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Nalepka P.♦, Nalepka K.T., Pęcherski R.B., Analysis of deformation mechanisms in Cu /Al2O3 interfaces with the use of HRTEM images,
SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P243, pp.1-2, 2016Abstract: The composition of metal with ceramics is applied to many devices, structural elements of machines as well as their equipment. Therefore, evaluating the strength of interfaces of this type becomes an important scientific issue of fundamental character. Numerous attempts are made to solve the posed problem, both experimental and theoretical ones. The presented approach enables local, more precise determining the mechanical properties of interfaces. The basis of conducted calculations is the geometry of the interface strongly preferred by the considered system of materials. It is defined by the mutual orientation of crystallites of two phases and the position of the plane boundary. The combination of two advanced research methods: electron back-scatter diffraction (EBSD) and high resolution transmission electron microscopy (HRTEM) enables identification of this crucial characteristics. The second of them additionally reveals a representative microstructure of the interface in the form of a projection. We reconstruct it in three dimensions by means of molecular dynamics (MD) simulations. In this way, we identify deformation mechanisms that enable the formation of the bonding between the metallic phase and ceramic one. Keywords: nanocomposites, deformation in interface, HRTEM Affiliations:
Nalepka P. | - | Agriculture University in Krakow (PL) | Nalepka K.T. | - | IPPT PAN | Pęcherski R.B. | - | IPPT PAN |
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Pęcherski R.B., Nalepka K.T., Nalepka P.♦, Sztwiertnia K.♦, Kret S.♦, Ustrzycka A., Assessment of the strength of nanocomposites based on interface bonding analysis,
ICTAM XXIV, 24th International Congress of Theoretical and Applied Mechanics, 2016-08-21/08-26, Montréal (CA), pp.2384-2385, 2016Abstract: Recent investigations reveal that interface bonding strength is dependent on the relative orientation of crystallites of the both phases [2]. The experimental, theoretical and computational investigations confirm this observation in the case of Cu/Al2O3 system, [3], [4]. It is shown that the statistical distribution of the values of interface strength for different relative orientations of bonded phases should be included in the phenomenological model of the damage initiation in nanocomposites. The novelty of the presented study is the combination of different experimental techniques: HRTEM, EBSD and molecular dynamics simulations with phenomenological theory of damage development in nanocomposites due to debonding at the interphase boundary [5], [6], [7]. A class of new models with the yield condition determined by one of quadric surfaces, in particular paraboloid or ellipsoid one is considered and the comparison with popular Gurson approach is discussed, [8]. Keywords: nanocompistes, strength, interface, bonding, HRTEM, EBSD, molecular dynamics Affiliations:
Pęcherski R.B. | - | IPPT PAN | Nalepka K.T. | - | IPPT PAN | Nalepka P. | - | Agriculture University in Krakow (PL) | Sztwiertnia K. | - | other affiliation | Kret S. | - | Institute of Physics, Polish Academy of Sciences (PL) | Ustrzycka A. | - | IPPT PAN |
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Maździarz M., Nalepka K.T., Szymański Z., Hoffman J., Kret S.♦, Kucharski S., Nalepka P.♦, Atomistic Model of Decohesion of Copper-Corundum Interface,
SolMech 2012, 38th Solid Mechanics Conference, 2012-08-27/08-31, Warszawa (PL), pp.204-205, 2012 | |