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    Characterization of the microstructure in Mg based alloy

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    Thesis Arwa Kutbee
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    Type
    Thesis
    Authors
    Kutbee, Arwa T. cc
    Advisors
    Al-Kassab, Talaat
    Committee members
    Rothenberger, Alexander
    Schwingenschlögl, Udo cc
    Program
    Material Science and Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2013-06
    Permanent link to this record
    http://hdl.handle.net/10754/293688
    
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    Abstract
    The cast products Mg–Sn based alloys are promising candidates for automobile industries, since they provide a cheap yet thermally stable alternative to existing alloys. One drawback of the Mg–Sn based alloys is their insufficient hardness. The hardenability can be improved by engineering the microstructure through additions of Zn to the base alloy and selective aging conditions. Therefore, detailed knowledge about the microstructural characteristics and the role of Zn to promote precipitation hardening is essential for age hardenable Mg-based alloys. In this work, microstructural investigation of the Mg–1.4Sn–1.3Zn–0.1Mn (at.%) precipitation system was performed using TEM. The chemical composition of the precipitates was analyzed using EDS. APT was employed to obtain precise chemical information on the distribution of Zn in the microstructure. It was found from microstructural studies that different precipitates with varying sizes and phases were present; lath-shaped precipitates of the Mg2Sn phase have an incoherent interface with the matrix, unlike the lath-shaped MgZn2 precipitates. Furthermore, nano-sized precipitates dispersed in the microstructure with short-lath morphology can either be enriched with Sn or Zn. On the other hand, APT analysis revealed the strong repulsion between Sn and Zn atoms in a portion of the analysis volume. However, larger reconstruction volume required to identify the role of Zn is still limited to the optimization of specimen preparation.
    Citation
    Kutbee, A. T. (2013). Characterization of the microstructure in Mg based alloy. KAUST Research Repository. https://doi.org/10.25781/KAUST-3PI0G
    DOI
    10.25781/KAUST-3PI0G
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-3PI0G
    Scopus Count
    Collections
    MS Theses; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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