Published July 19, 2019 | Version v1
Journal article Metadata-only

Thermal stability and irradiation response of nanocrystalline CoCrCuFeNi high-entropy alloy

Creators

  • 1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
  • 2. School of Computing and Engineering, University of Huddersfield, Huddersfield, HD1 3DH (United Kingdom)
  • 3. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996 (United States)
  • 4. Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 (United States)

Description

Grain growth and phase stability of a nanocrystalline face-centered cubic (fcc) Ni0.2Fe0.2Co0.2Cr0.2Cu0.2 high-entropy alloy (HEA), either thermally- or irradiation-induced, are investigated through in situ and post-irradiation transmission electron microscopy (TEM) characterization. Synchrotron and lab x-ray diffraction measurements are carried out to determine the microstructural evolution and phase stability with improved statistics. Under in situ TEM observation, the fcc structure is stable at 300 °C with a small amount of grain growth from 15.8 to ∼20 nm being observed after 1800 s. At 500 °C, however, some abnormal growth activities are observed after 1400 s, and secondary phases are formed. Under 3 MeV Ni room temperature ion irradiation up to an extreme dose of nearly 600 displacements per atom, the fcc phase is stable and the average grain size increases from 15.6 to 25.2 nm. Grain growth mechanisms driven by grain rotation, grain boundary curvature, and disorder are discussed. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1361-6528/ab1605

Additional details

Identifiers

DOI
10.1088/1361-6528/ab1605;

Publishing Information

Journal Title
Nanotechnology (Print)
Journal Volume
30
Journal Issue
29
Journal Page Range
[15 p.]
ISSN
0957-4484

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
51050964
Subject category
S77: NANOSCIENCE AND NANOTECHNOLOGY;
Descriptors DEI
ALLOYS; ATOMIC DISPLACEMENTS; FCC LATTICES; GRAIN BOUNDARIES; GRAIN GROWTH; IRRADIATION; MEV RANGE; NANOCRYSTALS; PHASE STABILITY; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION
Descriptors DEC
COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; CUBIC LATTICES; DIFFRACTION; ELECTRON MICROSCOPY; ENERGY RANGE; MICROSCOPY; MICROSTRUCTURE; NANOSTRUCTURES; PHYSICAL RADIATION EFFECTS; RADIATION EFFECTS; SCATTERING; STABILITY; TEMPERATURE RANGE; THREE-DIMENSIONAL LATTICES