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

This work reports 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 Y{sub 2}O{sub 3}, fluorite Y{sub 2}O{sub 3}–HfO{sub 2} solid solution and pyrochlore (or fluorite) Y{sub 2}(Ti,Hf){sub 2−x}O{sub 7−x}. High resolution transmission electron microscopy was used to characterize the particle–matrix interfaces. 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. The 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. - Highlights: • The oxide nanoparticles in a hafnium-containing austenitic ODS were characterized. • The nanoparticles are Y–Hf–Ti–O enriched phases according to APT and STEM–EDS. • Two coherency and an axis-parallel orientation relationships were found by HR-TEM. • Particle size has a prominent effect on the orientation relationship (OR). • Formation mechanism of the oxide nanoparticlesmore » was discussed based on the ORs.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ; ;  [5] ; ;  [6] ;  [7] ;  [8] ;  [4] ;  [1]
  1. Department of Nuclear, Plasma and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)
  2. Nuclear Engineering Division, Argonne National Laboratory, Lemont, IL 60493 (United States)
  3. Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588 (United States)
  4. (United States)
  5. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37830 (United States)
  6. Department of Material Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)
  7. X-ray Science Division, Argonne National Laboratory, Lemont, IL 60493 (United States)
  8. Department of Material Science and Engineering, University of Wisconsin-Madison, Madison, WA 53706 (United States)
Publication Date:
OSTI Identifier:
22476058
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 101; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITIC STEELS; CRYSTAL STRUCTURE; ELECTRONS; FLUORITE; HAFNIUM; HAFNIUM COMPOUNDS; INTERFACES; NANOPARTICLES; OXIDES; PARTICLE SIZE; PYROCHLORE; RESOLUTION; SOLID SOLUTIONS; STAINLESS STEELS; SYNCHROTRON RADIATION; TITANIUM COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY; YTTRIUM COMPOUNDS