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Title: Primary and secondary precipitates in a hierarchical-precipitate-strengthened ferritic alloy

The microstructures of a hierarchical-precipitate-strengthened ferritic alloy are characterized, using transmission-electron microscopy (TEM) and atom-probe tomography (APT). The alloy shows duplex precipitates. The primary precipitate with an average edge length of 90 nm consists of NiAl- and Ni2TiAl-type phases, while the secondary precipitate with an average radius of 2 nm is a NiAl-type phase. Based on the APT results, the volume fractions of the primary and secondary precipitates were calculated, using the lever rule to be 17.3 and 2.3 %, respectively.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Tohoku Univ., Sendai (Japan)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 09NT0008089; FE0005868; FE-0011194; FE-0024054
Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 706; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Atom probe tomography; Ferritic steels; Heusler phases; Precipitation; Transmission electron microscopy (TEM)
OSTI Identifier:
1394433
Alternate Identifier(s):
OSTI ID: 1416039