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Title: Case Studies of the Temperature Dependence of Grain Boundary Mobility.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Under Secretary for Science (S-4)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the TMS 2015 held March 16-19, 2015 in Orlando, FL.
Country of Publication:
United States

Citation Formats

O'Brien, Christopher John, and Foiles, Stephen M. Case Studies of the Temperature Dependence of Grain Boundary Mobility.. United States: N. p., 2015. Web.
O'Brien, Christopher John, & Foiles, Stephen M. Case Studies of the Temperature Dependence of Grain Boundary Mobility.. United States.
O'Brien, Christopher John, and Foiles, Stephen M. 2015. "Case Studies of the Temperature Dependence of Grain Boundary Mobility.". United States. doi:.
title = {Case Studies of the Temperature Dependence of Grain Boundary Mobility.},
author = {O'Brien, Christopher John and Foiles, Stephen M.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 3

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  • High temperature fully reversed fatigue tests of high purity copper were made as a function of stress amplitude. A mean cavity volume V{sub p} and corresponding number density of cavities N{sub p} were determined from the total cavity volume fraction V{sub v} obtained from precision density measurements (PDM) and the total cavity surface area S{sub v} calculated from small angle neutron scattering (SANS) measurements. Under the range of stress amplitudes tested, the plastic strain rate d{epsilon}{sub p}/dt was found to cover three orders of magnitude. The results of these tests of the influence of stress amplitude on cavity growth weremore » combined with previous results in which the frequency of cycling was varied. It was found that the cavity growth rate correlates well with the measured plastic strain and stress amplitude through the relation dV{sub p}/dt {proportional{underscore}to} (d{epsilon}{sub p}/dt){sup 0.45} {proportional{underscore}to} {Delta}{sigma}{sup 2}.« less
  • Grain Orientation and gain boundary misorientation distributions in high critical current density, high temperature superconductors were determined using electron backscatter Kikuchi diffraction. It is found that depending on the type of superconductor and the processing method used to fabricate it, there exist different scales of biaxial texture from no biaxial texture, local biaxial texture, to complete biaxial texture. Experimentally obtained grain boundary misorientation distributions (GBMDs) were found to be skewed significantly to low angles in comparison to what is expected on the basis of macroscopic texture alone, suggesting that minimization of energy may be a driving force during the processingmore » of high critical current density materials. In addition, a higher than expected fraction of coincident-site lattice boundaries is observed. Examination of maps of grain boundary misorientations in spatially correlated gains, i.e. the grain boundary mesotexture, suggests the presence percolative paths of high critical current density. A combination of orientation measurements, theoretical modeling of GBMDs and modeling of percolative current flow through an assemblage of gain boundaries is performed to gain an insight into the important microstructural features dictating the transport properties of high temperature superconductors. It is found that maximization of low energy, in particular, low angle boundaries is essential for higher critical currents. The combination of experimental and analytical techniques employed are applicable to other materials where physical properties are dominated by interganular characteristics.« less