Transformation-induced plasticity and cascading structural changes in hexagonal boron nitride under high pressure and shear

Valery I. Levitas; Yanzhang Ma; Javad Hashemi

doi:10.1063/1.1866226

Transformation-induced plasticity and cascading structural changes in hexagonal boron nitride under high pressure and shear

Valery I. Levitas, Yanzhang Ma, Javad Hashemi

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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	https://doi.org/10.1063/1.1866226
State	Published - Feb 14 2005

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