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

21 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

Access to Document

10.1063/1.1866226

Cite this

@article{9a7db1fda6154efb99c75e1ca1e003f3,

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

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.",

author = "Levitas, {Valery I.} and Yanzhang Ma and Javad Hashemi",

note = "Funding Information: This work was supported by NSF (CMS-02011108) and Texas Tech Excellence Fund.",

year = "2005",

month = feb,

day = "14",

doi = "10.1063/1.1866226",

language = "English",

volume = "86",

pages = "1--3",

journal = "Applied Physics Letters",

issn = "0003-6951",

number = "7",

}

TY - JOUR

T1 - Transformation-induced plasticity and cascading structural changes in hexagonal boron nitride under high pressure and shear

AU - Levitas, Valery I.

AU - Ma, Yanzhang

AU - Hashemi, Javad

N1 - Funding Information: This work was supported by NSF (CMS-02011108) and Texas Tech Excellence Fund.

PY - 2005/2/14

Y1 - 2005/2/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=17044417743&partnerID=8YFLogxK

U2 - 10.1063/1.1866226

DO - 10.1063/1.1866226

M3 - Article

AN - SCOPUS:17044417743

VL - 86

SP - 1

EP - 3

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 7

M1 - 071912

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this