Valence Electron Concentration Research Articles

Mathematical modelling for prediction of Young’s modulus in compositionally complex alloys

A generic mathematical model-based bottom-up approach for high throughput materials development of compositionally complex alloys is established in this study. A general bottom-up technique, in contrast to a top-down approach, entails property selection, element screening, structure identification, and fabrication. The application is used to guide the property selection. The alloy design depends on the screening of contributing elements depending on the necessary property. The usage of mathematical models could help with element screening to meet the property requirement. The properties of the resulting compound alloys may be determined by the attributes of compositionally complex alloys. As a result, developing a model that links the needed attribute to the most important aspects of compositionally complex alloys is critical. The Young’s modulus, which is the considered attribute, is predicted using a predictive mathematical modelling approach based on its relationship with the features: valence electron concentration and average melting temperature. Monte Carlo Simulation is also used to discover the optimum feasible composition in order to improve Young’s modulus.

Entropy stabilization of two-dimensional transition metal dichalcogenide alloys: A density functional theory study

As high-entropy alloying provides an increasingly important avenue for widening the set of functional materials for a variety of applications, it is useful to uncover synthesis routes that do not rely on large temperatures for achieving entropic stabilization. Focusing on transition-metal dichalcogenides, we present direct computational evidence from density functional theory calculations that high-entropy disulfide (HES) alloys with five cations from groups 4–6 are thermodynamically stable at temperatures routinely achievable in conventional deposition systems. While all 126 sulfide combinations with five group 4–6 transition metals are thermodynamically favorable at low (<800 K) or medium (<1200 K) temperatures, we show that electronegativities, valence electron concentrations, and atomic radii of cations can help predict whether an HES alloy is stable in the 1-H or the 1-T structure. Furthermore, replacing one of the five cations with another, from outside groups 4–6, can still yield HES alloys with nearly planar layer morphologies and stabilization temperatures below 1200 K, albeit with some localized defects. These results demonstrate that a wide range of stable HES alloys can be synthesized experimentally as 2D layers, thereby providing facile ways for expanding the materials’ space with potential applications in electrochemical devices, catalysis, energy storage, or sensing.

Crystal structure, electronic structure and phase stability of the Cu2-xMxCd (M=Zn, Ga, Ge, Sn) pseudo-binary Laves phases: effect of valence electron concentration

Starting from Cu2Cd, a series of compounds with the approximate formula Cu2-xMxCd (x ​∼ ​0.1–1) (M ​= ​Zn, Ga, Ge, Sn) were prepared by high temperature solid state synthesis. X-ray diffraction and energy dispersive X-ray spectroscopy were used for structure determination, phase analysis and compositional study. A correlation between the valence electron concentration (VEC) and phase stability was noticed in Cu2–xMxCd (M ​= ​Zn, Ga, Ge, Sn). A slight incorporation of M (M ​= ​Zn, Ga, Ge, Sn) for Cu into Cu2Cd (C14, MgZn2 type) leads to the formation of a solid solution of cubic γ-brass type Cu5Cd8 as a major phase. Further incorporation of M leads to the appearance of MgCu2 (C15) type cubic Laves phase as the major phase. The cubic Laves phases are stable within a narrow homogeneity range. At higher atomic percentage of M, the stable pseudo-binary cubic phase ceases to form and binary compounds start to appear. One ordered configuration from each of the four systems was constructed to calculate the density of states (DOS) and crystal orbital Hamilton population (COHP) in order to explain the stability and bonding characteristics of the pseudo-binary Laves phases applying first principles density functional theory. These phases are electronically stable and poor metallic in nature; where partially covalent hetero-atomic bonds have significant contribution towards the overall stability and bonding.

