Influence of structural heterogeneity on the structural coarsening during annealing of polycrystalline Ni subjected to dynamic plastic deformation

H.W. Zhang, Z.P. Luo, Niels Hansen, K. Lu

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    Abstract

    The structural heterogeneity of a polycrystalline Ni subjected to dynamic plastic deformation to a strain of 2.3 was characterized, and its influence on the structural coarsening behaviour during post annealing was investigated. Structural heterogeneity on the large scale manifests itself by formation of two types of layers: low misoriented regions (LMRs) and highly misoriented regions (HMRs). On the small scale, the heterogeneity was characterized by different distributions of boundaries and textures in each layer. LMRs contain only low angle boundaries and one dominating crystallographic orientation. In contrast HMRs contain both low and high angle boundaries (>15o) and the texture is mixed with <011> close to the compression axis. During annealing, LMRs coarsen uniformly and recrystallization nucleation is difficult to form. In HMRs, the structural evolution is heterogeneous and recrystallization nuclei are readily formed. The importance of structural heterogeneity during structural design for high performance nanostructure was highlighted.
    Original languageEnglish
    Article number012056
    JournalI O P Conference Series: Materials Science and Engineering
    Volume89
    Number of pages8
    ISSN1757-8981
    DOIs
    Publication statusPublished - 2015
    Event36th Risø International Symposium on Materials Science - DTU Risø Campus, Roskilde, Denmark
    Duration: 7 Sept 201511 Sept 2015
    Conference number: 36

    Conference

    Conference36th Risø International Symposium on Materials Science
    Number36
    LocationDTU Risø Campus
    Country/TerritoryDenmark
    CityRoskilde
    Period07/09/201511/09/2015

    Bibliographical note

    Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd

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