Twinning in -oriented single crystals of CoCrFeMnNi high-entropy alloy at tensile deformation
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© 2017 Elsevier B.V. This paper presents research about the tensile deformation behaviour and deformation mechanisms (slip and twinning) in single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 (at%) high-entropy alloy (HEA) oriented along the  direction in the temperature range T = 77–573 K. Classical studies on single crystals of pure metals and their substitution alloys with the face-centered cubic (FCC) structure, with a low stacking fault energy, have shown that deformation twinning in single crystals oriented along the  direction does not develop at tensile deformation. In the present paper, extrinsic stacking faults and deformation twinning in the -oriented single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 HEA were detected under tensile loading at the temperature of liquid nitrogen after a strain of 5%. The critical resolved shear stress for twinning was determined as τcrtw =210 ± 10 MPa. Deformation twinning in the -oriented single crystals leads to an increase in the strain hardening coefficient in comparison with the slip deformation in these crystals at T > 77 K.
author list (cited authors)
Kireeva, I. V., Chumlyakov, Y. I., Pobedennaya, Z. V., Vyrodova, A. V., & Karaman, I.