The Microstructures of As-Cast Mg-Zr and Mg-Mn Alloys

Jian Ping Li; Gordon W. Lorimer; Joseph D. Robson; B. Davis

doi:10.4028/www.scientific.net/MSF.488-489.329

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Variations of Solute Concentration in the Crucible during Hot Chamber Die-Casting Process
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The Latest Technology Trends on Thixomolding® of Magnesium Alloys
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The Microstructures of As-Cast Mg-Zr and Mg-Mn Alloys
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A Rheological Model of Semisolid Magnesium Alloy Slurries
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Characterization of Magnesium Plates Produced by Wheel-Band Casting and Horizontal Continuous Casting
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Research on the Homogenization of ZK60 Magnesium Alloy Ingot
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Investigation on Low-Frequency Electromagnetic DC Casting of AZ91 Magnesium Alloy
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HomeMaterials Science ForumMaterials Science Forum Vols. 488-489The Microstructures of As-Cast Mg-Zr and Mg-Mn...

The Microstructures of As-Cast Mg-Zr and Mg-Mn Alloys

Abstract:

The as-cast microstructures of two dilute Mg-Zr and three dilute Mg-Mn alloys were studied using optical microscopy and scanning electron microscopy, including EDX analysis. The results show that the as-cast microstructure of the Mg-Zr alloys was composed of non-dendritic, equiaxed Mg grains, with a few Zr particles within the Mg grains and along grain boundaries. The grain size of the Mg-Zr alloy was significantly reduced by the Zr addition and a fine grain structure was achieved when the zirconium concentration was above 0.4wt. %. The as-cast structure of the Mg- Mn alloys contained columnar, dendritic grains. Two types of Mn particles (equiaxed large particles and rod-like or plate-like small particles) were observed in the as-cast Mg-Mn alloys. The volume fraction of particles and the size differences between the large and small particles increased with an increase of Mn concentration.