Prediction of the composition dependence of Calcium aluminosilicate (CAS) glasses mechanical properties is essential to aid in the development of new glasses with tuned properties for specific applications. In this investigation, we use microindentation to measure the hardness (H) and modulus (M) and the inelastic volume that dissipates the inelastic energy is elucidated using annealing and AFM to decompose it into contributions from densification and shear flow. We chose a family of CAS glasses with a constant CaO/Al₂O₃ ratio but varying SiO₂ content, as well as a commercial >99% SiO₂ glass. We observe a decoupling between M & H, M systematically decreases upon increasing SiO₂ content, however, H exhibits a non-monotonic behavior with a minimum around 79% SiO₂. The inelastically deformed volumes show a high contribution from shear flow for SiO₂-poor glasses and a high contribution of densification for SiO₂-rich glasses, demonstrating a shear to densification dominated transition between these two extremes.

铝硅酸钙（CAS）玻璃机械性能的成分依赖性预测对于协助开发具有针对特定应用调整的性能的新型玻璃至关重要。在这项研究中，我们使用微观压痕来测量硬度（H）和模量（M），并通过退火和AFM阐明了耗散非弹性能的非弹性体积，从而将其分解为致密化和剪切流的贡献。我们选择了具有恒定CaO / Al ₂ O ₃比但SiO ₂含量变化的CAS玻璃系列，以及商用的> 99％SiO ₂玻璃。我们观察到M＆H，M之间的解耦SiO ₂含量的增加会系统地降低，但是H表现出非单调性，SiO ₂的最小值约为79％。所述非弹性变形量表示从剪切流高贡献的SiO _2个国定贫困眼镜和致密化的一氧化硅高的贡献_2个富眼镜，表明剪切到这两个极端之间的致密化为主的过渡。