Mechanical properties of metal-ceramic nanolaminates: Effect of constraint and temperature

Yang, Ling Wei; Mayer, Carl; Li, Nan; Baldwin, Jon Kevin Scott; Mara, Nathan Allan; Chawla, Nikhilesh; Molina-Aldareguia, Jon M.; Llorca, Javier

doi:10.1016/j.actamat.2017.09.042

Mechanical properties of metal-ceramic nanolaminates: Effect of constraint and temperature

Journal Article · Thu Sep 21 00:00:00 EDT 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.09.042· OSTI ID:1417175

Yang, Ling Wei ^[1]; Mayer, Carl ^[2]; ^[3]; ^[3]; ^[3]; Chawla, Nikhilesh ^[2]; ^[4]; Llorca, Javier ^[1]

IMDEA Materials Institute, Madrid (Spain); Polytechnic Univ. of Madrid/Univ. Politecnica de Madrid, Madrid (Spain)
Arizona State Univ., Tempe, AZ (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
IMDEA Materials Institute, Madrid (Spain)

Al/SiC nanolaminates with equal nominal thicknesses of the Al and SiC layers (10, 25, 50 and 100 nm) were manufactured by magnetron sputtering. The mechanical properties were measured at 25 °C and 100 °C by means of nanoindentation and micropillar compression tests and the deformation mechanisms were analyzed by in situ micropillar compression tests in the transmission electron microscope. In addition, finite element simulations of both tests were carried out to ascertain the role played by the strength of the Al layers and by the elastic constraint of the ceramic layers on the plastic flow of Al in the mechanical response. It was found that the mechanical response was mainly controlled by the constraint during nanoindentation or micropillar compression tests of very thin layered (≈10 nm) laminates, while the influence of the strength of Al layers was not as critical. This behavior was reversed, however, for thick layered laminates (100 nm). Here, these mechanisms point to the different effects of layer thickness during nanoindentation and micropillar compression, at both temperatures, and showed the critical role played by constraint on the mechanical response of nanolaminates made of materials with a very large difference in the elasto-plastic properties.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1417175

Alternate ID(s):: OSTI ID: 1495895

Report Number(s):: LA-UR--17-28798

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 142; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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