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Title: Microstructural stability and mechanical behavior of FeNiMnCr high entropy alloy under ion irradiation

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [1];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)

In recent years, high entropy alloys (HEAs) have attracted significant attention due to their excellent mechanical properties and good corrosion resistance, making them potential candidates for high temperature fission and fusion structural applications. However there is very little known about their radiation resistance, particularly at elevated temperatures relevant for energy applications. In the present study, a single phase (face centered cubic) concentrated solid solution alloy of composition 27%Fe-28%Ni-27%Mn-18%Cr was irradiated with 3 or 5.8 MeV Ni ions at temperatures ranging from room temperature to 700 °C and midrange doses from 0.03 to 10 displacements per atom (dpa). Transmission electron microscopy (TEM), scanning transmission electron microscopy with energy dispersive x-ray spectrometry (STEM/EDS) and X-ray diffraction (XRD) were used to characterize the radiation defects and microstructural changes. Irradiation at higher temperatures showed evidence of relatively sluggish solute diffusion with limited solute depletion or enrichment at grain boundaries. The main microstructural feature at all temperatures was high-density small dislocation loops. Voids were not observed at any irradiation condition. Nano-indentation tests on specimens irradiated at room temperature showed a rapid increase in hardness ~35% and ~80% higher than the unirradiated value at 0.03 and 0.3 dpa midrange doses, respectively. The irradiation-induced hardening was less pronounced for 500 °C irradiations (<20% increase after 3 dpa). Overall, the examined HEA material exhibits superior radiation resistance compared to conventional single phase Fe-Cr-Ni austenitic alloys such as stainless steels. Furthermore, the present study provides insight on the fundamental irradiation behavior of a single phase HEA material over a broad range of irradiation temperatures.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1256811
Alternate ID(s):
OSTI ID: 1326425
Journal Information:
Acta Materialia, Vol. 113, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 331 works
Citation information provided by
Web of Science

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Cited By (29)

Effects of Al and Ti Additions on Irradiation Behavior of FeMnNiCr Multi-Principal-Element Alloy journal October 2019
Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design journal December 2019
Radiation stability of nanocrystalline single-phase multicomponent alloys journal February 2019
Breakthrough applications of high-entropy materials journal August 2018
Irradiation responses and defect behavior of single-phase concentrated solid solution alloys journal September 2018
Outstanding radiation resistance of tungsten-based high-entropy alloys journal March 2019
A Novel Low-Activation VCrFeTaxWx (x = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance journal December 2018
Effects of pulsed laser surface treatments on microstructural characteristics and hardness of CrCoNi medium-entropy alloy journal August 2019
Dissimilar welding of Al 0.1 CoCrFeNi high-entropy alloy and AISI304 stainless steel journal June 2019
Corrosion resistance mechanism of the passive films formed on as-cast FeCoCrNiMn high-entropy alloy journal January 2020
Cold Gas Spraying of a High-Entropy CrFeNiMn Equiatomic Alloy journal January 2020
Precipitation behavior of AlxCoCrFeNi high entropy alloys under ion irradiation journal August 2016
Science and technology in high-entropy alloys journal January 2018
Thermal stability of microstructures and mechanical properties in a Fe-based Fe-Cr-Mn-Cu-Mo multi-component alloy journal February 2019
Study on the damping behaviour of eutectic high-entropy alloys with lamellar structures journal June 2019
Computational characterization of the structural and mechanical properties of Al x CoCrFeNiTi 1− x high entropy alloys journal July 2019
Origin of radiation resistance in multi-principal element alloys journal October 2018
Evaluation of Radiation Response in CoCrFeCuNi High-Entropy Alloys journal October 2018
Thermal Stability and Mechanical Properties of Low-Activation Single-Phase Ti-V-Ta Medium Entropy Alloys journal August 2019
High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys journal August 2019
Fabrication of ODS Austenitic Steels and CoCrFeNi High-Entropy Alloys by Spark Plasma Sintering for Nuclear Energy Applications journal May 2019
Effect of irradiation on microstructure and hardening of Cr–Fe–Ni–Mn high-entropy alloy and its strengthened version journal December 2019
Configurational Entropy in Multicomponent Alloys: Matrix Formulation from Ab Initio Based Hamiltonian and Application to the FCC Cr-Fe-Mn-Ni System journal January 2019
Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys journal November 2016
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Effects of chemical alternation on damage accumulation in concentrated solid-solution alloys journal June 2017
Proton Irradiation Effects on Hardness and the Volta Potential of Welding 308L Duplex Stainless Steel journal December 2018

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