Title :

Constitutive Law and Flow Mechanism in Diamond Deformation

Author(s) :

Yu, Xioahui [Auteur]
Los Alamos National Laboratory [LANL]
Raterron, Paul [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Zhang, Jianzhong [Auteur]
Los Alamos National Laboratory [LANL]
Lin, Zhijun [Auteur]
Los Alamos National Laboratory [LANL]
Wang, Liping [Auteur]
University of Nevada [Las Vegas] [WGU Nevada]
Zhao, Yusheng [Auteur]
Los Alamos National Laboratory [LANL]
University of Nevada [Las Vegas] [WGU Nevada]

Journal title :

Scientific reports

Volume number :

2

Pages :

876

Publication date :

2012

HAL domain(s) :

Planète et Univers [physics]/Astrophysique [astro-ph]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]

English abstract : [en]

Constitutive laws and crystal plasticity in diamond deformation have been the subjects of substantial interest since synthetic diamond was made in 1950's. To date, however, little is known quantitatively regarding its ...
Show more >Constitutive laws and crystal plasticity in diamond deformation have been the subjects of substantial interest since synthetic diamond was made in 1950's. To date, however, little is known quantitatively regarding its brittle-ductile properties and yield strength at high temperatures. Here we report, for the first time, the strain-stress constitutive relations and experimental demonstration of deformation mechanisms under confined high pressure. The deformation at room temperature is essentially brittle, cataclastic and mostly accommodated by fracturing on {111} plane with no plastic yielding at uniaxial strains up to 15%. At elevated temperatures of 1000°C and 1200°C diamond crystals exhibit significant ductile flow with corresponding yield strength of 7.9 and 6.3 GPa, indicating that diamond starts to weaken when temperature is over 1000°C. At high temperature the plastic deformation and ductile flow is meditated by the <110>{111} dislocation glide and a very active {111} micro-twinning.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2019-05-16T15:31:08Z
2020-03-26T10:43:32Z