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Title: Manufacturing and characterization of Ni-free N-containing ODS austenitic alloys

Ni-free N-containing oxide dispersion strengthened (ODS) austenitic alloys were manufactured by mechanical alloying (MA) followed by spark plasma sintering (SPS). The phase evolutions during milling under a nitrogen atmosphere and after sintering were studied by X-ray diffraction (XRD). Transmission electron microcopy (TEM) and contrast variation analysis (ACV), including small-angle neutron scattering (SANS) and ultra-small X-ray scattering (USAXS), revealed the existence of nanoparticles with a diameter of 3-51 nm for the samples sintered at 950 ºC. Sintering at 1000 ºC for 5 and 15 min caused slight growth and a significant coarsening of the nanoparticles, up to 70 nm and 128 nm, respectively. The ACV analysis indicated the existence of two populations of Y2O3, ε-martensite and MnO. The dispersive X-ray spectrometry (EDS) confirmed two kinds of nanoparticles, Y2O3 and MnO. The material was characterized by superior micro-hardness, of above 500 HV0.1.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [2] ;  [5] ;  [2] ;  [6]
  1. National Inst. for Materials Science (NIMS), Tsukuba (Japan); Warsaw Univ. of Technology (WUT), Warsaw (Poland)
  2. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  3. Hokkaido Univ., Sapporo (Japan). Faculty of Engineering
  4. Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
  5. Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai-mura, Naka-gun (Japan)
  6. Warsaw Univ. of Technology (WUT), Warsaw (Poland)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 501; Journal ID: ISSN 0022-3115
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; Warsaw University of Technology (Politechnika Warszawska)
Country of Publication:
United States
36 MATERIALS SCIENCE; Mechanical alloying; Nanoparticle; ODS austenitic steel; Small-angle neutron scattering (SANS); Spark plasma sintering (SPS); contrast variation analysis
OSTI Identifier: