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Faculty of Mechanical Engineering, Lj. (FSLJ)
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  • Characterization of the bonding zone in AZ91/AlSi12 bimetals fabricated by liquid-solid compound casting using unmodified and thermally modified AlSi12 alloy
    Mola, Renata ; Bucki, Tomasz
    Liquid-solid compound casting was used to produce two types of AZ91/AlSi12 joints. The magnesium alloy was the cast material poured onto a solid aluminium alloy insert with an unmodified or modified ... structure. The bonding zone obtained for the unmodified insert was not uniform in thickness. There was a eutectic region (Mg17Al12 + a solid solution of Al in Mg) in the area closest to the AZ91. The region adjacent to the AlSi12 had a non-uniform structure with partly reacted Si particles surrounded by the Mg2Si phase and agglomerates of Mg2Si particles unevenly distributed in the Mg-Al intermetallic phases matrix. Cracks were detected in this region. In the AZ91/AlSi12 joint produced with a thermally modified AlSi12 insert, the bonding zone was uniform in thickness. The region closest to the AZ91 alloy also had a eutectic structure. However, significant microstructural changes were reported in the region adjacent to the modified AlSi12 alloy. The microstructure of the region was uniform with no cracks; the fine Mg2Si particles were evenly distributed over the Mg-Al intermetallic phase matrix. The study revealed that in both cases the microhardness of the bonding zone was several times higher than those of the individual alloys; however, during indenter loading, the bonding zone fabricated from modified AlSi12 alloy was less prone to cracking.
    Source: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Vol. 66, no. 7/8, Jul.-Aug. 2020, str. 439-448)
    Type of material - article, component part
    Publish date - 2020
    Language - english
    COBISS.SI-ID - 27955459

    Link(s):

    https://www.sv-jme.eu/sl/article/characterization-of-the-bonding-zone-in-az91alsi12-bimetals-fabricated-by-liquid-solid-compound-casting-using-unmodified-and-modified-alsi12-alloy/
    Digitalna knjižnica Slovenije - dLib.si
    DOI

source: Strojniški vestnik = Journal of mechanical engineering. - ISSN 0039-2480 (Vol. 66, no. 7/8, Jul.-Aug. 2020, str. 439-448)

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