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Title: X-ray Diffraction Study of the Static Strength of tungsten to 69 Gpa

Abstract

The strength of tungsten was determined under static high pressures to 69 GPa using x-ray diffraction techniques in a diamond anvil cell. Analysis of x-ray diffraction peak broadening and measurement of peak shifts associated with lattice strains are two different methods for strength determination of materials under large nonhydrostatic compressions. Here these methods are directly compared under uniaxial compression in a diamond anvil cell. Our results demonstrate the consistency of the two approaches, and show that the yield strength of tungsten increases with compression, reaching a value of 5.3 GPa at the highest pressure. The obtained yield strength of tungsten is also compared with previous experimental data involving shock wave and static compression measurements, and with theoretical predictions. The high-pressure strength of tungsten is comparable to that of other dense metals such as Re and Mo, and ratio of yield strength to shear modulus is about 0.02 for all these materials between 20 and 70 GPa. The static strength of tungsten is much greater than values observed for W under shock loading but is very similar to values observed under quasi-isentropic loading.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914171
Report Number(s):
BNL-78739-2007-JA
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US0801593
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B; Journal Volume: 73
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; COMPRESSION; DIAMONDS; SHEAR; SHOCK WAVES; STRAINS; TUNGSTEN; X-RAY DIFFRACTION; YIELD STRENGTH; NSLS; national synchrotron light source

Citation Formats

He,D., and Duffy, T.. X-ray Diffraction Study of the Static Strength of tungsten to 69 Gpa. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.73.134106.
He,D., & Duffy, T.. X-ray Diffraction Study of the Static Strength of tungsten to 69 Gpa. United States. doi:10.1103/PhysRevB.73.134106.
He,D., and Duffy, T.. Sun . "X-ray Diffraction Study of the Static Strength of tungsten to 69 Gpa". United States. doi:10.1103/PhysRevB.73.134106.
@article{osti_914171,
title = {X-ray Diffraction Study of the Static Strength of tungsten to 69 Gpa},
author = {He,D. and Duffy, T.},
abstractNote = {The strength of tungsten was determined under static high pressures to 69 GPa using x-ray diffraction techniques in a diamond anvil cell. Analysis of x-ray diffraction peak broadening and measurement of peak shifts associated with lattice strains are two different methods for strength determination of materials under large nonhydrostatic compressions. Here these methods are directly compared under uniaxial compression in a diamond anvil cell. Our results demonstrate the consistency of the two approaches, and show that the yield strength of tungsten increases with compression, reaching a value of 5.3 GPa at the highest pressure. The obtained yield strength of tungsten is also compared with previous experimental data involving shock wave and static compression measurements, and with theoretical predictions. The high-pressure strength of tungsten is comparable to that of other dense metals such as Re and Mo, and ratio of yield strength to shear modulus is about 0.02 for all these materials between 20 and 70 GPa. The static strength of tungsten is much greater than values observed for W under shock loading but is very similar to values observed under quasi-isentropic loading.},
doi = {10.1103/PhysRevB.73.134106},
journal = {Phys. Rev. B},
number = ,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • The strength of tungsten was determined under static high pressures to 69 GPa using x-ray diffraction techniques in a diamond anvil cell. Analysis of x-ray diffraction peak broadening and measurement of peak shifts associated with lattice strains are two different methods for strength determination of materials under large nonhydrostatic compressions. Here these methods are directly compared under uniaxial compression in a diamond anvil cell. Our results demonstrate the consistency of the two approaches, and show that the yield strength of tungsten increases with compression, reaching a value of 5.3 GPa at the highest pressure. The obtained yield strength of tungstenmore » is also compared with previous experimental data involving shock wave and static compression measurements, and with theoretical predictions. The high-pressure strength of tungsten is comparable to that of other dense metals such as Re and Mo, and ratio of yield strength to shear modulus is about 0.02 for all these materials between 20 and 70 GPa. The static strength of tungsten is much greater than values observed for W under shock loading but is very similar to values observed under quasi-isentropic loading.« less
  • X-ray diffraction measurement determined that a newly synthesized nanocrystalline tungsten nitride (W{sub 2}N) has a substantially larger cell parameter than its bulk material. Yet the lattice of a metal nanocrystalline tungsten (W) remained unchanged. High-pressure diffraction study to 31 GPa resolved a much lower bulk modulus of 240 GPa for nanocrystalline W{sub 2}N and a relatively unchanged bulk modulus of 307 GPa for nanocrystalline W compared to its bulk material. We found that the metallic bonding of a metal is not affected by reduction of the grain size. The enlarged cell parameter and the relatively low bulk modulus of W{submore » 2}N reflect the size effect of nanocrystalline W{sub 2}N.« less
  • In this study, we have developed a general X-ray powder diffraction (XPD) methodology for the simultaneous structural and compositional characterization of inorganic nanomaterials. The approach is validated on colloidal tungsten oxide nanocrystals (WO 3-x NCs), as a model polymorphic nanoscale material system. Rod-shaped WO 3-x NCs with different crystal structure and stoichiometry are comparatively investigated under an inert atmosphere and after prolonged air exposure. An initial structural model for the as-synthesized NCs is preliminarily identified by means of Rietveld analysis against several reference crystal phases, followed by atomic pair distribution function (PDF) refinement of the best-matching candidates (static analysis). Subtlemore » stoichiometry deviations from the corresponding bulk standards are revealed. NCs exposed to air at room temperature are monitored by XPD measurements at scheduled time intervals. The static PDF analysis is complemented with an investigation into the evolution of the WO 3-x NC structure, performed by applying the modulation enhanced diffraction technique to the whole time series of XPD profiles (dynamical analysis). Prolonged contact with ambient air is found to cause an appreciable increase in the static disorder of the O atoms in the WO 3-x NC lattice, rather than a variation in stoichiometry. Finally, the time behavior of such structural change is identified on the basis of multivariate analysis.« less
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