigations
Deposition
Grain boundaries
Thermomechanical treatment
Room temperature
Recrystallization
Dislocation density
Scientific imaging
Energy
Grain size
Microstructure
Entropy
Annealing
Solid solutions
Temperature dependence
Grain growth
Ultimate tensile strength
Cryogenic temperature
Lasers
Thermomechanical properties
Temperature
Ductility
Deformation
Alloys
Yield strength
Acceso en liña:Citation/Abstract
Full Text + Graphics
Full Text - PDF
Etiquetas: Engadir etiqueta
Sen Etiquetas, Sexa o primeiro en etiquetar este rexistro!
Resumo:The temperature dependence of the mechanical properties of the CoCrFeNi medium-entropy alloy (MEA) manufactured by laser-directed energy deposition (L-DED) and additionally annealed at 1200 °C for 24 h was studied. The microstructure of the as-deposited alloy was represented by a single-phase face-centered cubic structure with coarse columnar grains and a high density of dislocation. Annealing resulted in the development of recrystallization and a reduction in dislocation density. The CoCrFeNi alloy produced by L-DED demonstrated mechanical properties comparable with those of the fine-grained equiatomic CoCrFeMnNi alloy, produced by casting followed by thermomechanical processing. Namely, as-deposited CoCrFeNi had a yield strength (YS) and ultimate tensile strength (UTS) of YS = 370 MPa and UTS = 610 MPa at room temperature, and YS = 565 MPa and UTS = 965 MPa at cryogenic temperature, along with a ductility of ~60%. Annealing resulted in a decrease in strength to YS = 180/350 MPa at 293/77 K. A quantitative analysis of various strengthening mechanisms showed that some strength increment of the as-deposited alloy was ensured by the high dislocation density formed during L-DED.
ISSN:2075-4701
DOI:10.3390/met15010009
Fonte:Materials Science Database