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Title: Coupled effect of Cr and Al on interactions between a prismatic interstitial dislocation loop and an edge dislocation line in Fe-Cr-Al alloy

Journal Article · · Acta Materialia
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1];  [1];  [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [1]
  1. Shandong Univ., Qingdao, Shandong (China)
  2. Shandong Univ., Qingdao, Shandong (China); Jilin Univ., Changchun (China)
  3. Xi'an High Technology Research Center, Xi'an (China)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Harbin University of Technology (China)
  6. Shandong Univ., Qingdao, Shandong (China); Chinese Academy of Sciences (CAS), Lanzhou (China)
  7. Univ. of Michigan, Ann Arbor, MI (United States)

Segregation of alloying elements to a prismatic dislocation loop under irradiation is an important phenomenon in understanding the role of loops in radiation effects in alloys. In this work, various segregation sequences of Cr and Al atoms to a $$\langle$$100$$\rangle$$ and a 1/2 $$\langle$$111$$\rangle$$ prismatic dislocation loop in a Fe-Cr-Al alloy are explored using molecular dynamics method and ab initio energy calculation. Here, the results reveal that Cr can readily segregate to the loops while Al atoms cannot by themselves, but the segregated Cr atoms are able to promote Al segregation at the loops, defined as a coupled segregation of Cr and Al. After interacting with Cr and Al, a previously mobile 1/2 $$\langle$$111$$\rangle$$ loop becomes sessile. Al segregation through the coupled segregation process can further affect the pinning behavior of a dislocation loop to an edge dislocation motion. By varying the Al fraction in the segregated solutes, a nonlinear dependence of the pinning effect on dislocation motion is determined. At lower fractions, the pinning strength increases with the increasing Al fraction until Al fraction reaches a critical value of about 19%, above which the pinning strength decreases with further increase of Al fraction. All these results suggest that, in addition to the effect of Al on the surface resistance to oxidation, Al effect on the dislocation loop behavior is important to optimize the composition of Fe-Cr-Al alloys for their applications in accident tolerant fuel concepts.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC05-76RL01830; 12075141; 12105159; 12175125; AC05–76RLO-1830
OSTI ID:
1963909
Alternate ID(s):
OSTI ID: 1907303
Report Number(s):
PNNL-SA-174761
Journal Information:
Acta Materialia, Vol. 245; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (50)

Projector augmented-wave method journal December 1994
Chapter 88 Dislocation–Obstacle Interactions at the Atomic Level book January 2009
Oxidation Studies on the Iron-Chromium-Aluminum Heater Alloys journal January 1959
Alumina Scale Formation on a Powder Metallurgical FeCrAl Alloy (Kanthal APMT) at 900–1,100 °C in Dry O2 and in O2 + H2O journal September 2009
Density-functional exchange-energy approximation with correct asymptotic behavior journal September 1988
Molecular dynamics study of melting and freezing of small Lennard-Jones clusters journal September 1987
The effect of Al on the 475°C embrittlement of Fe–Cr alloys journal June 2013
Radiation effects in SiC for nuclear structural applications journal June 2012
Engineering hybrid nanotube wires for high-power biofuel cellspace journal April 2010
Radiation-induced strengthening and absorption of dislocation loops in ferritic Fe–Cr alloys: the role of Cr segregation journal June 2013
New understanding of nano-scale interstitial dislocation loops in BCC iron journal October 2017
Development and property evaluation of nuclear grade wrought FeCrAl fuel cladding for light water reactors journal December 2015
Mitigating grain growth in binary nanocrystalline alloys through solute selection based on thermodynamic stability maps journal March 2014
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Orowan strengthening at low temperatures in bcc materials studied by dislocation dynamics simulations journal January 2011
Heavy-ion irradiations of Fe and Fe–Cr model alloys Part 2: Damage evolution in thin-foils at higher doses journal July 2008
Mechanisms of radiation strengthening in Fe–Cr alloys as revealed by atomistic studies journal November 2013
Metropolis Monte Carlo simulations of ordering and clustering in FeCr alloys journal January 2008
Simulation of the interaction between an edge dislocation and a 〈100〉 interstitial dislocation loop in α-iron journal October 2008
Chromium enrichment on the habit plane of dislocation loops in ion-irradiated high-purity Fe–Cr alloys journal October 2014
Advanced oxidation-resistant iron-based alloys for LWR fuel cladding journal May 2014
High temperature oxidation of fuel cladding candidate materials in steam–hydrogen environments journal September 2013
Aluminum and vacancies in α -iron: Dissolution, diffusion, and clustering journal May 2010
Ab initiomolecular dynamics for liquid metals journal January 1993
Orowan strengthening and forest hardening superposition examined by dislocation dynamics simulations journal October 2010
Interatomic potentials and defect properties of Fe–Cr–Al alloys journal December 2020
Effect of step wise variation of oxygen potential during the isothermal sintering on the grain growth behavior in Cr2O3 doped UO2 pellets journal October 2012
The microstructure of neutron-irradiated Fe–Cr alloys: A small-angle neutron scattering study journal February 2011
Beyond the local-density approximation in calculations of ground-state electronic properties journal August 1983
Dislocation loop formation in model FeCrAl alloys after neutron irradiation below 1 dpa journal November 2017
Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys journal March 2013
Release of helium from irradiation damage in Fe–9Cr ferritic alloy journal August 2004
Grain boundary segregation and thermodynamically stable binary nanocrystalline alloys journal March 2009
Conjugate gradient method journal July 2009
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
Automated identification and indexing of dislocations in crystal interfaces journal October 2012
Computer simulation of reactions between an edge dislocation and glissile self-interstitial clusters in iron journal September 2006
Ab initio study of Cr interactions with point defects in bcc Fe journal January 2007
Atoms, molecules, solids, and surfaces: Applications of the generalized gradient approximation for exchange and correlation journal September 1992
Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool journal December 2009
Systematic analysis of local atomic structure combined with 3D computer graphics journal March 1994
Metropolis Monte-Carlo simulation of segregation in Fe–Cr alloys journal October 2011
LAMMPS - a flexible simulation tool for particle-based materials modeling at the atomic, meso, and continuum scales journal February 2022
Effect of steam on high temperature oxidation behaviour of alumina-forming alloys journal January 2015
Mechanical properties of neutron-irradiated model and commercial FeCrAl alloys journal June 2017
A combined APT and SANS investigation of α′ phase precipitation in neutron-irradiated model FeCrAl alloys journal May 2017
Dislocation loop evolution during in-situ ion irradiation of model FeCrAl alloys journal September 2017
Radiation tolerance of neutron-irradiated model Fe–Cr–Al alloys journal October 2015
Uniform corrosion of FeCrAl alloys in LWR coolant environments journal October 2016
Structural materials challenges for advanced reactor systems journal March 2009