Nucleation of the Primary Al Phase on TiAl_3 during Solidification in Hot-Dip Zn-11%Al-3%Mg-0.2%Si-Coated Steel Sheet

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The solidification structure of a hot-dip Zn-11%Al-3%Mg-0.2%Si coated steel sheet with a slight Ti addition was investigated by EBSD. In every center of the primary Al phase of the alloy-coating layer, TiAl<SUB>3</SUB> was observed by a scanning electron microscope, which suggests that TiAl<SUB>3</SUB> acts as a heterogeneous nucleation site of the primary Al phase. The latter was revealed to have perfect lattice coherency with the nucleus TiAl<SUB>3</SUB> phase. The crystal orientation relationships between TiAl<SUB>3</SUB> and the primary Al are (001)<SUB>TiAl<SUB>3</SUB></SUB>||(001)<SUB>Al</SUB> and [100]<SUB>TiAl<SUB>3</SUB></SUB>||[100]<SUB>Al</SUB>, (100)<SUB>TiAl<SUB>3</SUB></SUB>||(001)<SUB>Al</SUB> and [001]<SUB>TiAl<SUB>3</SUB></SUB>||[100]<SUB>Al</SUB>, (102)<SUB>TiAl<SUB>3</SUB></SUB>||(110)<SUB>Al</SUB> and [\\bar201]<SUB>TiAl<SUB>3</SUB></SUB>||[\\bar110]<SUB>Al</SUB>, (110)<SUB>TiAl<SUB>3</SUB></SUB>||(110)<SUB>Al</SUB> and [\\bar110]<SUB>TiAl<SUB>3</SUB></SUB>||[\\bar110]<SUB>Al</SUB>, indicating that the primary Al phase grows in an epitaxial manner from the nucleus TiAl<SUB>3</SUB> phase. The planar disregistry δ between the two phases was calculated to be less than 5%, owing to this good lattice coherency. The TiAl<SUB>3</SUB> phase is considered to decrease the degree of undercooling necessary for the nucleation of the primary Al phase.

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  • Materials transactions  

    Materials transactions 49(6), 1401-1409, 2008-06-01 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10021147710
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    9519470
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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