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Title: The thermodynamic form of peridynamics with application to phase transformations.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the 24th International Congress of Theoretical and Applied Mechanics held August 21-26, 2016 in Montreal, Quebec, Canada.
Country of Publication:
United States

Citation Formats

Silling, Stewart A. The thermodynamic form of peridynamics with application to phase transformations.. United States: N. p., 2016. Web.
Silling, Stewart A. The thermodynamic form of peridynamics with application to phase transformations.. United States.
Silling, Stewart A. 2016. "The thermodynamic form of peridynamics with application to phase transformations.". United States. doi:.
title = {The thermodynamic form of peridynamics with application to phase transformations.},
author = {Silling, Stewart A.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8

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  • EMF measurements of oxygen fugacities as a function of stoichiometry in YBa/sub 2/Cu/sub 3/O/sub x/ were made in the temperature range 650-750/degree/C by means of an oxygen titration technique with a ZrO/sub 2/ electrolyte doped with Y/sub 2/O/sub 3/. From plots of equilibrium oxygen pressures versus x, no sign of a change in curvature or discontinuity was observed at an oxygen stoichiometry of x = 6.5 where copper is divalent. A change in slope was observed when x /approximately/6.3. The EMF measurements were extended to an oxygen stoichiometry of x = 6.15; after slow cooling to room temperature, x-ray examinationmore » of the samples indicated that the original orthorhombic phase was completely transformed to tetragonal. A rapid increase in the partial molar entropy of oxygen, S//sub O/sub 2//, was found in the composition range x = 6.3 to 6.15. The increase in S//sub O/sub 2// values appears to reflect the differences between distributions of oxygen atoms and vacancies in the relatively disordered tetragonal structure and the more ordered orthorhombic structure. The results to date indicate that the important orthorhombic structure can exist over an extended oxygen composition range, namely, /approximately/6.3-7.0 at temperatures in the range of 650-750/degree/C. 10 refs., 5 figs., 1 tab.« less
  • It has been a challenge to measure in-situ phase transformation kinetics in structural alloys under rapid thermal cycles with good time resolution in the past. However, by using high-brightness synchrotron sources that deliver sufficient photon fluxes, in-situ time-resolved X-ray diffraction measurements with millisecond time-resolution are now possible. This technique was used to track nonequilibrium austenite formation in a Fe-C-Al-Mn steel weld during solidification. This solidification mode is contrary to the equilibrium ferrite solidification mode. Subsequent to solidification, splitting of austenite diffraction peaks with two different lattice parameters was observed during cooling. Continued cooling led to the decomposition of low-volume austenitemore » into bainite first which was followed by the decomposition of large-volume austenite to martensite. A similar phenomenon of austenite splitting and subsequent transformation of low-volume austenite first was also observed in a high-carbon steel before bainitic transformation.« less
  • Abstract not provided.