Abstract
Mg‒Zn‒Ca metallic glasses are regarded as promising biodegradable materials. Previous studies on this alloy system have mostly focused on the composition regions with a large critical size (Dc) for the formation of metallic glasses, while this paper investigates the composition regions with a small Dc, which has been overlooked by researchers for a long time. The effects of the addition of Ag, Nd, and Yb elements on the microstructure and mechanical properties of Mg‒Zn‒Ca metallic glasses were studied. It was found that the Mg‒Zn‒Ca metallic glass exhibits a single and uniform amorphous structure with a compressive strength of 590 MPa. After the addition of a small amount of Ag into the alloy, the amorphous matrix is retained and new precipitate phases that lead to the decrease of the compressive strength are formed. The addition of the rare earth elements Nd and Yb changes the microstructure from a single amorphous matrix to a large number of quasicrystal phases, which results in an increase in compressive strength. The compressive strength of the Mg‒Zn‒Ca‒Yb alloy increases to 606.2 MPa due to the formation of multi-layered swirling solidified structure and a large number of small quasicrystals with high microhardness. Moreover, this study can be considered as a useful supplement to the existing studies on the Mg‒Zn‒Ca alloy system; it also provides new ideas for designing the microstructure and spatial structure of quasicrystal containing alloys with high performances.
Highlights
As an environmentally friendly material, magnesium alloys have the characteristics of light weight and high reserve content in the earth crust
The present paper focused on the composition regions in a Mg-Zn-Ca alloy system with a small Dc
The present paper focused on the composition regions in a Mg‒Zn‒Ca alloy system with a
Summary
As an environmentally friendly material, magnesium alloys have the characteristics of light weight and high reserve content in the earth crust. They have been widely used in electronic products and medical equipment [1,2]. Mg-Zn-Ca metallic glass is a typical Mg-based amorphous alloy. Some studies attempted to obtain Mg-Zn-Ca alloys with a large critical size (Dc ) for the formation of metallic glass. In this way, Metals 2018, 8, 856; doi:10.3390/met8100856 www.mdpi.com/journal/metals
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