Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling

The effect of cold rolling on the microstructure and mechanical properties of an Al- and C-containing CoCrFeNiMn-type high-entropy alloy was reported. The alloy with a chemical composition (at %) of (20-23) Co, Cr, Fe, and Ni; 8.82 Mn; 3.37 Al; and 0.69 C was produced by self-propagating high-temper...

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Bibliographic Details
Published in:Materials 2017-12, Vol.11 (1), p.53
Main Authors: Klimova, Margarita, Stepanov, Nikita, Shaysultanov, Dmitry, Chernichenko, Ruslan, Yurchenko, Nikita, Sanin, Vladimir, Zherebtsov, Sergey
Format: Article
Language:English
Subjects:
Banding
Chemical synthesis
Cold rolling
Deformation
Dislocation density
Edge dislocations
Elongation
Evolution
High entropy alloys
Manganese
Mechanical properties
Microstructure
Nickel
Self propagating high temperature synthesis
Stacking fault energy
Twinning
Yield strength
Yield stress
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Summary:The effect of cold rolling on the microstructure and mechanical properties of an Al- and C-containing CoCrFeNiMn-type high-entropy alloy was reported. The alloy with a chemical composition (at %) of (20-23) Co, Cr, Fe, and Ni; 8.82 Mn; 3.37 Al; and 0.69 C was produced by self-propagating high-temperature synthesis with subsequent induction. In the initial as-cast condition the alloy had an face centered cubic single-phase coarse-grained structure. Microstructure evolution was mostly associated with either planar dislocation glide at relatively low deformation during rolling (up to 20%) or deformation twinning and shear banding at higher strain. After 80% reduction, a heavily deformed twinned/subgrained structure was observed. A comparison with the equiatomic CoCrFeNiMn alloy revealed higher dislocation density at all stages of cold rolling and later onset of deformation twinning that was attributed to a stacking fault energy increase in the program alloy; this assumption was confirmed by calculations. In the initial as-cast condition the alloy had low yield strength of 210 MPa with yet very high uniform elongation of 74%. After 80% rolling, yield strength approached 1310 MPa while uniform elongation decreased to 1.3%. Substructure strengthening was found to be dominated at low rolling reductions (
ISSN:1996-1944
1996-1944
DOI:10.3390/ma11010053