Effects of Cr/Fe Ratio on Structural Evolution and Tensile Properties of the Fe75.7−xCrxNi15.1Al4.6Ti4.6 High‐Entropy Alloys

According to the effect of valence electron concentration (VEC) on the phase evolution of high‐entropy alloys (HEAs), Fe75.7−xCrxNi15.1Al4.6Ti4.6 (at%, x = 17.1, 18.9, 20.6, 22.3, and 25.3) HEAs are designed. Effects of the Cr addition on the microstructure and tensile properties are investigated systemically. As the Cr/Fe ratio increases (i.e., decreasing VEC), there is a phase transition from face‐centered‐cubic (FCC) to body‐centered‐cubic (BCC) and Heusler‐type β′ ‐Ni2TiAl (L21). When x is between 17.1 and 22.3, the alloys, with the mixed structure of the FCC and BCC/L21 phases, behave like composites with a sharp increase in strength but reduced ductility. When x = 25.3, the alloy, with only BCC/L21 phases, becomes extremely brittle. Specifically, Fe56.8Cr18.9Ni15.1Al4.6Ti4.6 exhibits a good combination of a high strength of 1142 MPa and an elongation strain of 9.5%. The excellent tensile properties of this alloy are attributed to the synergetic effects of a soft FCC phase, a hard BCC phase, and the uniform distribution of high‐density L21 nanoparticles in BCC matrix. The phase‐evolution principle is delineated by parameters of the VEC and the atomic size difference (δ), and the strengthening mechanism is well discussed. These findings offer a guidance for the development of BCC/L21‐containing HEAs for practical applications.

Design of TiZrNbTa multi-principal element alloys with outstanding mechanical properties and wear resistance

Body-centered cubic (BCC) multi-principal element alloys (MPEAs) have drawn particular attention as orthopedic implant materials recently, due to their high strength and excellent biocompatibility. However, these alloys often exhibit limited tensile ductility and relatively high Young's modulus, which remain challenges for their potential biomedical applications. In this work, a synergistic design of high-performance biomedical MPEAs based on the principles of valence electron concentration theory and average shear modulus mismatch for solid-solution strengthening is reported. Three TiZrNbTa MPEAs (Ti45Zr45Nb5Ta5, Ti42.5Zr42.5Nb5Ta10, Ti40Zr40Nb5Ta15) with different Ta content were designed. All the alloys exhibited single BCC structure and possessed outstanding tensile ductility (≥18.8%), as well as low Young's modulus (59.3±2.1–73.1±1.0 GPa). The yield strengths of these alloys are increasing with the increase of the Ta content, which can be correlated with the average shear modulus mismatch. In particular, Ti40Zr40Nb5Ta15 alloy exhibits the highest yield strength (∼990.0±14.3 MPa) and high wear resistance for biomedical applications. Theoretical calculation suggested that the strength of the TiZrNbTa alloys is mainly attributed to the solid-solution strengthening effect, and increasing the Ta content can effectively enhance this effect.

Understanding Stability of FeTiVNi and CoFeVNi High Entropy Alloys Using Density Functional Theory

The research based on High Entropy Alloys (HEAs) has increased significantly due to the fact that HEAs contain numerous primary elements, allowing for a much greater variety of their compositions than conventional alloys. We have investigated two HEAs namely, FeTiVNi and CoFeVNi for their structural and electronic properties that include total energy minimization, equilibrium lattice parameter a0, Density of States (DOS), partial Density of States (pDOS) and band structure of the systems. To predict the stable phase of the alloys, we have calculated atomic size difference (δ) and Valence Electron Concentration (VEC) parameters empirically. The results from empirically calculated parameters and the total energy minimization agrees that stable phase for FeTiVNi HEA is body centered cubic (bcc) and for CoFeVNi is face centered cubic (fcc). The findings show that these HEAs have metallic phases with overlapping bands near fermi region.

A Strategic Design Route to Find a Depleted Uranium High-Entropy Alloy with Great Strength

The empirical parameters of mixing enthalpy (ΔHmix), mixing entropy (ΔSmix), atomic radius difference (δ), valence electron concentration (VEC), etc., are used in this study to design a depleted uranium high-entropy alloy (HEA). X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to assess the phase composition. Compression and hardness tests were conducted to select alloy constituents with outstanding mechanical properties. Based on the experimental results, the empirical criteria of HEAs are an effective means to develop depleted uranium high-entropy alloys (DUHEAs). Finally, we created UNb0.5Zr0.5Mo0.5 and UNb0.5Zr0.5Ti0.2Mo0.2 HEAs with outstanding all-round characteristics. Both alloys were composed of a single BCC structure. The hardness and strength of UNb0.5Zr0.5Mo0.5 and UNb0.5Zr0.5Ti0.2Mo0.2 were 305 HB and 1452 MPa, and 297 HB and 1157 MPa, respectively.

