Abstract
Amorphous and crystalline β-eucryptite (LiAlSiO 4) specimens were prepared with controlled grain sizes and varying levels of microcracking, and their elastic moduli were determined using resonant ultrasound spectroscopy. It was found that the relationship between Young's modulus, Poisson's ratio and degree of microcracking in these materials can be described well with fracture-mechanics-based models. It was also found that if glassy β-eucryptite is considered to be a microcracked medium in which broken Si-O bonds, with respect to the crystalline material, constitute microcracks, then its elastic properties can be described equally well by these models. Such considerations are explained by noting the differences in atomic bond density among the different states of the material and by accounting for differences in strain energy release rate measurements on glass and ceramic specimens.
| Original language | English |
|---|---|
| Pages (from-to) | 5867-5876 |
| Number of pages | 10 |
| Journal | Acta Materialia |
| Volume | 60 |
| Issue number | 16 |
| DOIs | |
| State | Published - Sep 2012 |
Funding
The authors thank Jim Webb of Corning Inc. for generously donating the glass material and sharing the devitrification procedures. The authors thank Giovanni Bruno of Corning and Prof. Richard Bradt of the University of Alabama for reviewing the paper and offering many helpful suggestions. We thank Robbie Meisner (ORNL) for X-ray diffraction measurements. Joseph Muth was a summer intern at ORNL when this work was performed. He is currently an undergraduate student in the Department of Materials Engineering at Purdue University, West Lafayette, IN 47907, USA. The research at the Oak Ridge National Laboratory’s High Temperature Materials Laboratory was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |
Keywords
- Ceramics
- Elastic behavior
- Fracture
- Modeling
- Silicates