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Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals

Nature communications, 2020-05, Vol.11 (1), p.2483-2483, Article 2483 [Peer Reviewed Journal]

The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;The Author(s) 2020 ;ISSN: 2041-1723 ;EISSN: 2041-1723 ;DOI: 10.1038/s41467-020-16351-0 ;PMID: 32424342

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  • Title:
    Direct observation of dual-step twinning nucleation in hexagonal close-packed crystals
  • Author: He, Yang ; Li, Bin ; Wang, Chongmin ; Mao, Scott X
  • Subjects: Boundaries ; Crystal structure ; Crystals ; Deviation ; Dislocations ; Hexagonal close packed crystals ; High resolution ; Interfaces ; Magnesium ; MATERIALS SCIENCE ; Metals and alloys ; Nanocrystals ; Nucleation ; Rhenium ; structural properties ; Titanium ; Transmission electron microscopy ; Twin boundaries ; Twinning
  • Is Part Of: Nature communications, 2020-05, Vol.11 (1), p.2483-2483, Article 2483
  • Description: Design and processing of advanced lightweight structural alloys based on magnesium and titanium rely critically on a control over twinning that remains elusive to date and is dependent on an explicit understanding on the twinning nucleation mechanism in hexagonal close-packed (HCP) crystals. Here, by using in-situ high resolution transmission electron microscopy, we directly show a dual-step twinning nucleation mechanism in HCP rhenium nanocrystals. We find that nucleation of the predominant {1 0 -1 2} twinning is initiated by disconnections on the Prismatic│Basal interfaces which establish the lattice correspondence of the twin with a minor deviation from the ideal orientation. Subsequently, the minor deviation is corrected by the formation of coherent twin boundaries through rearrangement of the disconnections on the Prismatic│Basal interface; thereafter, the coherent twin boundaries propagate by twinning dislocations. The findings provide high-resolution direct evidence of the twinning nucleation mechanism in HCP crystals.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2041-1723
    EISSN: 2041-1723
    DOI: 10.1038/s41467-020-16351-0
    PMID: 32424342
  • Source: PubMed Central
    ProQuest Central
    DOAJ
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