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Microstructural Instability in Mosi2/Sic Nanolayers

Published online by Cambridge University Press:  02 July 2020

Y.C. Lu ,
H. Kung ,
J-P Hirvonen ,
T.R. Jervis ,
M. Nastasi ,
D. Ruck  and
T. E. Mitchell
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
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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
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 399 - 400
Copyright
Copyright © Microscopy Society of America 1997

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References

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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