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Search: WFRF:(Pan Yongxin)

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1.
  • Liu, Min, et al. (author)
  • Density-functional theory study of point defect formation and diffusion in alpha-alumina and effects of applied strain and alloy doping
  • 2023
  • In: Materials Today Communications. - : Elsevier BV. - 2352-4928. ; 34
  • Journal article (peer-reviewed)abstract
    • Oxidation of alumina-forming alloys and breakdown of a-Al2O3 are important processes for alloys used in hightemperature environments. By using density-functional theory simulations, we investigate the formation and diffusion of three common point defects. Influences of diffusion pathway, axial strain and alloy doping on defect energetics during its formation and diffusion are systematically investigated. Results indicate a positive correlation between the diffusion energy barrier and the pathway length. We highlighted that diffusion barrier of vacancy defects can be reduced to that of interstitial defects by applying tensile strain, indicating that the strain state can transform the diffusion mechanism within a-Al2O3 . Moreover, the alloying dopants (Cr, Mo, Cu, Si, Y, Zr) investigated here can be categorized as: inhibitive, promotive, and inert, depending on their roles in determining the diffusion barrier of oxygen vacancy, which is analyzed by the element-dependent substitution energies, atomic radius, electronegativity, volumetric change, and electronic transition.
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2.
  • Wang, Rongsheng, et al. (author)
  • Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection
  • 2012
  • In: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 117, s. A07223-
  • Journal article (peer-reviewed)abstract
    • A magnetic reconnection event with a moderate guide field encountered by Cluster in the near-Earth tail on 28 August 2002 is reported. The guide field points dawnward during this event. The quadrupolar structure of the Hall magnetic field within the ion diffusion region is distorted toward the northern hemisphere in the earthward part while toward the southern hemisphere tailward part of X-line. Observations of current density and electron pitch angle distribution indicate that the distorted quadrupolar structure is formed due to a deformed Hall electron current system. Cluster crossed the ion diffusion region from south to north earthward of the X-line. An electron density cavity is confirmed in the northern separatrix layer while a thin current layer (TCL) is measured in the southern separatrix layer. The TCL is formed due to electrons injected into the X-line along the magnetic field. These observations are different from simulation results where the cavity is produced associated with inflow electrons along the southern separatrix while the strong current sheet appears with the outflow electron beam along the northern separatrix. The energy of the inflowing electron in the separatrix layer could extend up to 10 keV. Energetic electron fluxes up to 50 keV have a clear peak in the TCL. The length of the separatrix layer is estimated to be at least 65 c/omega(pi). These observations suggest that electrons could be pre-accelerated before they are ejected into the X-line region along the separatrix. Multiple secondary flux ropes moving earthward are observed within the diffusion region. These secondary flux ropes are all identified earthward of the observed TCL. These observations further suggest there are numerous small scale structures within the ion diffusion region.
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