Nanocrystallization in spark plasma sintered Fe{sub 48}Cr{sub 15}Mo{sub 14}Y{sub 2}C{sub 15}B{sub 6} bulk amorphous alloy

Journal Article · Wed Aug 07 00:00:00 EDT 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4817379· OSTI ID:22218253

Singh, Ashish; Harimkar, Sandip P. ^[1]; Katakam, Shravana; Dahotre, Narendra B. ^[2]; Ilavsky, Jan ^[3]

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1. School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
2. Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203 (United States)
3. Advanced Photon Source, Argonne National Laboratory, Chicago, Illinois 60439 (United States)

Spark plasma sintering (SPS) is evolving as an attractive process for the processing of multi-component Fe-based bulk amorphous alloys and their in-situ nanocomposites with controlled primary nanocrystallization. Extended Q-range small angle neutron scattering (EQ-SANS) analysis, complemented by x-ray diffraction and transmission electron microscopy, was performed to characterize nanocrystallization behavior of SPS sintered Fe-based bulk amorphous alloys. The SANS experiments show significant scattering for the samples sintered in the supercooled region indicating local structural/compositional changes associated with the profuse nucleation of nanoclusters (∼4 nm). For the samples spark plasma sintered near and above crystallization temperature (>653 °C), the SANS data show the formation of interference maximum indicating the formation and growth of (Fe,Cr){sub 23}C{sub 6} crystallites. The SANS data also indicate the evolution of bimodal crystallite distribution at higher sintering temperatures (above T{sub x1}). The growth of primary nanocrystallites results in impingement of concentration gradient fields (soft impingement effect), leading to non-random nucleation of crystallites near the primary crystallization.

• OSTI ID: 22218253
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 5 Vol. 114; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
BORON ALLOYS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
CONCENTRATION RATIO
CRYSTALLIZATION
IMPINGEMENT
IRON ALLOYS
MOLYBDENUM ALLOYS
NANOSTRUCTURES
NEUTRON DIFFRACTION
NUCLEATION
PLASMA
SINTERING
SMALL ANGLE SCATTERING
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM ALLOYS