Solid-State Hydrogen Storage Properties of Ti–V–Nb–Cr High-Entropy Alloys and the Associated Effects of Transitional Metals (M = Mn, Fe, Ni)

Recently, high-entropy alloys (HEAs) designed by the concepts of unique entropy-stabilized mechanisms, started to attract widespread interests for their hydrogen storage properties. HEAs with body-centered cubic (BCC) structures present a high potential for hydrogen storage due to the high hydrogen-to-metal ratio (up to H/M = 2) and vastness of compositions. Although many studies reported rapid absorption kinetics, the investigation of hydrogen desorption is missing, especially in BCC HEAs. We have investigated the crystal structure, microstructure and hydrogen storage performance of a series of HEAs in the Ti–V–Nb–Cr system. Three types of TiVCrNb HEAs (Ti4V3NbCr2, Ti3V3Nb2Cr2, Ti2V3Nb3Cr2) with close atomic radii and different valence electron concentrations (VECs) were designed with single BCC phase by CALPHAD method. The three alloys with fast hydrogen absorption kinetics reach the H/M ratio up to 2. Particularly, Ti4V3NbCr2 alloy shows the hydrogen storage capacity of 3.7 wt%, higher than other HEAs ever reported. The dehydrogenation activation energy of HEAs’ hydride has been proved to decrease with decreasing VEC, which may be due to the weakening of alloy atom and H atom. Moreover, Ti4V3NbCr2M (M = Mn, Fe, Ni) alloys were also synthesized to destabilize hydrides. The addition of Mn, Fe and Ni lead to precipitation of Laves phase, however, the kinetics did not improve further because of their own excellent hydrogen absorption. With increasing the content of Laves phase, there appear more pathways for hydrogen desorption so that the hydrides are more easily dissociated, which may provide new insights into how to achieve hydrogen desorption in BCC HEAs at room temperature.

Refractory Metal Intermetallic Composites, High-Entropy Alloys, and Complex Concentrated Alloys: A Route to Selecting Substrate Alloys and Bond Coat Alloys for Environmental Coatings.

This paper considers metallic ultrahigh-temperature materials (UHTMs) and the alloying behaviour and properties of alloys and their phases by using maps of the parameters δ (based on atomic size), Δχ (based on electronegativity), and valence electron concentration (VEC), and discusses what connects and what differentiates material groups in the maps. The formation of high-entropy or complex concentrated intermetallics, namely 5-3 silicides, C14 Laves and A15 compounds, and bcc solid solutions and eutectics in metallic UHTMs and their co-existence with “conventional” phases is discussed. The practicality of maps for the design/selection of substrate alloys is deliberated upon. The need for environmental coatings for metallic UHTMs was considered and the design of bond coat alloys is discussed by using relevant maps.

Martensitic Transformation and Barocaloric Effect in Co-V-Ga-Fe Paramagnetic Heusler Alloy

In the present study, polycrystalline Co50V34Ga16−xFex (1≤x≤2) quaternary Heusler alloys were fabricated by the arc-melting method. It was found that they undergo a paramagnetic martensitic transformation (MT) from the L21-type cubic austenitic structure to the D022 tetragonal martensitic structure. With the increase of the Fe concentration, the MT shifts towards a higher temperature range, which is strongly related to the variation of the valence electron concentration. Moreover, it was also found that the MT exhibited by every alloy is sensitive to the applied hydrostatic pressure due to a relatively high difference in volume between the two phases. By using the quasi-direct method based on caloric measurements, the barocaloric effect (BCE) associated with the hydrostatic pressure-driven MT was estimated in the studied alloys. The results demonstrated that the sample with x=1.5 performs an optimal BCE among these three alloys.

