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Title: Reaction of amorphous/crystalline SiOC/Fe interfaces by thermal annealing

Journal Article · · Acta Materialia
ORCiD logo [1];  [2];  [3];  [3];  [4];  [5];  [6];  [3];  [3]; ORCiD logo [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Texas A & M Univ., College Station, TX (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Davis, CA (United States)

The development of revolutionary new alloys and composites is crucial to meeting materials requirements for next generation nuclear reactors. The newly developed amorphous silicon oxycarbide (SiOC) and crystalline Fe composite system has shown radiation tolerance over a wide range of temperatures. To advance understanding of this new composite, we investigate the structure and thermal stability of the interface between amorphous SiOC and crystalline Fe by combining various experimental techniques and simulation methods. We show that the SiOC/Fe interface is thermally stable up to at least 400 °C. When the annealing temperature reaches 600 °C, an intermixed region forms at this interface. This region appears to be a crystalline phase that forms an incoherent interface with the Fe layer. Density functional theory (DFT) Molecular dynamics (MD) is performed on the homogeneous SiFeOC phase to study the early stages of 2 formation of the intermixed layer. Both experimental and simulation results suggest this phase has the fayalite crystal structure. As a result, the physical processes involved in the formation of the intermixed region are discussed.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Argonne National Laboratory, Advanced Photon Source; USDOE Office of Nuclear Energy (NE), Nuclear Energy Enabling Technologies (NEET); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; NE0000533; SC0012704; AC52-06NA25396; AC02-05CH11231
OSTI ID:
1372391
Alternate ID(s):
OSTI ID: 1392212; OSTI ID: 1550350
Report Number(s):
BNL-114110-2017-JA; 136394
Journal Information:
Acta Materialia, Vol. 135, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Mechanical Response of He-Implanted Amorphous SiOC/Crystalline Fe Nanolaminates journal March 2019
Resistance to Helium Bubble Formation in Amorphous SiOC/Crystalline Fe Nanocomposite journal December 2018
Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite journal March 2019
Mechanical Response of He-Implanted Amorphous SiOC/Crystalline Fe Nanolaminates journal March 2019
Resistance to Helium Bubble Formation in Amorphous SiOC/Crystalline Fe Nanocomposite journal December 2018