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      Microstructure of die-cast alloys Mg–Zn–Al(–Ca): a study by electron microscopy and small-angle neutron scattering

      1 , 2 , 3 , 3 , 4 , 1
      International Journal of Materials Research
      Walter de Gruyter GmbH

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          Abstract

          The microstructure of a magnesium die-cast alloy with 8 wt.% Zn and 5 wt.% Al (ZA85) and of two alloy modifications with 0.3 and 0.9 wt.% Ca (ZACa8503 and ZACa8509) are compared. Optical, scanning electron and transmission electron microscopy (TEM) were used to study the microstructure in as-cast and annealed conditions. Small-angle neutron scattering (SANS) measurements were carried out to characterize the early stages of the precipitation process. The die-cast microstructure of ZA85, ZACa8503 and ZACa8509 consists of dendritic α-Mg grains and coarse intermetallic grain-boundary phases. In the Ca-free ZA85 alloy, grain boundaries are decorated with a quasi-crystalline phase with icosahedral point-group symmetry (I phase), a metastable modification of the equilibrium τ phase (Mg 32(Al, Zn) 49). At the grain boundaries of the Ca-containing ZA85 alloys, small amounts of the stable cubic τ phase Mg 32(Al, Zn, Ca) 49 as well as Al 2(Ca, Zn) phase, were detected in addition to the I phase. In the as-cast condition, regions supersaturated with Al and Zn were found to surround the α-Mg grains and to become τ phase precipitation sites during high-temperature annealing in all alloys investigated. TEM and SANS measurements revealed no influence of Ca on the size distribution and the coarsening rate of the precipitates, which are formed by a continuous precipitation process.

          Most cited references14

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          Magnesium

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            Metallic Phase with Long-Range Orientational Order and No Translational Symmetry

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              Magnesium alloys and applications

              I. Polmear (2013)
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                Author and article information

                Journal
                International Journal of Materials Research
                Walter de Gruyter GmbH
                2195-8556
                1862-5282
                February 05 2022
                February 05 2022
                May 01 2003
                February 05 2022
                February 05 2022
                May 01 2003
                : 94
                : 5
                : 564-571
                Affiliations
                [1 ]Max-Planck-Institut für Metallforschung and Institut für Metallkunde, University of Stuttgart, Stuttgart Germany
                [2 ]Now at Institut für Materialforschung II, Forschungszentrum Karlsruhe, and Institut für Zuverlässigkeit von Bauteilen und Systemen, University of Karlsruhe , Karlsruhe Germany
                [3 ]Institute for Materials Research, GKSS Forschungszentrum Geesthacht Germany
                [4 ]EADS Ottobrunn Germany
                Article
                10.1515/ijmr-2003-0099
                21b25098-6100-4183-8a45-59d500ce4cf8
                © 2003
                History

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