Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
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Volume 87, Issue 8
Displaying 1-2 of 2 articles from this issue
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Regular Article
  • HRTEM Characterization of an Age-Hardened Mg-Ca Binary Alloy
    Mariko Unekawa, Yoshihiro Terada
    Article type: Regular Article
    2023 Volume 87 Issue 8 Pages 231-234
    Published: August 01, 2023
    Released on J-STAGE: July 25, 2023
    Advance online publication: May 12, 2023
    DOIhttps://doi.org/10.2320/jinstmet.J2023002
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    A Mg-2.8 mass％ Ca binary alloy was subjected to a homogenization treatment. The three-dimensional morphology and coherency of the Mg2Ca phase (with C14 structure), which precipitated in the primary α-Mg dendrite, were investigated for the specimens aged at 423 K. The Mg2Ca precipitate exhibited a hexagonal plate-like morphology, with a planar surface that is parallel to the (0001)α basal plane and sides that are parallel to the {1010}α columnar plane of the α-Mg matrix. The coarsening Mg2Ca precipitate retained coherency with the α-Mg matrix for aging time of 3 h, which corresponded to the peak-aged condition. Furthermore, during the coarsening process, misfit dislocations were introduced on the planar surface of the precipitates, and the coherent interface became a semi-coherent interface for aging time of 100 h, which corresponded to the over-aged condition. The Mg2Ca precipitates evolved from a hexagonal plate-like morphology to a rectangular morphology and then to a polygonal morphology during aging treatment at 423 K.

     

    Mater. Trans. 64 (2023) 613-616に掲載

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  • Microstructural Analysis of Iron Phosphate Conversion Coatings by FE-SEM and XPS
    Yusuke Miyazawa, Keiichi Nakajima, Koki Itamoto, Sota Fukushima, Miku ...
    Article type: Regular Article
    2023 Volume 87 Issue 8 Pages 235-241
    Published: August 01, 2023
    Released on J-STAGE: July 25, 2023
    DOIhttps://doi.org/10.2320/jinstmet.J2023005
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    The microstructure and chemical composition of iron phosphate conversion coatings were investigated by surface/cross-sectional observation using FE-SEM/STEM and chemical state analysis using XPS. As a result, it was suggested that the conversion reaction progressed while the surface oxide on the base material remained, and the fine particles of coatings components were deposited and agglomerated to cover the material surface. The upper layer of coatings was mainly composed of iron phosphate, while the interface between the coatings and base material was deposited iron oxide. The proportion of iron phosphate and iron oxide was almost equal at the initial stage, and the amount of iron phosphate increased as the coating thickness.

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