The Activation of Magnesium Sintering by Zinc Addition

Author:

Teslia Serhii1ORCID,Kovalenko Mykyta1ORCID,Teslia Mariia1,Vterkovskiy Mykhailo1,Solodkyi Ievgen12,Loboda Petro1,Soloviova Tetiana1

Affiliation:

1. Department of High Temperature Materials and Powder Metallurgy, National Technical University ‘Igor Sikorsky Kyiv Polytechnic Institute’, Beresteiskyi. Ave. 37, 03056 Kyiv, Ukraine

2. Institute of Materials and Joining Technology, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

Abstract

Light alloys based on magnesium are widely used in most areas of science and technology. However, magnesium powder alloys are quite difficult to sinter due to the stable film of oxides that counteracts diffusion. Therefore, finding a method to activate magnesium sintering is urgent. This study examines the effect of adding 5 wt. % and 10 wt. % zinc to the sintering pattern of magnesium powders at 430 °C; a dwell of 30 min was used to homogenize at the densification’s temperature. Scanning electron microscopy (SEM) was used to characterize the alloy’s microstructure, while the phase composition was characterized using X-ray diffraction (XRD) and energy dispersion spectroscopy (EDS). The sintering densities of Mg–5Zn and Mg–10Zn were found to be 88% and 92%, respectively. The results show that after sintering, a heterophase structure of the alloy is formed based on a solid solution and phases MgZn and Mg50Zn21. To establish the sintering mechanism, the interaction at the MgO and Zn melt phase interface was analyzed using the sessile drop method. The minimum contact angle—65°—was discovered at 500 °C with a 20 min holding time. It was demonstrated that the sintering process in the Mg–Zn system proceeds through the following stages: (1) penetration of zinc into oxide-free surfaces; (2) crystallization of a solid solution, intermetallics; and (3) the removal of magnesium oxide from the particle surface, with oxide particles deposited on the surface of the sample.

Funder

Ministry of Education and Science of Ukraine

Author Voucher

Publisher

MDPI AG

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