skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1410730
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; Related Information: CHORUS Timestamp: 2017-11-30 10:02:49; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., and Park, J. -S.. Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.174116.
Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., & Park, J. -S.. Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials. United States. doi:10.1103/PhysRevB.96.174116.
Beaudoin, A. J., Shade, P. A., Schuren, J. C., Turner, T. J., Woodward, C., Bernier, J. V., Li, S. F., Dimiduk, D. M., Kenesei, P., and Park, J. -S.. 2017. "Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials". United States. doi:10.1103/PhysRevB.96.174116.
@article{osti_1410730,
title = {Bright x-rays reveal shifting deformation states and effects of the microstructure on the plastic deformation of crystalline materials},
author = {Beaudoin, A. J. and Shade, P. A. and Schuren, J. C. and Turner, T. J. and Woodward, C. and Bernier, J. V. and Li, S. F. and Dimiduk, D. M. and Kenesei, P. and Park, J. -S.},
abstractNote = {},
doi = {10.1103/PhysRevB.96.174116},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 30, 2018
Publisher's Accepted Manuscript

Save / Share:
  • Copper-based high strength and high electrical conductivity nano-composite wires reinforced by Nb nano-tubes are prepared by severe plastic deformation, applied with an Accumulative Drawing and Bundling process (ADB), for the windings of high pulsed magnets. The ADB process leads to a multi-scale Cu matrix containing up to N = 85{sub 4} (52.2.10{sup 6}) continuous parallel Nb tubes with diameter down to few tens nano-meters. After heavy strain, the Nb nano-tubes exhibit a homogeneous microstructure with grain size below 100 nm. The Cu matrix presents a multi-scale microstructure with multi-modal grain size distribution from the micrometer to the nano-meter range. Themore » use of complementary characterization techniques at the microscopic and macroscopic level (in-situ tensile tests in the TEM, nano-indentation, in-situ tensile tests under high energy synchrotron beam) shed light on the interest of the multi-scale nature of the microstructure to achieve extreme mechanical properties, therefore allowing for design guidelines to further improve these properties. (authors)« less
  • To reveal the operating mechanisms of plastic deformation in an FCC high-entropy alloy, the activation volumes in CrMnFeCoNi have been measured as a function of plastic strain and temperature between 77 K and 423 K using repeated load relaxation experiments. At the yield stress, σ y, the activation volume varies from ~60 b3 at 77 K to ~360 b 3 at 293 K and scales inversely with yield stress. With increasing plastic strain, the activation volume decreases and the trends follow the Cottrell-Stokes law, according to which the inverse activation volume should increase linearly with σ - σ y (Haasenmore » plot). This is consistent with the notion that hardening due to an increase in the density of forest dislocations is naturally associated with a decrease in the activation volume because the spacing between dislocations decreases. The values and trends in activation volume agree with theoretical predictions that treat the HEA as a high-concentration solid-solution-strengthened alloy. Lastly, these results demonstrate that this HEA deforms by the mechanisms typical of solute strengthening in FCC alloys, and thus indicate that the high compositional/structural complexity does not introduce any new intrinsic deformation mechanisms.« less
  • Purpose: Beam range control is the essence of radiotherapy with heavy charged particles. In conventional broad-beam delivery, fine range adjustment is achieved by insertion of range shifting and compensating materials. In dosimetry, solid phantoms are often used for convenience. These materials should ideally be equivalent to water. In this study, the authors evaluated dosimetric water equivalence of four common plastics, high-density polyethylene (HDPE), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and polyoxymethylene (POM). Methods: Using the Bethe formula for energy loss, the Gottschalk formula for multiple scattering, and the Sihver formula for nuclear interactions, the authors calculated the effective densities ofmore » the plastics for these interactions. The authors experimentally measured variation of the Bragg peak of carbon-ion beams by insertion of HDPE, PMMA, and POM, which were compared with analytical model calculations. Results: The theoretical calculation resulted in slightly reduced multiple scattering and severely increased nuclear interactions for HDPE, compared to water and the other plastics. The increase in attenuation of carbon ions for 20-cm range shift was experimentally measured to be 8.9% for HDPE, 2.5% for PMMA, and 0.0% for POM while PET was theoretically estimated to be in between PMMA and POM. The agreement between the measurements and the calculations was about 1% or better. Conclusions: For carbon-ion beams, POM was dosimetrically indistinguishable from water and the best of the plastics examined in this study. The poorest was HDPE, which would reduce the Bragg peak by 0.45% per cm range shift, although with marginal superiority for reduced multiple scattering. Between the two clear plastics, PET would be superior to PMMA in dosimetric water equivalence.« less
  • The N-oxide of triethylenediamine is a globular molecule possessing a high electrical moment (4.64 D). The molecule presents a plastic crystalline phase (P2{sub 1}3) from 145 to 220{degree}C and a noncentrosymmetric crystalline phase (R3c) below this temperature range. Solid-state proton NMR allows us to characterize a molecular rotation around the ternary axis in the crystalline phase. Dielectric measurements in the plastic crystalline phase reveal a dipole reorientation along the <111> directions of the lattice. The use of such molecules for making materials for nonlinear optics is outlined.