Abstract
The influence of samarium (Sm) content on the solidification characteristics, microstructure, and mechanical properties of Mg–2.8wt%Nd–1.5wt%Gd–0.5wt%Zn–0.5wt%Zr magnesium alloy was studied. The cooling curves and microstructure analysis results showed that Sm rare earth element refined the grains of the alloys, where the solidification time of α-Mg phase of decreased as addition of Sm, which reflected to the microstructure of alloy and the grains became refined, also Sm combined with the initial phase of the intermetallic base alloy and crystallized along the grain boundaries. In addition, Mg41Sm5, Mg3Zn6Sm and (Mg, Zn)3Sm new intermetallic phases were formed as addition of Sm. Both grain refinement and formed intermetallic phases led to the improvement in hardness and tensile strength.
Highlights
Reduced weight of products can be attained by many approaches such as redesign, removal of unnecessary parts, reducing thickness and selection of light materials
The solidification temperature started in Mg-10Gd-3Y-0.4Zr alloy at 640.2°C (Song, Wu et al 2015), and α-Mg phases of the as-cast Mg–4Sm–4Zn–0.5Zr alloy formed at 642 °C (Che, Cai et al 2017)
The primary stable dendrites start to solidify from the melt at nucleation temperature (TNα-Mg), which decreased to 641.3 °C as 1.5 wt. % of Sm added due to forming of third phase which detected via XRD
Summary
Reduced weight of products can be attained by many approaches such as redesign, removal of unnecessary parts, reducing thickness and selection of light materials. For such reasons, much effort has been spent on developing lighter materials, such as composites, and Al and Mg alloys for vehicles, and aerospace industrials (Ferro, Saccone et al 2013). Recent studies highlighted that some rare earth (RE) metals, such as Yttrium (Y), Neodymium (Nd) and Samarium (Sm) are very effective elements to improve the mechanical properties of Mg alloys. Mechanical properties of magnesium can be enhanced by adding different contents of element-alloy which results improvements in increased tensile strength, creep resistance, thermal stability, or corrosion resistance. The solidification behavior, microstructure, and mechanical properties of Mg-Nd-Gd-Zn-Zr magnesium alloy with samarium additions are investigated
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