کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1446603 | 988616 | 2012 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Elastic properties of β-eucryptite in the glassy and microcracked crystalline states Elastic properties of β-eucryptite in the glassy and microcracked crystalline states](/preview/png/1446603.png)
Amorphous and crystalline β-eucryptite (LiAlSiO4) 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.
Journal: Acta Materialia - Volume 60, Issue 16, September 2012, Pages 5867–5876