Characterization of Squeeze Cast Mg Alloy AM50 Containing Ca Addition

Abstract:

Metallographic analyses on microstructure of squeeze cast magnesium alloy AM50 with different levels of calcium addition are performed via optical microscopy (OM), and scanning electron microscopy (SEM). The OM results show the calcium has a grain refining effect on the base alloy AM50 with the level of Ca addition up to 2 wt.%. As the Ca content further increases, its grain refining effect becomes limited. The SEM observation reveals the addition of 2 wt.% Ca to the AM50 alloy leads to the formation of a continuous network of eutectic phases along grain boundaries while the discontinuous divorced secondary eutectic β-Mg₁₂Al₁₇ is present in the microstructure of AM50 containing also the primary α-Mg, and Mn-Al intermetallic particles. The elemental mapping by the energy dispersive spectroscopy (EDS) indicates the presence of the major alloying elements of Al and Ca along grain boundaries in the squeeze cast AM50 alloy with Ca addition.

• Periodical: Applied Mechanics and Materials (Volume 872)
• Pages: 14-18
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.872.14
• Online since: October 2017
• Authors: Lu Yang Ren, Mohsen Masoumi, Henry Hu*
• Keywords: Ca Addition, Mg Alloy AM50, Microstructure, SEM Analysis, Squeeze Casting, TEM Analysis

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