Abstract
The scientific paper presents a numerical modeling of the chemical composition for the optimization of the multicomponent light alloys in the Al-Mg-Ca-Si-B system. The effects of the proportion of each chemical element on the main characteristics of the alloy based on the mixture rule and the correlation between the melting temperature and the modulus of elasticity were analyzed numerically. The model results has reveals that even other factors must be taken into account, i.e. the mechanical characteristics which varied significantly with changing of chemical compositions. A compromise was set, by slightly increasing the density to acquire better mechanical characteristics. The selected chemical composition was then used to obtain the new low density alloy. In current research stage we conclude that the as cast alloy comprises an inhomogeneous solid solution and complex oxides. Further studies are ongoing on the experimental alloy in various states (homogenization annealed and processed by plastic deformation).
Highlights
The scientific paper presents a numerical modeling of the chemical composition for the optimization of the multicomponent light alloys in the Al-Mg-Ca-Si-B system
Inspect S equipped with an EDAX Z2e analyzer the microstructure and local chemical composition were studied on metallographic prepared specimens
The microstructure presented in figure 5a reveals a typical as cast dendritic microstructure and chemical compounds
Summary
The scientific paper presents a numerical modeling of the chemical composition for the optimization of the multicomponent light alloys in the Al-Mg-Ca-Si-B system. The selected chemical composition was used to obtain the new low density alloy. Common structural alloys where weight is of main concern are based on a single principal element like Al, Mg or Ti. Common structural alloys where weight is of main concern are based on a single principal element like Al, Mg or Ti These conventional alloys have shown their limits and starting 2004 [1 - 3] a new class of alloys with excellent and customizable characteristics given by their unique composition and microstructure, named high entropy alloys (HEA) is developed. Since the aim of this research was not to obtain a Singlephase solid solution or the entropy, the terminology multicomponent principal element is more adequate for the alloy analyzed in this study. The difficulty in raw material melting and procedural costs make HEA’s currently inaccessible for large structural components using a similar approach, has been studied the possibility to obtain a low density MPEA from the Al-Mg-Ca-Si-B system, using Al as the base chemical element. There are know many aluminum alloys, but only several chemical elements are important as alloying elements in commercial alloys
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