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
·
· Acta Materialia
- 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.
- Research Organization:
- Kyoto Univ. (Japan); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Japan Society for the Promotion of Science (JSPS); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1860599
- Alternate ID(s):
- OSTI ID: 1779345
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: N.A. Vol. 203; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tensile and compressive plastic deformation behavior of medium-entropy Cr-Co-Ni single crystals from cryogenic to elevated temperatures
DEFORMATION MODES OF ZIRCONIUM AT 77, 575, AND 1075 K
Twin nucleation and migration in FeCr single crystals
Journal Article
·
Sat Oct 30 20:00:00 EDT 2021
· International Journal of Plasticity
·
OSTI ID:1862149
DEFORMATION MODES OF ZIRCONIUM AT 77, 575, AND 1075 K
Journal Article
·
Sat Oct 01 00:00:00 EDT 1960
· Trans. Met. Soc. AIME
·
OSTI ID:4156895
Twin nucleation and migration in FeCr single crystals
Journal Article
·
Mon Jan 14 23:00:00 EST 2013
· Materials Characterization
·
OSTI ID:22163174