Ordering effects on deformation substructures and strain hardening behavior of a CrCoNi based medium entropy alloy

Miao, Jiashi; Slone, Connor; Dasari, Sriswaroop; Ghazisaeidi, Maryam; Banerjee, Rajarshi; George, Easo P.; Mills, Michael J.

doi:10.1016/j.actamat.2021.116829

Title: Ordering effects on deformation substructures and strain hardening behavior of a CrCoNi based medium entropy alloy

Journal Article · Thu Mar 25 00:00:00 EDT 2021 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2021.116829· OSTI ID:1860601

Miao, Jiashi ^[1]; Slone, Connor ^[1];

^[2]; Ghazisaeidi, Maryam ^[1];

^[2];

^[3]; Mills, Michael J. ^[1]

The Ohio State Univ., Columbus, OH (United States)
Univ. of North Texas, Denton, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Here, a CrCoNi based medium entropy alloy with small additions of Ti, Al and Nb (denoted as (CrCoNi)₉₃Al₄Ti₂Nb) in the as-quenched condition, exhibits tensile properties comparable to those of the equiatomic CrCoNi alloy at room temperature. Dark field transmission electron microscopy (TEM), atomic resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) together with atom probe tomography (APT) show that spatially-localized long range ordering (LRO) L1₂ domains exist in this alloy. The evolution of deformation substructure with plastic deformation in this alloy was characterized using electron backscatter diffraction (EBSD), electron channeling contrast imaging (ECCI) and STEM based techniques including the recently developed weak beam dark field STEM imaging. Plastic deformation occurs by the slip of a/2<110>dislocations, which are narrowly dissociated into Shockley partial dislocations on {111} slip planes. Their dissociation distances in the (CrCoNi)₉₃Al₄Ti₂Nb alloy are much smaller than the widths of the corresponding partials in the equiatomic CrCoNi alloy due to one or more of the minor alloying elements (Al, Ti, Nb). Dislocation slip in this alloy has a pronounced planar character. The leading dislocations in slip bands glide as pairs due to the existence of LRO domains. Multipoles were formed through the slip of dislocations with opposite signs on adjacent {111} slip planes. Those multipoles serve as building blocks for the formation of subgrain structures consisting of fine slip bands. The distances between slip bands were continuously refined during plastic deformation and dynamic refinement of slip bands plays a crucial role in strain hardening. The effects of LRO domains on planar dislocation slip, the deactivation of deformation twinning and strain hardening of this alloy are discussed.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); National Science Foundation Graduate Research Fellowship Program; US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; DMR-1905748; DGE-1343012; FA9550-17-1-0395

OSTI ID:: 1860601

Alternate ID(s):: OSTI ID: 1782883

Journal Information:: Acta Materialia, Vol. 210, Issue N.A.; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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