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Title: Constitutive Law and Flow Mechanism in Diamond Deformation

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. In this paper, 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. Finally, at high temperature the plastic deformation and ductile flow is meditated by the <110>{111} dislocation glide and a very active {111} micro-twinning.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). LANSCE Lujan Center
  2. Univ. Lille 1, Villeneuve d'Ascq (France). Materials and Transformations Unit
  3. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy. High Pressure Science and Engineering Center (HiPSEC)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). LANSCE Lujan Center; Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy. High Pressure Science and Engineering Center (HiPSEC)
Publication Date:
Report Number(s):
LA-UR-13-21226
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396; FC52-06NA27684; EAR 01-35554
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 2; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Conseil Regional du Nord-Pas de Calais (France); European Regional Development Fund (ERDF); Inst. National des Sciences de l'Univers (INSU, CNRS) (France)
Contributing Orgs:
Univ. of Nevada, Las Vegas, NV (United States); Univ. Lille 1, Villeneuve d'Ascq (France)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; applied physics; materials science; mechanical engineering; mineralogy
OSTI Identifier:
1321726