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Mechanical properties and microstructures of metal/ceramic microlaminates: Part II. A Mo/Al2O3 system

Published online by Cambridge University Press:  31 January 2011

T.C. Chou ,
T.G. Nieh ,
S.D. McAdams ,
G.M. Pharr  and
W.C. Oliver
T.C. Chou
Affiliation:
Lockheed Missiles and Space Company, Inc., Research and Development Division, O/93-10, B/204, Palo Alto, California 94304
T.G. Nieh
Affiliation:
Lockheed Missiles and Space Company, Inc., Research and Development Division, O/93-10, B/204, Palo Alto, California 94304
S.D. McAdams
Affiliation:
Department of Materials Science, Rice University, P.O. Box 1892, Houston, Texas 77251
G.M. Pharr
Affiliation:
Department of Materials Science, Rice University, P.O. Box 1892, Houston, Texas 77251
W.C. Oliver
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
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Abstract

Synthetic multilayers consisting of periodic layers of the refractory metal Mo and the oxide ceramic Al2O3 have been produced by alternating d.c. and r.f. reactive sputter deposition. Microlaminates with four different modulation wavelength—5, 20, 30, and 100 nm—were investigated in this study. The compositions, periodicities, and microstructures of the microlaminates were characterized by Auger electron spectroscopy, low-angle x-ray diffraction, and transmission electron microscopy, including high resolution lattice imaging and microdiffraction. Transmission electron microscopy from the microlaminates indicated that the as-deposited Mo layers are polycrystalline, while the as-deposited Al2O3 layers are primarily amorphous. The Mo and Al2O3 layers are thermally compatible at 800 °C for 6 h, showing no evidence of atomic interdiffusion between the layers. The mechanical properties of the microlaminates, as well as those of monolithic films of Mo and Al2O3 (i.e., the baseline materials), were investigated using nanoindentation methods. A higher than expected modulus and hardness were observed for the microlaminate with the longest wavelength (100 nm); otherwise the mechanical properties are explainable by a rule-of-mixtures. The enhanced mechanical properties of the 100 nm microlaminate may be attributed to crystallization of the amorphous Al2O3 layers and the evolution of a structural texture within this phase.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2774 - 2784
Copyright
Copyright © Materials Research Society 1992

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