Orientation dependence of indentation behavior in Al–SiC nanolaminate composites

Al and SiC nanolaminate films were characterized in the perpendicular, inclined and parallel orientations using nanoindentation. The deformation was dominated by buckling of the layers when the layers were parallel to the indenter and by compression of the ductile Al layers when the layers were perp...

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Bibliographic Details
Published in:Materials letters 2016-04, Vol.168 (C), p.129-133
Main Authors: Mayer, C., Yang, L.W., Singh, S.S., Xie, H., Shen, Y.-L., Llorca, J., Molina-Aldareguia, J., Chawla, N.
Format: Article
Language:English
Subjects:
Aluminum
Anisotropy
Buckling
Deformation
Finite element method
Finite element modeling
Indentation
Indenters
MATERIALS SCIENCE
Multilayer
Nanoindentation
Nanolaminate
Nanostructure
Orientation
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Summary:Al and SiC nanolaminate films were characterized in the perpendicular, inclined and parallel orientations using nanoindentation. The deformation was dominated by buckling of the layers when the layers were parallel to the indenter and by compression of the ductile Al layers when the layers were perpendicular to the indenter, while indentation in inclined orientations showed an intermediate behavior. Finite element modeling (FEM) of indentation deformation using wavy layers showed much more compliant behavior and prominent layer buckling than the idealized flat structure, highlighting the large effect these microstructural details can have on the deformation behavior. •The properties of nanolaminates are highly anisotropic.•Multiaxial stress state under indenter has implications for anisotropic structures.•Layer curvature reduces stiffness of multilayer in all orientations.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2016.01.049