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Hanxue Cao,Hao Jiang,Yanyan Huang,Chengzhi Yang,Siyuan Long 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.11
Two purification approaches, flux approach (flux shielding and flux refining) and fluxless approach (protective atmospheres and inert gas bubbling), are implemented to remove the inclusions in Mg-Nd-Zn-Zr melt. The purification effects are assessed by studying structural properties, chemical composition and the origin of the inclusions. The amount and the average size of the inclusions raise at first, then decrease during flux (or fluxless) refining process, which include 15 min flux refining (or gas bubbling) and 10 min settling. Both approaches have the effect to protect Mg melt and separate inclusions from the melt, but fluxless approach is not as effective as flux approach in the control of inclusions. Either way, oxides and carbides can be found in magnesium (Mg) melt, and the former are the most predominant non-metallic inclusions. Undissolved zirconium (Zr) particles are observed over the process of both techniques, which is a characteristic of Zr alloying Mg alloys, and these particles are easy to settle due to high density. The emergence of chlorine (Cl) atoms in inclusions implies flux inclusions are formed during flux purification, while sulphur (S) is detected in fluxless purification indicates sulphides or sulphates occur in Mg melt as a result of the usage of fire extinguishing sulfur powder.
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