TY - CONF A1 - Pönitzsch, A. A1 - Rodriques, B.P. A1 - Deubener, J. A1 - Wondraczek, L. A1 - Nofz, Marianne T1 - Micromechanical properties of glasses on the peraluminous-perearth-alkaline-join in the system CaO-Al2O3-SiO2 T2 - FFAG-6, 6th International Workshop on Flow and Fracture of Advanced Glasses CY - Weimar, Germany DA - 2014-10-07 PY - 2014 AN - OPUS4-32345 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pönitzsch, A. A1 - Nofz, Marianne A1 - Wondraczek, L. A1 - Deubener, J. T1 - Bulk elastic properties, hardness and fatigue of calcium aluminosilicate glasses in the intermediate-silica range N2 - Bulk elastic properties, hardness and fatigue of calcium aluminosilicate (CAS) glasses in the technically relevant region of the ternary with intermediate-silica fraction were determined by combining results of Vickers indentation, ultrasonic echography and Archimedian buoyancy at room temperature. Of three studied compositional series, the first series was along the meta-aluminous join, while in the two other series the molar fraction of SiO2 was kept constant. For the first series the elastic moduli and hardness show an almost linear increase with increasing SiO2 fraction. In contrast, increasing the CaO/SiO2 ratio at constant silica content results in a characteristic change when passing the meta-aluminous join. Elastic constants and hardness were lower at the percalcic than on the peraluminous side. Empirical models which relate bulk elastic moduli to internal energy, short-range inter-atomic forces and the packing density of their oxide constituents were found to be in agreement with the experimental data for meta-aluminous glasses, while deviations between the observed and predicted trends were evident for percalcic compositions. Empirical fatigue parameters such as the probability to initiate cracks after indentation reflect the bulk mechanical properties in the CAS system when conducted in inert atmosphere, but are otherwise clearly dominated by environmental effects KW - Aluminosilicate glasses KW - Elastic constants KW - Indentation KW - Hardness KW - Crack initiation KW - Sub-critical crack-growth PY - 2016 U6 - https://doi.org/10.1016/j.jnoncrysol.2015.12.002 SN - 0022-3093 VL - 434 SP - 1 EP - 12 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-35243 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -