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Title: Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding

Solid state joining is achieved in three steps, (i) interface asperity deformation, (ii) oxide dispersion, followed by (iii) atomic contact and bonding. Atomically clean metallic surfaces without an oxide layer bond spontaneously. Despite its importance the oxide dispersion mechanism is not well studied. In this work the first ever atom probe study of iron-aluminum solid state welds show that the oxygen concentration at the interface is 20 at.%. This is significantly lower than any equilibrium oxide concentration. Here, we therefore propose that the high-strain rate deformation at the interfaces renders the oxide unstable resulting in the observed concentration of oxygen.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 130; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solid state welding; oxide dispersion; atom probe tomography
OSTI Identifier:
1356891
Alternate Identifier(s):
OSTI ID: 1398046

Sridharan, Niyanth, Isheim, D., Seidman, David N., and Babu, Suresh S.. Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding. United States: N. p., Web. doi:10.1016/j.scriptamat.2016.11.040.
Sridharan, Niyanth, Isheim, D., Seidman, David N., & Babu, Suresh S.. Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding. United States. doi:10.1016/j.scriptamat.2016.11.040.
Sridharan, Niyanth, Isheim, D., Seidman, David N., and Babu, Suresh S.. 2016. "Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding". United States. doi:10.1016/j.scriptamat.2016.11.040. https://www.osti.gov/servlets/purl/1356891.
@article{osti_1356891,
title = {Colossal super saturation of oxygen at the iron-aluminum interfaces fabricated using solid state welding},
author = {Sridharan, Niyanth and Isheim, D. and Seidman, David N. and Babu, Suresh S.},
abstractNote = {Solid state joining is achieved in three steps, (i) interface asperity deformation, (ii) oxide dispersion, followed by (iii) atomic contact and bonding. Atomically clean metallic surfaces without an oxide layer bond spontaneously. Despite its importance the oxide dispersion mechanism is not well studied. In this work the first ever atom probe study of iron-aluminum solid state welds show that the oxygen concentration at the interface is 20 at.%. This is significantly lower than any equilibrium oxide concentration. Here, we therefore propose that the high-strain rate deformation at the interfaces renders the oxide unstable resulting in the observed concentration of oxygen.},
doi = {10.1016/j.scriptamat.2016.11.040},
journal = {Scripta Materialia},
number = C,
volume = 130,
place = {United States},
year = {2016},
month = {12}
}