Controlled Valence Electron Concentration Approach to Tailor the Microstructure and Phase Stability of an Entropy-Enhanced AlCoCrFeNi Alloy

Controlled Valence Electron Concentration Approach to Tailor the Microstructure and Phase Stability of an Entropy-Enhanced AlCoCrFeNi Alloy

Stability and mechanical properties of single-phase quinary high-entropy metal carbides: First-principles theory and thermodynamics

We have employed thermodynamics and first-principles density-functional calculations to investigate the structural stability and mechanical properties of fifty-six quinary high-entropy metal carbides composed of carbon and Groups IVB, VB, and VIB refractory transition metals, Ti, Zr, Hf, V, Nb, Ta, Mo, and W, thirty-eight of which have not yet been synthesized. To determine the stability of the quinary high-entropy metal carbides, we have constructed a three-dimensional phase diagram in terms of the average melting point, mixing enthalpy, mixing entropy, and lattice size difference, from which we predict that it is feasible to synthesize 38 new high-entropy metal carbides. We have further found that all the 56 metal carbides would have unique mechanical properties of high hardness and high fracture toughness. In addition, our study suggests that the brittleness of high-entropy metal carbides steadily decreases with the increase of the valence electron concentration.

Bipolar high‐power impulse magnetron sputtering synthesis of high‐entropy carbides

AbstractIn this study, we report high‐entropy carbides synthesis with reactive bipolar high‐power impulse magnetron sputtering (HiPIMS). Uncontrolled microstructure and stoichiometry development with reactive gas flow rate are major limitations of conventional direct current (DC) and radio frequency (RF) magnetron sputtering of multicomponent carbides. With HiPIMS these chemically disordered crystals structurally and compositionally transform from a carbon‐deficient metallic (C/M < 1), to a stoichiometric ceramic zone (C/M ∼ 1), and to a nanocomposite embodiment (C/M > 1), as a function of the carbon content during HiPIMS deposition. X‐ray diffraction, X‐ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and nanoindentation hardness measurements are combined to demonstrate the three regions of synthesis domain. HiPIMS provides access to metallic, ceramic, and composite carbides with great control over the microstructure and stoichiometry, which is elusive in case of conventional DC and RF magnetron sputtering. Notably, the stoichiometric ceramic zone maintains a constant carbon to metal ratio (C/M ∼ 1) over an extended amount of methane flow before transitioning to a nanocomposite microstructure (C/M > 1). The transition zone breadth depends on materials affinity for carbon that correlates with valence electron concentration (VEC). As such, synthesis conditions for new high‐entropy carbides can be understood and predicted based on VEC.

Effects of cooling rate on martensitic transformation behavior and shape memory property for Ni-rich NiTiHf-Nb high-temperature shape memory alloy

The NiTiHf-Nb alloy exhibits good workability as well as high-temperature shape memory property. In this work, effects of cooling rate on martensitic transformation behavior and shape memory property for Ni-rich (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 alloy were investigated. For comparison, the martensitic transformation behavior and shape memory property of Ni 50.1 Ti 34.9 Hf 15 alloy were also investigated. As the cooling rate decreased from water cooling to furnace cooling after solution treatment, the martensitic transformation temperatures (TTs) of (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 alloy decreased gradually, whereas the decrease was not obvious for Ni 50.1 Ti 34.9 Hf 15 alloy. The increased valence electron concentration (c v ) should account for the decrease in TTs of (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 alloy. The shape memory effect strain increased with the decrease in the cooling rate for both two alloys, and the largest shape memory effect strain of 2.6% can be obtained in furnace-cooled (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 alloy. This enhancement in the shape memory property should be ascribed to the precipitation of H-phase in furnace-cooled (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 alloy. • Higher shape memory effect strain could be obtained by slow cooling after solution treatment. • Higher martensitic transformation temperatures could be obtained by fast cooling after solution treatment. • The martensitic start transformation temperatures were c v dependent. • Precipitation of H-phase could be improved by addition of Nb.

Combinatorial development of multicomponent Invar alloys via rapid alloy prototyping

To develop novel Invar alloys in the practically infinite compositional space of multicomponent alloys, rapid alloy prototyping is used to investigate five multicomponent Invar alloys with 5 at.% addition of Al, Cr, Cu, Mn and Si to a super Invar alloy (Fe63Ni32Co5; at.%), respectively. All alloys show abnormally low thermal expansion coefficients below the Curie temperature and saturation magnetization deviating from the Slater-Pauling curve, revealing their Invar-behavior. The relationships among valence electron concentration, magnetic properties, and Invar behavior of the various multicomponent alloys are discussed. The Invar alloy with Cu addition is particularly promising, as it shows a 40 K larger temperature range (above room temperature) of low thermal expansion coefficient (<5.87×10−6 K) and slightly higher hardness compared to the conventional super Invar alloy. The work thus also successfully demonstrates the capability of using rapid alloy prototyping for developing multicomponent multi-functional alloys.

