Abstract
The aim of this work is to study the microstructure of four high entropy alloys (HEAs) produced by large scale vacuum die casting. Al40Cu15Mn5Ni5Si20Zn15, Al45Cu15Mn5Fe5Si5Ti5Zn20, Al35Cu5Fe5Mn5Si30V10Zr10, and Al50Ca5Cu5Ni10Si20Ti10 alloys formed a mixture of different structures, containing intermetallic compound (IC) and solid solution (SS) phases. The phases observed in the casting alloys were compared with the equilibrium phases predicted by Thermo-Calc. The measured densities varied from 3.33 g/cm−3 to 5.07 g/cm−3 and microhardness from 437 Hv to 887 Hv. Thus, the microhardness and estimated strength/density ratios are significantly higher than other lightweight high entropy alloys (LWHEAs).
Highlights
Introductionhigh entropy alloys (HEAs), defining HEAs as alloys of five or more metallic elements in equimolar or near-equimolar concentrations between 5 and 35%
In 2004, Yeh et al [1] and Cantor et al [2] independently published the first papers on highhigh entropy alloys (HEAs), defining HEAs as alloys of five or more metallic elements in equimolar or near-equimolar concentrations between 5 and 35%
Only labels of the equilibrium phases at room temperature (RT) were added to the diagrams, the rest of the phases can be found in the legend
Summary
HEAs, defining HEAs as alloys of five or more metallic elements in equimolar or near-equimolar concentrations between 5 and 35%. Their objective was to stabilize a single-phase SS by reducing. The exceptional properties of HEAs are attributed to the four “core effects”: high entropy, sluggish diffusion, severe lattice distortion, and cocktail effect [3]. These effects are less pronounced in conventional alloys. The mechanical properties of HEAs were compared with commercially engineering alloys, demonstrating potential applications where HEAs outperform conventional alloys [5]
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