Plastic deformation of single crystals of the equiatomic Cr-Mn-Fe-Co-Ni high-entropy alloy in tension and compression from 10 K to 1273 K

Kawamura, Marino; Asakura, Makoto; Okamoto, Norihiko L.; Kishida, Kyosuke; Inui, Haruyuki; George, Easo P.

doi:10.1016/j.actamat.2020.10.073

Title: Plastic deformation of single crystals of the equiatomic Cr-Mn-Fe-Co-Ni high-entropy alloy in tension and compression from 10 K to 1273 K

Journal Article · Tue Nov 03 00:00:00 EST 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.10.073· OSTI ID:1860599

Kawamura, Marino ^[1]; Asakura, Makoto ^[1];

^[1];

^[1]; Inui, Haruyuki ^[1];

^[2]

Kyoto Univ. (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)

In this report the plastic deformation behavior of single crystals of the quinary, equiatomic Cr-Mn-Fe-Co-Ni high-entropy alloy (HEA) with the face-centered cubic structure has been investigated in tension and compression as a function of crystal orientation and temperature from 10 K to 1373 K. The critical resolved shear stress (CRSS) for {111}<110> slip at room temperature is 42-45 MPa. It does not depend much on crystal orientation (i.e., the Schmid law holds true) and the sense (tension vs. compression) of the applied load. The CRSS for {111}<110> slip increases with the decrease in temperature, without showing any significant inertia effects at cryogenic temperatures below 77 K. Extrapolation from the measured yield stresses down to 10 K yields a CRSS value at 0 K of 168 MPa. At cryogenic temperatures, the measured strain-rate sensitivity of flow stress is consistent with a very small activation volume. The concept of stress equivalence holds true both for the temperature dependence of CRSS and the stress dependence of activation volume, indicating that solid-solution hardening is the major strengthening mechanism. Deformation twinning occurs at 77 K but not at room temperature, resulting in higher tensile elongation to failure at 77 K than at room temperature. Deformation twinning at 77 K occurs at a shear stress of 378 MPa on conjugate ($$\bar1\bar11$$) planes in the form of Lüders deformation after large plastic strain (about 85%) achieved by the stage I (easy glide) and stage II (linear work-hardening) deformation.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Kyoto Univ. (Japan)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Japan Society for the Promotion of Science (JSPS); USDOE

Grant/Contract Number:: AC05-00OR22725; JP18H05450; JP18H05451; JP18H01735; JP18H05478; JP19H00824; JPMXP0112101000

OSTI ID:: 1860599

Alternate ID(s):: OSTI ID: 1779345

Journal Information:: Acta Materialia, Vol. 203, Issue N.A.; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Plastic deformation of single crystals of the equiatomic Cr-Mn-Fe-Co-Ni high-entropy alloy in tension and compression from 10 K to 1273 K

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