The Tb‒Hf‒Al‒Si system (600 C)

Information about systematic investigations of quaternary intermetallic systems with rare-earth elements is scarce, therefore studies of such systems are relevant. Alloys of the Tb‒Hf‒Al‒Si system are promising for the creation of new functional materials thanks to their mechanical (due to the presence of Al in the samples), heat-resistant (Hf), semiconductor (Si), magnetic, superconducting, catalytic, and sorption (Tb) properties. The aim of this work was to investigate the Tb‒Hf‒Al‒Si system: establish the phase composition of alloys, search for new phases and determine their crystal structures. Samples of the Tb‒Hf‒Al‒Si system were prepared by arc-melting the elements under a purified argon atmosphere. The alloys were annealed at 600 °C for 7 months in evacuated quartz ampoules, and subsequently quenched in cold water. X-ray powder diffraction data were recorded on a DRON 2.0M diffractometer, Fe K α radiation, a Panalytical X’Pert, Cu K α radiation, and a STOE Stadi P diffractometer, Cu K α 1 radiation. Energy-dispersive X-ray analyses were performed on a Tescan Vega 3 LMU scanning electron microscope. During the investigation of the Tb‒Hf‒Al‒Si system the formation of the quaternary phase (Tb 0.74 Hf 0.26 )(Al 0.48 Si 0.52 ) was established based on X-ray diffraction and energy-dispersive X-ray analysis. The crystal structure of this phase belongs to the TlI type (Pearson symbol oS 8, space group Cmcm , unit cell parameters: а = 4.312(1), b = 10.793(3), c = 3.973(1) Å) with a statistical mixture of Tb and Hf atoms on the I site and a statistical mixture of Al and Si atoms on the Tl site. Based on the results obtained here, the existence in the quaternary system Tb‒Hf‒Al‒Si of extended solid solutions based on other binary, Hf 5 Si 3 (structure type Mn 5 Si 3 , Pearson symbol hP 16, space group P 6 3 / mcm , 10 at. % Tb and 7 at. % Al – (Tb 0.1 6 Hf 0.8 4 ) 5 (Al 0.1 9 Si 0.8 1 ) 3 ), TbAl 2 (MgCu 2 , cF 24, Fd -3 m , 7 at. % Si – (Tb 0 . 94 Hf 0 . 06 )(Al 0 . 90 Si 0 . 10 ) 2 ), TbAl (DyAl, oP 16, Pbcm , 8 at. % Hf and 5 at. % Si – (Tb 0 . 85 Hf 0 . 15 )(Al 0 . 89 Si 0 . 11 )), HfSi (FeB, oP 8, Pnma , 9 at. % Tb and 7 at.% Al – (Tb 0 . 17 Hf 0 . 83 )(Al 0 . 15 Si 0 . 85 )), and ternary, Tb 2 Hf 3 Si 4 (Sc 2 Re 3 Si 4 , tP 36, P 4 1 2 1 2, 18 at. % Al – (Tb 2 . 4 Hf 2 . 6 (Al 0 . 42 Si 0 . 58 ) 4 ), compounds was established. Within the homogeneity ranges of the solid solutions, the value of the valence electron concentration does practically not change. Keywords : Tb‒Hf‒Al‒Si system, X-ray diffraction, energy-dispersive X-ray analysis, solid solution, TlI structure type.

Fibonacci Stoichiometry and Superb Performance of Nb&amp;lt;sub&amp;gt;16&amp;lt;/sub&amp;gt;W&amp;lt;sub&amp;gt;5&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;55&amp;lt;/sub&amp;gt; and Related Super-Battery Materials

