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Title: Positron annihilation study of vacancy-type defects in Al single crystal foils with the tweed structures across the surface

The vacancy-type defects in the aluminum single crystal foils after a series of the cyclic tensions were studied using positron annihilation. Two components were identified in the positron lifetime spectra associated with the annihilation of free positrons and positrons trapped by dislocations. With increasing number of cycles the dislocation density firstly increases and reaches a maximum value at N = 10 000 cycles but then it gradually decreases and at N = 70 000 cycles falls down to the level typical for the virgin samples. The direct evidence on the formation of a two-phase system “defective near-surface layer/base Al crystal” in aluminum foils at cyclic tension was obtained using a positron beam with the variable energy.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4] ; ; ;  [1] ;  [5]
  1. National Research Tomsk Polytechnic University, Tomsk, 634050 (Russian Federation)
  2. (Russian Federation)
  3. Charles University in Prague, Praha, CZ-18000 Czech Republic (Czech Republic)
  4. Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, D-01314 Germany (Germany)
  5. Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation)
Publication Date:
OSTI Identifier:
22492555
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1683; Journal Issue: 1; Conference: International conference on advanced materials with hierarchical structure for new technologies and reliable structures 2015, Tomsk (Russian Federation), 21-25 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; ALUMINIUM; ANNIHILATION; DEFECTS; DENSITY; DISLOCATIONS; FOILS; LAYERS; MONOCRYSTALS; POSITRON BEAMS; POSITRONS; SPECTRA; SURFACES; VACANCIES