Chemical complexity induced local structural distortion in NiCoFeMnCr high-entropy alloy

Abstract

In order to study chemical complexity-induced lattice distortion in high-entropy alloys, the static Debye-Waller (D-W) factor of NiCoFeMnCr solid solution alloy is measured with low temperature neutron diffraction, ambient X-ray diffraction, and total scattering methods. The static atomic displacement parameter of the multi-element component alloy at 0 K is 0.035-0.041 Å, which is obvious larger than that of element Ni (∼ 0 Å). The atomic pair distance between individual atoms in the alloy investigated with extended X-ray absorption fine structure (EXAFS) measurements indicates that Mn has a slightly larger bond distance (∼ 0.4%) with neighbor atoms than that of others. IMPACT STATEMENT The chemical complexity induced local structural disorder in the high entropy alloy is distinguished from the thermal contribution by the combination of neutron and X-ray techniques.

Effects of 3d electron configurations on helium bubble formation and void swelling in concentrated solid-solution alloys

“…The random lattice site occupancy of different period-4 metals creates significant disorder in the electronic structures of the alloys, 5,7,26, although the disorder is often less significant in the lattice distortion because of the similar atomic size. [27][28][29][30][31] The chemical complexity in SP-CSAs made of 3d transition metals has been shown to provide a way to modify paths for energy dissipation and defect evolution. [3][4][5][6][7] For example, the physical origin of a twoorders-of-magnitude resistivity difference is demonstrated in alloys containing combinations of the closely related elements Ni, Co, Fe, Mn, and Cr.…”

“…Local lattice distortions from the random arrangement of different chemical elements may be limited in SP-CSAs composed of 3d transition metals, 27,29,31 but defects are shown to experience a complex energy landscape. 3 Complex energy landscapes modify transport properties and defect behavior.…”

Effect of interstitial carbon on the evolution of early-stage irradiation damage in equi-atomic FeMnNiCoCr high-entropy alloys

“…Equi-atomic FeMnNiCoCr, first reported by Cantor et al 1 , has been investigated extensively over the past decades [7][8][9] . It displays significant suppression of void swelling under irradiation compared to pure nickel 10 .…”

A candidate accident tolerant fuel system based on a highly concentrated alloy thin film

“…Highly concentrated alloys (HCAs) − which recently have exhibited enormous potential to revolutionise future nuclear power plants [18][19][20][21][22][23][24] − are herein proposed as an alternative to ceramic coatings on Zr-based alloys [10,11]. HCAs have been reported to possess superior radiation tolerance against energetic particle irradiation resulting from their intrinsically tuneable chemical complexity and thus the atomic-level inhomogeneity and complex energy landscapes [18,25].…”