Micromechanical and in situ shear testing of Al–SiC nanolaminate composites in a transmission electron microscope (TEM)

Mayer, Carl; Li, Nan; Mara, Nathan Allan; Chawla, Nikhilesh

doi:10.1016/j.msea.2014.10.055

Title: Micromechanical and in situ shear testing of Al–SiC nanolaminate composites in a transmission electron microscope (TEM)

Journal Article · Fri Nov 07 00:00:00 EST 2014 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2014.10.055· OSTI ID:1239249

Mayer, Carl ^[1]; Li, Nan ^[2]; Mara, Nathan Allan ^[2]; Chawla, Nikhilesh ^[1]

Arizona State Univ., Tempe, AZ (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Nanolaminate composites show promise as high strength and toughness materials. Still, due to the limited volume of these materials, micron scale mechanical testing methods must be used to determine the properties of these films. To this end, a novel approach combining a double notch shear testing geometry and compression with a flat punch in a nanoindenter was developed to determine the mechanical properties of these films under shear loading. To further elucidate the failure mechanisms under shear loading, in situ TEM experiments were performed using a double notch geometry cut into the TEM foil. Aluminum layer thicknesses of 50nm and 100nm were used to show the effect of constraint on the deformation. Higher shear strength was observed in the 50 nm sample (690±54 MPa) compared to the 100 nm sample (423±28.7 MPa). Additionally, failure occurred along the Al-SiC interface in the 50 nm sample as opposed to failure within the Al layer in the 100 nm sample.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: DMR-1209928; AC52-06NA25396

OSTI ID:: 1239249

Alternate ID(s):: OSTI ID: 1360844

Report Number(s):: LA-UR-14-27880; PII: S0921509314012982

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 621; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Web of Science

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Microscale shear specimens for evaluating the shear deformation in single-crystal and nanocrystalline Cu and at Cu–Si interfaces Gigax, Jonathan G.; Baldwin, Jon K.; Sheehan, Chris J. Journal of Materials Research, Vol. 34, Issue 9 https://doi.org/10.1557/jmr.2019.104	journal	April 2019
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