Abstract
The Al-Fe-Cu-Cr-Ni-Ti-B system was microwaved to generate high entropy alloy matrix composites reinforced by TiB2 particles. The micro structure and reaction process of the composites were observed and investigated by modern analysis methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and differential scanning calorimeter (DSC) analysis. The results show that AlFeCuCrNi /TiB2 composites can be prepared by microwave heating method. The matrix structure was FCC, and the reinforcement TiB2 showed regular geometric morphology in the matrix and evenly distributed in the matrix when the volume fraction of the reinforcement is 10%. When the volume fraction of the reinforcement increased to 15%, TiB2 partially aggregates in the matrix, and the system activation energy was 195.69 kJ/mol.
Highlights
Conventional alloys usually have one or two elements as the main elements
The consist of multi-principal high-entropy alloy is at least five elements, each of them takes up a content, ranging from 5% to 35%.This kind of alloy's properties are determined by a variety of principal elements [3]
(ΔG is the change of free energy, H is the mixed enthalpy, T is the thermodynamic temperature, and S is the mixed entropy)
Summary
Conventional alloys usually have one or two elements as the main elements. To meet industrial requirements, researchers add appropriate amounts of other elements to improve the properties of the alloy [1]. In the 1990s, scholar Ye Junwei et al [2] from Taiwan first proposed the concept of multi-principal high-entropy alloy, which attracted attention from domestic and foreign scholars. The consist of multi-principal high-entropy alloy is at least five elements, each of them takes up a content, ranging from 5% to 35%.This kind of alloy's properties are determined by a variety of principal elements [3]. Mixed entropy [7] is an important thermodynamic feature of high-entropy alloys distinguished from traditional alloys. (ΔG is the change of free energy, H is the mixed enthalpy, T is the thermodynamic temperature, and S is the mixed entropy). The high-entropy alloy has high mixed entropy, the free energy of the system can be reduced, and the intermetallic space is largely suppressed. The formation of the compound makes it easier for the alloy to form a solid solution rather than an intermetallic compound when solidified [8]
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