In this contribution, two important crystallographic concepts for the formation of a series of block structures associated with channeling have been compared: chemical twinning and crystallographic shear. Twin planes respectively shear planes besides formed channels serve as a sink for charge carriers or, when the oxidation state of metal ions can be reduced, as a reservoir for intercalated lithium. In this way, Wadsley-Roth shear phases such as niobium tungsten oxide exhibit channels for ultra-fast lithium-ion diffusion. They are in focus as anode material for super-batteries, superb in terms of energy respectively power density, charging time, cycle life and safety. It should be noted that the transition metal to oxygen ratio TM/O = 21/55 of the title compound is a Fibonacci number quotient. Also, the crystal lattice can be traced back to Fibonacci geometry. When replacing only 0.0213 tungsten atoms in the formula with less expensive titanium, a TM/O ratio of 0.381966 =ϕ2 can be adapted besides an average valence electron concentration of 2⋅ϕ-2, where represents the most irrational number of the golden mean. The additional disorder caused by even such small titanium replacement and accompanied oxygen vacancies could fasten up the already high lithium diffusion further. Ultrasonic treatment may be applied besides thermal cycling to prepare phase-pure of the highest electrochemical performance. A replacement of oxygen by some fluorine atoms is an obvious synthesis possibility, but the higher binding energy expected between lithium and fluorine in contrast to oxygen may rather hinder than promote lithium diffusion.

Compositionally graded AlxCoCrFeNi high-entropy alloy manufactured by laser powder bed fusion

A high entropy alloy AlxCrCoFeNi (x = 0.07–0.88) coupon with a stepwise compositional gradation was fabricated by laser powder bed fusion (L-PBF) via in situ alloying of the blended metal powders. The chemical compositions, microstructures and mechanical properties of different regions of the coupon were examined to investigate the effect of Al content on the formation of different constituent phases. The maximum Al that can enable crack free printing was observed to be x = 0.5. Microstructural characterization indicates that grain morphologies, textures and phase variations in the graded alloys are closely related to x. Three phases were found across the graded coupon, i.e., face centered cubic (FCC), body centered cubic (BCC) solid solutions, and intermetallic B2. The phase variations can be attributed to the Al-induced lattice distortion and valence electron concentration. Further analysis suggests that the range of duplex FCC+BCC phases region is insensitive to cooling rates and could be mediated by formation of B2 phase. Nanoindentation studies show a steep increase in hardness along with the occurrence of BCC phase.

Structural transformation of MoReRu medium-entropy alloy by carbon addition

The addition of carbon in medium-entropy and high-entropy alloys offers a convenient way to improve their mechanical as well as physical properties. However, no fundamental change in their crystal structures has been found so far. Here we report the observation of structural transformation by adding carbon in the hexagonal MoReRu medium-entropy alloy. It is found that a single face-centered cubic phase exists in MoReRuCx over a wide carbon content range of x = 0.9 to 1.2. Within this phase region, MoReRuCx exhibits both high hardness above 10 GPa and bulk Bardeen-Copper-Schrieffer-like superconductivity, with Tc mainly governed by the electron-phonon coupling strength. We argue that the observed structural transformation is driven by valence electron concentration and local lattice distortion, which suggests that it might also occur in carbon-added high-entropy alloys isostructural to MoReRu.

The effect of cooling rate on structure and corrosion resistance of Fe5CrCuNiMnSi and Fe5CоCuNiMnSi high-entropy alloys

The structure, phase composition, electrochemical behavior, and corrosion resistance of high-entropy alloys Fe5CrCuNiMnSi and Fe5CоCuNiMnSi in as-cast and splat-quenched states were studied. A cooling rate estimated by splat-quenched film thickness was ~ 106 K/s. Selecting the components of the studied alloys was carried out basing on the criteria adopted in the literature for the composition of a high-entropy alloy such as calculations of the entropy and enthalpy of mixing, valence electron concentrations as well as the difference between the atomic radii of the components. Using X-ray diffraction analysis, the phase composition and crystal lattice parameters of the investigated high-entropy alloys were determined. It was established that the as-cast Fe5CоCuNiMnSi alloy is a solid solution with a face-centered cubic lattice, while the as-cast Fe5CrCuNiMnSi alloy contains two solid solutions with a face-centered and solid solution with body-centered cubic lattices. However, both spalt-quenched high-entropy alloys were solid solutions with a face-centered cubic lattice. The values of stationary potentials and areas of electrochemical stability of alloys as well as the density of corrosion currents were determined. It was shown that samples of the Fe5CrCuNiMnSi alloy behaved inertly in corrosion tests both in as-cast and in splat-quenched states.