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Effect of Ca addition on the damping capacity of Mg-Al-Zn casting alloys

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Abstract

The influences of Ca addition on the microstructures and damping capacities of AZ91-(0∼2)%Ca casting alloys were investigated, on the basis of the results of X-ray diffractometry, optical microscopy, scanning electron microscopy and vibration tests in a single cantilever mode. The amount of intermetallic compounds decreased with increasing Ca content up to 0.5%, above which it increased; the average cell size showed the opposite tendency. All alloys exhibited similar damping levels in the strain-amplitude independent region. Considering the very low solubility of Ca in the matrix, and that most of the Ca elements are consumed by the formation of the Al2Ca phase and incorporation into the Mg17Al12 phase, this would be ascribed to the almost identical concentrations of Ca solutes distributed in the matrix. In the strain-amplitude dependent region, however, the AZ91-0.5%Ca alloy possessed the maximum damping capacity. From the viewpoint of microstructural evolution with Ca addition, the number density of compound particles is considered to be the principal factor affecting the damping behavior in the strain-amplitude dependent region.

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Authors and Affiliations

  1. Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, Incheon, 406-840, Korea

    Joong-Hwan Jun & Jung-Hyun Moon

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  1. Joong-Hwan Jun
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  2. Jung-Hyun Moon
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Correspondence to Joong-Hwan Jun.

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Jun, JH., Moon, JH. Effect of Ca addition on the damping capacity of Mg-Al-Zn casting alloys. Met. Mater. Int. 21, 780–783 (2015). https://doi.org/10.1007/s12540-015-4367-0

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  • DOI: https://doi.org/10.1007/s12540-015-4367-0

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