Ti Hf Research Articles

Effects of spark plasma sintering on enhancing the thermoelectric performance of Hf–Ti doped VFeSb half-Heusler alloys

This work presents a study on the thermoelectric properties of ultrafine grained Hf–Ti dual-doped VFeSb half-Heusler (HH) alloys treated by spark plasma sintering (SPS) at different temperatures. The concerned alloys were successfully synthesized by arc/induction melting and mechanical alloying (MA). Thermoelectric (TE) properties of Fe(V0.8Hf0.2)1-xTixSb (x = 0.0, 0.2, 0.4) HH samples were studied over the temperature range from 100 to 900 K. Hf and Ti as heavy elements were used as dopants to create point defects aiming to reduce the material's thermal conductivity by enhancing the phonon scattering. Since the transport properties of HH alloys are sensitive to heat treatment, the effect of sintering temperature is studied as well. It was found that the power factor is significantly improved by increasing the sintering temperature. As a result, the figure of merit was enhanced by ~10% for the Fe(V0.8Hf0.2)0.8Ti0.2Sb sample and by ~30% for the Fe(V0.8Hf0.2)0.6Ti0.4Sb sample which were sintered at 1123 K, compared to those sintered at 1023 K. The maximum value was recorded at 0.33 for the sample Fe(V0.8Hf0.2)Sb. This value is higher than that of the singly doped FeV0.9Hf0.1Sb sample with a maximum zT value of 0.08. Also, it is higher than the reported value of the FeVSb doped with Ti which shows maximum ZT of 0.174 calculated for FeV0.7Ti0.3Sb at 658 K.

Improvement of Ti6Al4V-Alloy Wear Resistance by Electric-Spark Hafnium Carbide Coatings

In this paper, we obtain cermet coatings with a thickness of 19 to 22 μm by the method of electrospark treatment of titanium alloy Ti6Al4V in a mixture of titanium granules with hafnium carbide powder. An increase in the volume fraction of hafnium carbide powder in the mixture of granules from 2.4 to 6.7 vol % led to an increase in the concentration of the hafnium carbide phase HfC in the coatings. The coating structure is represented by a metallic Ti–Hf–C binder with large inclusions of hafnium carbide. The average microhardness of Ti–HfC coatings was in the range of 7.1–8.3 GPa, which is 2–2.5 times higher than that of the Ti6Al4V alloy. Wear tests in dry sliding mode showed that Ti–HfC coatings had a wear rate in the range from 3.18 × 10–6 to 1.5 × 10–5 mm3/(N m), which is 25 to 250 times higher than that of Ti6Al4V titanium alloy.

Optimizing the thermoelectric performance of FeVSb half-Heusler compound via Hf–Ti double doping

FeVSb-based half-Heusler (HH) compound has recently been identified as promising medium-high temperature thermoelectric (TE) materials for power generation applications. In this study, enhanced thermoelectric performance of Fe(V0.8Hf0.2)1-xTixSb (x = 0.0, 0.2, 0.4, 0.5, 0.6) HH alloys by Hf–Ti dual-doping was reported studied in a temperature range from 100 to 900 K. A high content of Ti doping not only optimized the carrier concentration but also reduced the lattice thermal conductivity, which all contribute to high zT. As a result, a zT value was increased by ~20% at 873 K for Fe(V0.8Hf0.2)0.8Ti0.2Sb compound. Hf–Ti dual doping significantly reduced the lattice thermal conductivity due to enhanced point defect scattering which is mainly attributed to mass fluctuations. Hence, suppressed the material's total thermal conductivity. A reduction of ~20% was obtained for the Fe(V0.8Hf0.2)0.8Ti0.2Sb sample, compared with the single Hf-doped FeVSb sample and of ~80% compared to FeVSb at room temperature.

