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Microstructural Instability in Mosi2/Sic Nanolayers

Published online by Cambridge University Press:  02 July 2020

Y.C. Lu
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM87545
H. Kung
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM87545
J-P Hirvonen
Affiliation:
Joint Research Centre, Petten, The Netherlands
T.R. Jervis
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM87545
M. Nastasi
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM87545
D. Ruck
Affiliation:
GSI, Germany
T. E. Mitchell
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM87545

Extract

Thin film multilayers have been the focus of extensive studies recently due to the interesting properties they exhibit. Since the improvement in properties can be attributed directly to the unique nanoscale microstructures, it is essential to understand the factors affecting the microstructural stability in these nanolayer structures. The intermetallic compound, MoSi2, despite its superior oxidation resistance and high melting point, suffers from inadequate high temperature strength and low temperature ductility, properties which hinder its high temperature structural applications [1]. SiC is a potential second phase reinforcement due to its high temperature strength and thermal compatibility with MoSi2. The addition of SiC in a nanolayered configuration has been shown to exhibit significant increase in hardness after annealing [2]. It has also been shown that when annealed above 900°C, the layers break down and grain growth sets in, with a significant decrease in hardness and. Due to the lack of a thermochemical driving force, the two phases remain separate at all temperatures investigated. In this study, the stability of the MoSi2/SiC nanolayers structure under ion irradiation has been investigated.

Type
Nanocrystals and Nanocomposites: Novel Structures For Catalysis, Electronics, and Micromechanics
Copyright
Copyright © Microscopy Society of America 1997

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References

Petrovic, J.J., MRS Bulletin, Vol. XVIII, July 1993, p.35.10.1557/S0883769400037519CrossRefGoogle Scholar
Kung, H., Jervis, T.R., Hirvonen, J-P., Mitchell, T.E., Embury, J.D., and Nastasi, M., Phil. Mag. A71, 759 (1995).10.1080/01418619508236219CrossRefGoogle Scholar
Ziegler, J.F., Biersack, J.P., and Littmark, U., “The stopping and range of ions in solids”, Pergamon Press, New York, 1985.Google Scholar
Lu, Y.C., Kung, H., Jervis, T.R., Hirvonen, J-P., Ruck, D., Mitchell, T.E., and Nastasi, M., submitted to Nuclear Instrument and Methods B.Google Scholar
This research is funded through a Los Alamos LDRD program and the Director-funded postdoc program by the United States DOE under Contract W-7405-ENG-36.Google Scholar

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