A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

Abstract

The exceptional corrosion resistance and mechanical properties of high-entropy metallic glasses (HE-MGs) are highly desirable for diverse critical applications. However, a long-standing problem of these alloys is that their alloy design approaches are based on limited equiatomic or near-equiatomic ratios. In this study, a novel senary alloy (non-equiatomic Fe 3 Cr 2 Al 2 CuNi 4 Si 5) with amorphous structure was prepared. This alloy exhibited exceptional corrosion resistance and Vickers hardness as high as ~ 1150 Hv at room temperature. The processing route involved amorphous powder molding via a mechanical alloying and ultrahigh pressure consolidation technique, resulting in an optimal microstructure of amorphous structure with nanoparticles uniformly distributed in the matrix alloy. This approach can effectively inhibit the crystallization of amorphous structure, thus providing a general pathway for manufacturing next-generation non-equiatomic HE-MGs with both exceptional corrosion resistance and strength.

Corrosion performance and mechanical properties of FeCrSiNb amorphous equiatomic HEA thin film

“…More information can be found within the following citation [37]. This new type of alloys could help to avoid the defects (voids and element segregation) that found in the conventional amorphous alloys where the limited number of principle elements restricts material potential development [4]. This point was further confirmed and discussed in our previous study on an equiatomic FeCrMnNiC thin films [38].…”

“…Therefore, amorphous alloys show a higher wear resistance, fatigue strength and better corrosion resistance than crystalline alloys in many cases according to certain compositions [1][2][3]. This high performance of amorphous alloys has attracted scientists and engineers to use them in applications in the shipbuilding and petroleum industries [4], and in biomedical devices [5]. However, amorphous alloys as conventio na l alloys comprise two, three or more elements based on one or two main elements such as Cubased [6] and Zr-based [7].…”

“…These types of alloys are found to satisfy the target properties in required applicatio ns, for instance to have high corrosion resistance where the absence of grain boundaries could lead to improve the corrosion resistance of the alloy [36]. More information can be found within the following citation [37]. This new type of alloys could help to avoid the defects (voids and element segregation) that found in the conventional amorphous alloys where the limited number of principle elements restricts material potential development [4].…”

In Situ TiC/FeCrNiCu High-Entropy Alloy Matrix Composites: Reaction Mechanism, Microstructure and Mechanical Properties

“…Figure 8c indicates that the content of Cu in the matrix is relatively low, and the segregation of Cu may occur at the grain boundaries. The formation of these distinct regions may be explained by the difference in ∆H mix value between Cu and other atoms [25,26]. Figure 9a shows the microstructure of the TiC/FeCrNiCu (10 vol%) high-entropy alloy matrix composites.…”

Ultrafast Synthesis of High Entropy Oxide Nanoparticles by Flame Spray Pyrolysis

“…Recently, high entropy alloy (HEA) nanomaterials composed of five or more metals have attracted tremendous attention considering their unique and complex physicochemical properties derived from the high configurational entropy of mixing and tunable elemental compositional flexibility . Studies indicate that HEA nanomaterials possess superior properties including enhanced corrosion and wear resistance, thermal stability, superparamagnetic, and mechanical properties. − The increased configurational entropy is proposed to be the main factor contributing to the stability of solid solution in HEA. , The metal oxide NPs composed of multiple principal elements are equally being explored as multifunctional alternatives for antimicrobial, water purification, and catalytic applications. ,, …”