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Title: The interfacial orientation relationship of oxide nanoparticles in a hafnium-containing oxide dispersion-strengthened austenitic stainless steel

We report comprehensive investigations on the orientation relationship of the oxide nanoparticles in a hafnium-containing austenitic oxide dispersion-strengthened 316 stainless steel. The phases of the oxide nanoparticles were determined by a combination of scanning transmission electron microscopy–electron dispersive X-ray spectroscopy, atom probe tomography and synchrotron X-ray diffraction to be complex Y–Ti–Hf–O compounds with similar crystal structures, including bixbyite Y2O3, fluorite Y2O3–HfO2 solid solution and pyrochlore (or fluorite) Y2(Ti,Hf)2 - xO7 - x. High resolution transmission electron microscopy was used to characterize the particle–matrix interfaces. Moreover, two different coherency relationships along with one axis-parallel relation between the oxide nanoparticles and the steel matrix were found. The size of the nanoparticles significantly influences the orientation relationship. Our results provide insight into the relationship of these nanoparticles with the matrix, which has implications for interpreting material properties as well as responses to radiation.
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4] ;  [1] ;  [1] ;  [2] ;  [5] ;  [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Nebraska, Lincoln, NE (United States); Univ. of Illinois, Urbana-Champaign, IL (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Wisconsin, Madison, WI (United States); Univ. of Illinois, Urbana-Champaign, IL (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; DEFG02-07ER46453; FG02-07ER46471
Accepted Manuscript
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 101; Journal Issue: C; Journal ID: ISSN 1044-5803
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; Structure materials; ODS; Atom probe tomography; TEM; Synchrotron diffraction; Orientation relationship
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1359521