Abstract
In situ x-ray diffraction study and modeling of the degree of disorder, s, and phase transformation (PT) in hexagonal hBN were performed. It was proven that changes in s are strain-induced and that s can be used to quantify plastic strain. During the strain-induced hBN→wurtzitic wBN PT, the transformation-induced plasticity (TRIP) was exposed and quantified. TRIP exceeds conventional plasticity by a factor of 20. Cascading structural changes were revealed. Strain-induced disorder explains why PT under hydrostatic and nonhydrostatic conditions started at the same pressure ∼10 GPa. For the same disorder, plastic shear reduces PT pressure by a factor of 3-4.
| Original language | English |
|---|---|
| Article number | 071912 |
| Pages (from-to) | 1-3 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 86 |
| Issue number | 7 |
| DOIs | |
| State | Published - Feb 14 2005 |
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Levitas, V. I., Ma, Y., & Hashemi, J. (2005). Transformation-induced plasticity and cascading structural changes in hexagonal boron nitride under high pressure and shear. Applied Physics Letters, 86(7), 1-3. [071912]. https://doi.org/10.1063/1.1866226