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Precipitation of binary quasicrystals along dislocations

Journal Article · · Nature Communications
 [1];  [2];  [3];  [2];  [2];  [4]
  1. Univ. of Science and Technology of China, Shenyang (China). School of Materials Science and Engineering. Chinese Academy of Sciences (CAS). Inst. of Metal Research. Shenyang National Lab. for Materials Science; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; DOE/OSTI
  2. Univ. of Science and Technology of China, Shenyang (China). School of Materials Science and Engineering. Chinese Academy of Sciences (CAS). Inst. of Metal Research. Shenyang National Lab. for Materials Science
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  4. National Univ. of Singapore (Singapore). Dept. of Materials Science and Engineering
Dislocations in crystals naturally break the symmetry of the bulk, introducing local atomic configurations with symmetries such as fivefold rings. But dislocations do not usually nucleate aperiodic structure along their length. Here we demonstrate the formation of extended binary quasicrystalline precipitates with Penrose-like random-tiling structures, beginning with chemical ordering within the pentagonal structure at cores of prismatic dislocations in Mg–Zn alloys. Atomic resolution observations indicate that icosahedral chains centered along [0001] pillars of Zn interstitial atoms are formed templated by the fivefold rings at dislocation cores. They subsequently form columns of rhombic and elongated hexagonal tiles parallel to the dislocation lines. Quasicrystalline precipitates are formed by random tiling of these rhombic and hexagonal tiles. Such precipitation may impact dislocation glide and alloy strength.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1624078
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)


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