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

Title: Avalanches, plasticity, and ordering in colloidal crystals under compression

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)
OSTI Identifier:
1256994
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 93; Journal Issue: 6; Related Information: CHORUS Timestamp: 2016-12-23 20:31:32; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

McDermott, D., Reichhardt, C. J. Olson, and Reichhardt, C. Avalanches, plasticity, and ordering in colloidal crystals under compression. United States: N. p., 2016. Web. doi:10.1103/PhysRevE.93.062607.
McDermott, D., Reichhardt, C. J. Olson, & Reichhardt, C. Avalanches, plasticity, and ordering in colloidal crystals under compression. United States. doi:10.1103/PhysRevE.93.062607.
McDermott, D., Reichhardt, C. J. Olson, and Reichhardt, C. 2016. "Avalanches, plasticity, and ordering in colloidal crystals under compression". United States. doi:10.1103/PhysRevE.93.062607.
@article{osti_1256994,
title = {Avalanches, plasticity, and ordering in colloidal crystals under compression},
author = {McDermott, D. and Reichhardt, C. J. Olson and Reichhardt, C.},
abstractNote = {},
doi = {10.1103/PhysRevE.93.062607},
journal = {Physical Review E},
number = 6,
volume = 93,
place = {United States},
year = 2016,
month = 6
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevE.93.062607

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

Save / Share:
  • Compressive axial loadings are performed on differently oriented aluminium and copper single crystals between room temperature and 0.9 times the melting temperature. In this first part of the work, attention is paid to the influence on the hardening evolution of the type of active strain mechanisms and the associated lattice rotations. The lattice rotation amplitudes for unstable orientations decrease when the temperature increases and almost vanish above 0.7 T{sub m}. Octahedral straight slip traces evolve into weavy and distant ones, and occurrence of non-octahedral slip is observed. The stress-strain curves are resolved on the dominant octahedral slip system. The comparisonmore » for different orientations of this reference hardening modulus allows to separate lattice rotation effects and true hardening stages. This representation allows to estimate to what extent hardening characteristics can be considered as orientation independent. Part II, devoted to quantitative analyses on these hardening parameters, will follow.« less
  • A hydrothermally grown synthetic quartz crystal with 370 +- 60 ppm hydroxyl impurity was cut into right rectangular prisms in eight crystallographic orientations. We compressed the prisms under constant axial force corresponding to a uniaxial stress of 140.0 +- 0.5 MPa, and temperatures of 510/sup 0/ and 750/sup 0/C. All but one of the samples sustained permanent axial strains of 2--3%. We established the operating slip systems from specimen shape change, slip bands and dislocation etch pits on polished surfaces, crystallographic orientation changes, stress optical features in thin sections, and transmission electron microscopy. The observed creep behavior and plasticity dividedmore » the samples into three groups: (1) Crystals compressed at 45/sup 0/ to (0001) and (2110) and those compressed perpendicular(0111) and perpendicular(0111) deformed principally by slip parallel to (0001). Creep rates were relatively high and were not strongly sensitive to test temperature. Dislocation arrays approximately parallel to (2110) are common. Dislocation loops are elongate parallel to (0001), indicating that the edge segments were more mobile than the screw segements. (2) The second groups of samples were loaded normal to (0001) in three orientation: perpendicular(2110), perpendicular(0110), and at 45/sup 0/ to (1100). These samples deformed primarily by 0 )1010) slip with some evidence for secondary slip on the other systems. They were more creep resistant than the first group and displayed a much higher sensitivity of creep rate to test temperature.« less
  • When plasticity data from weak shocks are plotted in the form of plastic strain rate versus deviatoric stress, the resulting curve exhibits a loop for several metals. Using the single-state- variable theory of E. W. Hart (Acta Metall. {bold 18}, 599 (1970)), this loop is interpreted to mean more than one state variable is necessary to explain the shock-wave plasticity for these metals. This circumstance could be due to a change in the mechanism of plastic flow to dislocation drag. Other explanations are possible, however.
  • Experimental copper and stainless-steel particle velocity profiles are analyzed to determine the plastic strain, plastic strain rate, and deviatoric stress through the shock front. A steady-wave shock analysis is used, together with a numerical characteristics-code calculation to correct for reflections created when the steady wave passes through the sample-window interface. The results are well represented by power-law relations giving the plastic strain rate as powers of the deviatoric stress and plastic strain. The effects of the sample-window interface are found to be minor for windows closely matched in impedance to the sample. The effects of the window on the strain-ratemore » relation are appreciable only near peak compression.« less