Abstract
In the present study, AZ41 and AZ51 alloys were fabricated using disintegrated melt deposition technique followed by hot extrusion. AZ41/Yttria and AZ51/Yttria composites were prepared using 0.6 wt% yttria nano particles in the alloys using the same fabrication technique. From the tensile test results, both strengths (yield and tensile) and ductility were improved in AZ51 when compared to AZ41. In comparison with its alloy counterparts, the yield and tensile strengths were enhanced while maintaining the same ductility in AZ41/Yttria composite, but comparable strengths with decreased ductility were observed in AZ51/Yttria composite. Under compressive loading, an improvement in strengths with similar ductility was observed in AZ51 when compared to AZ41. The best combination of strengths and ductility was observed in AZ51/Yttria composites from compression test results. The obtained mechanical properties are correlated with the microstructure observations.
Highlights
Magnesium is the lightest structural metal with a potential to replace aluminum as its density is about 35% lower than aluminum [1]
The results showed that the average grain size in AZ51 alloy is about half when compared to AZ41 alloy
In case of their composites counterparts containing Y2O3 reinforcement, grain size reduction was noticeable in AZ41 + Y2O3 composite when compared to AZ41, whereas the grains of AZ51 + Y2O3
Summary
Magnesium is the lightest structural metal with a potential to replace aluminum as its density is about 35% lower than aluminum [1]. To improve its strength-to-weight ratio, magnesium is alloyed with various metals Advantages such as high strength-to-density ratio, good machining ability, and weldability of magnesium alloys make them excellent candidates in both structural and nonstructural applications where the weight is of primary importance. Wrought magnesium alloys, having the advantage of better mechanical properties, can be used in some application areas such as window frames and seat frames. This opens up research interest in the development of new wrought magnesium alloys [6]. Slip and twinning mechanisms of these alloys were investigated by using the modeling technique [7] and by performing compression tests [8] Their deformation behaviors were studied by using different techniques such as the equal-channel-angular-extrusion (ECAE) technique [9]. Analyses were done on microstructure, microhardness, tensile and compressive properties
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