Tensile and compressive plastic deformation behavior of medium-entropy Cr-Co-Ni single crystals from cryogenic to elevated temperatures

Li, Le; Chen, Zhenghao; Kuroiwa, Shogo; Ito, Mitsuhiro; Kishida, Kyosuke; Inui, Haruyuki; George, Easo P.

doi:10.1016/j.ijplas.2021.103144

Tensile and compressive plastic deformation behavior of medium-entropy Cr-Co-Ni single crystals from cryogenic to elevated temperatures

Journal Article · Sun Oct 31 00:00:00 EDT 2021 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2021.103144· OSTI ID:1862149

Li, Le ^[1]; Chen, Zhenghao ^[2]; Kuroiwa, Shogo ^[1]; Ito, Mitsuhiro ^[1]; Kishida, Kyosuke ^[3]; Inui, Haruyuki ^[3]; ^[4]

Kyoto Univ. (Japan)
Kyoto Univ. (Japan). Center for Elements Strategy Initiative for Structure Materials (ESISM)
Kyoto Univ. (Japan); Kyoto Univ. (Japan). Center for Elements Strategy Initiative for Structure Materials (ESISM)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The equiatomic Cr-Co-Ni medium-entropy alloy has the face-centered cubic (FCC) structure. Bulk single crystals of this alloy were grown and tested in tension and compression between 14 K and 1373 K with the loading axis parallel to [23]. At room temperature, the critical resolved shear stress (CRSS) for {111}<10> slip is 65 ± 5 MPa and does not exhibit a tension-compression asymmetry. It does, however, increase significantly as the test temperature decreases. A dulling of this temperature dependence occurs below 50 K, which may be due to the inertia effect. When the measured values above 50 K are extrapolated to lower temperatures, a value of 225 MPa is estimated for the CRSS at 0 K. This is larger than that (168 MPa) previously determined for the equiatomic Cr-Mn-Fe-Co-Ni high-entropy alloy using a similar procedure. The stacking fault energy of the present Cr-Co-Ni is estimated to be about 14 mJm-2, which is sufficiently low to account for deformation twinning both at 77 K and room temperature. Twinning at 77 K occurs on conjugate (1) planes at an onset shear stress of 482 MPa after primary slip and propagates in the form of Lüders deformation. At room temperature, twinning occurs uniformly throughout the gauge section on primary (111) planes at an onset shear stress of 381 MPa after primary and subsequent conjugate slip. Thin layers with the hexagonal close-packed stacking are observed in association with twinning both at 77 K and room temperature.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: JSPS KAKENHI; JST CREST; MEXT; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1862149

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Journal Issue: N.A. Vol. 148; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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