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Title: Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys

Journal Article · · Materialia

Here, a major challenge for future nuclear reactors is to design nuclear materials that can sustain extremely prolonged radiation damage. Local lattice distortion, considered as a core effect of high-entropy alloys (HEAs), can suppress the growth of radiation defects to control radiation performance. However, local lattice distortion in HEAs is rarely quantitatively measured. Here we employed total scattering technique to study the local structure of the face-centered cubic (fcc) equiatomic FeCoNiCr MEA, and FeCoNiCrMn and FeCoNiCrPd HEAs before and after ion irradiation. Their local lattice distortions were quantitatively evaluated based on the difference of lattice constant between the local structure and the average structure. We revealed that the mean local lattice distortion in the pristine samples varies in the following order: FeCoNiCr < FeCoNiCrMn < FeCoNiCrPd. Density functional theory (DFT) calculations further unveiled that the fluctuation of local distortions in FeCoNiCr and FeCoNiCrMn is less than 5%, whereas the highest bond-length fluctuation in FeCoNiCrPd can approach to 8%. Under irradiation the mean local lattice distortion in FeCoNiCr and FeCoNiCrMn evolves differently from FeCoNiCrPd by showing a relaxation behavior at low dose. And the impact of local lattice distortion on dislocation loops after a prolonged ion-irradiation was investigated by transmission electron microscope (TEM) and the underlying mechanism was discussed.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1460240
Journal Information:
Materialia, Journal Name: Materialia Vol. 2; ISSN 2589-1529
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (52)

Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes journal May 2004
Solid-Solution Phase Formation Rules for Multi-component Alloys journal June 2008
Local Atomic Structure of a High-Entropy Alloy: An X-Ray and Neutron Scattering Study journal November 2012
Alloy Design Strategies and Future Trends in High-Entropy Alloys journal October 2013
Local Electronic Effects and Irradiation Resistance in High-Entropy Alloys journal August 2015
Substitutional solution hardening journal March 1963
Void-swelling in irons and ferritic steels journal November 1979
Grain boundary segregation under electron irradiation in austenitic stainless steels modified with oversized elements journal July 1992
Calibration and correction of spatial distortions in 2D detector systems
  • Hammersley, A. P.; Svensson, S. O.; Thompson, A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 346, Issue 1-2 https://doi.org/10.1016/0168-9002(94)90720-X
journal July 1994
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
On the mechanism of radiation-induced segregation in austenitic Fe–Cr–Ni alloys journal May 1998
Diffusion rates of 3d transition metal solutes in nickel by first-principles calculations journal May 2005
Calculation of impurity diffusivities in α-Fe using first-principles methods journal April 2010
Sluggish diffusion in Co–Cr–Fe–Mn–Ni high-entropy alloys journal August 2013
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy journal September 2013
Size-dependent plasticity in an Nb25Mo25Ta25W25 refractory high-entropy alloy journal February 2014
Temperature dependence of the mechanical properties of equiatomic solid solution alloys with face-centered cubic crystal structures journal December 2014
A geometric model for intrinsic residual strain and phase stability in high entropy alloys journal August 2015
Theory of strengthening in fcc high entropy alloys journal October 2016
Thermal activation mechanisms and Labusch-type strengthening analysis for a family of high-entropy and equiatomic solid-solution alloys journal November 2016
An assessment of the lattice strain in the CrMnFeCoNi high-entropy alloy journal January 2017
Radiation-induced segregation on defect clusters in single-phase concentrated solid-solution alloys journal April 2017
Stacking fault energies of face-centered cubic concentrated solid solution alloys journal August 2017
Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys journal October 2017
Phase stability, physical properties and strengthening mechanisms of concentrated solid solution alloys journal October 2017
Atomic-size and lattice-distortion effects in newly developed high-entropy alloys with multiple principal elements journal September 2015
Assessment of radiation-induced segregation mechanisms in austenitic and ferritic–martensitic alloys journal April 2011
The effect of injected interstitials on void formation in self-ion irradiated nickel containing concentrated solid solution alloys journal May 2017
High-entropy alloy: challenges and prospects journal July 2016
Microstructural development in equiatomic multicomponent alloys journal July 2004
New ion beam materials laboratory for materials modification and irradiation effects research journal November 2014
Effects of compositional complexity on the ion-irradiation induced swelling and hardening in Ni-containing equiatomic alloys journal July 2016
Evolution of irradiation-induced strain in an equiatomic NiFe alloy journal November 2017
Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures journal February 2016
Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase alloys journal December 2016
Influence of chemical disorder on energy dissipation and defect evolution in concentrated solid solution alloys journal October 2015
Tailoring the physical properties of Ni-based single-phase equiatomic alloys by modifying the chemical complexity journal February 2016
Multistep damage evolution process in cubic zirconia irradiated with MeV ions journal October 2009
Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening journal December 2016
High-Entropy Alloys: A Critical Review journal April 2014
Influence of elastic properties on the strain induced by ion irradiation in crystalline materials journal December 2012
PDFfit2 and PDFgui: computer programs for studying nanostructure in crystals journal July 2007
Projector augmented-wave method journal December 1994
Direct Observation of Dopant Atom Diffusion in a Bulk Semiconductor Crystal Enhanced by a Large Size Mismatch journal October 2014
Mechanism of Radiation Damage Reduction in Equiatomic Multicomponent Single Phase Alloys journal April 2016
Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy journal May 2017
Special quasirandom structures journal July 1990
Generalized Gradient Approximation Made Simple journal October 1996
Solute Diffusion in Metals: Larger Atoms Can Move Faster journal February 2004
PDFgetX3 : a rapid and highly automatable program for processing powder diffraction data into total scattering pair distribution functions journal March 2013
A fracture-resistant high-entropy alloy for cryogenic applications journal September 2014
Lattice Distortions in the FeCoNiCrMn High Entropy Alloy Studied by Theory and Experiment journal September 2016

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