Structure and properties of equiatomic CoCrFeNiMn alloy fabricated by high-energy ball milling and spark plasma sintering

High-entropy alloy CoCrFeNiMn was produced by short high energy ball milling (90 min) and spark plasma sintering (10 min at 1073 K). Co-existence of two fcc-phases with lattice parameters 0.360 nm and 0.356 nm was demonstrated via HRTEM, XRD and other methods. The matrix fcc-phase with larger parame...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-10, Vol.805, p.1237-1245
Main Authors: Rogachev, A.S., Vadchenko, S.G., Kochetov, N.A., Rouvimov, S., Kovalev, D.Yu, Shchukin, A.S., Moskovskikh, D.O., Nepapushev, A.A., Mukasyan, A.S.
Format: Article
Language:English
Subjects:
Atomic scale structure
Ball milling
Chemical precipitation
Electrical transport
Free electrons
Heat conduction
Heat conductivity
Heat transfer
High entropy alloys
High temperature
Lattice parameters
Mechanical alloying
Phase transitions
Plasma sintering
Precipitates
Spark plasma sintering
Thermal conductivity
Thermodynamic properties
Transition metal alloys
X-ray diffraction
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Summary:High-entropy alloy CoCrFeNiMn was produced by short high energy ball milling (90 min) and spark plasma sintering (10 min at 1073 K). Co-existence of two fcc-phases with lattice parameters 0.360 nm and 0.356 nm was demonstrated via HRTEM, XRD and other methods. The matrix fcc-phase with larger parameter transforms into the more compact phase during annealing up to 1273 K. Similar transformation partially occurs after SPS. Some elements, mostly Cr and Mn, released from the matrix phase and formed precipitates. Up to three types of precipitates, with characteristic size from 10-30 nm to 200–300 nm, have been detected and studied. Electric and thermal properties of the material, measured at room and elevated temperature, shown that lattice thermal conductivity plays an important role, along with free electron thermal conductivity. [Display omitted] •CoCrFeNiMn produced by 90 min of high energy ball milling and consolidated by SPS.•Two fcc-phases present in the alloy with lattice parameters 0.360 and 0.356 nm.•The loose fcc-phase transforms into more compact phase when annealing up to 1273 K.•Cr and Mn release from the fcc-matrix phase forming precipitates 10-30 and 200–300 nm.•Electric and thermal conductivities are measured at room and elevated temperature.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.07.195