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    National Tsing Hua University Institutional Repository > 原子科學院  > 工程與系統科學系 > 期刊論文 >  Interface structure of BCC/18R martensite in Fe-Al-Mn-C alloy

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/47704

    Title: Interface structure of BCC/18R martensite in Fe-Al-Mn-C alloy
    Authors: Lee,W. B.;Chen,F. -R;Wan,C. M.
    教師: 陳福榮
    Date: 1995
    Publisher: Trans Tech Publications
    Relation: INTERFACES II, Trans Tech Publications, Volume 189-, 1995, Pages 241-247
    Keywords: Martensite
    Interfaces (materials)
    Iron alloys
    Dislocations (crystals)
    Transmission electron microscopy
    Crystal structure
    Imaging techniques
    Crystal lattices
    Lattice constants
    Computer simulation
    Abstract: 18R martensite phase was observed in the bcc matrix in a Fe-25.8wt%Mn-7.4wt%Al-0.11wt%C alloy, after cooling from high temperature. The crystal structure of 18R martensite is determined from the SAD and high resolution imaging techniques. The 18R martensite has an orthorhombic lattice with the lattice constant a = 0.448 nm, b = 0.259 nm, and c = 3.865 nm and can be described as a 18R(42 over-bar )3 rather than a 18R(51 over-bar )3 structure. The martensitic crystallography such as orientation relationship, habit plane, shape strain direction and magnitude of lattice invariant shear can be calculated using CRAB phenomenological martensitic theory. The calculated crystallography fits very well with the experimental crystallography. The Burgers vector of anticoherency dislocation and shape strain direction were confirmed by using two beam technique and computer image simulation. Martensitic crystallography analyses suggest that the bcc/18R(42 over-bar )3 interface may be more energetically favorable than the bcc/18R(51 over-bar )3 interface.
    URI: http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=TRD&recid=0191095SO&q=Interface+structure+of+BCC%2F18R+martensite+in+Fe-Al-Mn-C+alloy&uid=791628199&setcookie=yes
    Appears in Collections:[工程與系統科學系] 期刊論文

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