Ti3C2 MXene nanosheet/TiO2 composites for efficient visible light photocatalytic activity

In the present work, we report a high activity Ti3C2 MXene nanosheet/TiO2 (Ti3C2/TiO2) composite photocatalyst synthesized by a solvent-thermal method using tetrabutyl titanate (Ti(OBu)4) as Ti source and HF as assistant. The Ti3C2/TiO2 composites were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV–Vis spectroscopy (UV–vis), fluorescence spectrometer (PL) and N2 adsorption-desorption. The photocatalytic performance of the Ti3C2/TiO2 composites was explored for the degradation of rhodamine B (RhB) under visible light irradiation. The results showed that more highly-active (001) crystal surfaces of TiO2 were exposed in the Ti3C2/TiO2 composites assisted by HF. The composite consisted of TiO2 microspheres and multilayer Ti3C2 exhibited optimal photocatalytic performance with relatively large specific surface area, large photocurrent and much lower impedances as compared to commercial TiO2 (P25) and pure TiO2. The optimized sample exhibited a degradation rate of 93.7% in 60 min, which was 20.5-fold higher than that of P25. The addition of the Ti3C2 effectively increased the lifetimes of the Ti3C2/TiO2 composites and suppressed the recombination of the electron-hole pairs. The density functional theory (DFT) calculations also revealed that the photogenerated electrons in the composites flowed from TiO2 to Ti3C2. The Schottky barrier at the TiO2–Ti3C2 interfaces effectively inhibited the electronic reflow to TiO2. The as-developed new Ti3C2-based complex with high photocatalytic activity under visible light irradiation might have effective and feasible application in the treatment of dye-containing wastewater.

Additively Manufactured NiTi and NiTiHf Alloys: Estimating Service Life in High-Temperature Oxidation.

In this study, the effect of the addition of Hf on the oxidation behavior of NiTi alloy, which was processed using additive manufacturing and casting, is studied. Thermogravimetric analyses (TGA) were performed at the temperature of 500, 800, and 900 °C to assess the isothermal and dynamic oxidation behavior of the Ni50.4Ti29.6Hf20 at.% alloys for 75 h in dry air. After oxidation, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to analyze the oxide scale formed on the surface of the samples during the high-temperature oxidation. Two stages of oxidation were observed for the NiTiHf samples, an increasing oxidation rate during the early stage of oxidation followed by a lower oxidation rate after approximately 10 h. The isothermal oxidation curves were well matched with a logarithmic rate law in the initial stage and then by parabolic rate law for the next stage. The formation of multi-layered oxide was observed for NiTiHf, which consists of Ti oxide, Hf oxide, and NiTiO3. For the binary alloys, results show that by increasing the temperature, the oxidation rate increased significantly and fitted with parabolic rate law. Activation energy of 175.25 kJ/mol for additively manufactured (AM) NiTi and 60.634 kJ/mol for AM NiTiHf was obtained.

High-Temperature Cermet Material Based on Intermetallic Nickel Matrix

A method for synthesis of an intermetallic nickel matrix reinforced with particles of different refractory compounds added at different concentrations is considered. Prepared materials are based on two variants of a Ni3Al–Cr–W–Mo–Ti–Hf alloy: type VKNA-1V alloy and type VKNA-1V alloy with increased tungsten content (VKNA-1V(W)). The intermetallic matrix is reinforced with nanoparticles of the oxides Al2O3, Al2O3 ⋅ Y2O3, and Al2O3 ⋅ Y2O3 ⋅ HfO2, with the content of reinforcing component at 2 and 5 vol %. Samples are compacted by spark plasma sintering. The microstructure of prepared cermet materials (CMs) is investigated using scanning electron microscopy. The impact viscosity and flexural strength are determined. We establish the effect that the content and composition of the reinforcing component has on the physicomechanical properties of the high-temperature CMs based on an intermetallic matrix dispersion-hardened with refractory metal particles. Our findings show that the optimal combination of flexural strength and impact viscosity at room temperature is achieved in the CM sample in which the intermetallic matrix is based on VKNA-1V(W) alloy and the reinforcing component is represented by ternary oxide Al2O3 ⋅ Y2O3 ⋅ HfO2 added at a concentration of 2%.

Characterization of Thermomechanically Processed High-Temperature Ni-Lean NiTi–20 at.% Hf Shape Memory Wires

The thermomechanical processability of Ti(Hf)-rich Ni49.8Ti30.2Hf20 (at.%) high-temperature shape memory alloy (HTSMA) wires was examined. Hot-extruded rods with an initial diameter of 6.35 mm were hot-rolled and cold-drawn into a final diameter of 260 µm. For all samples, processing was performed in open air without extrusion canning. The HTSMA rods were processed to an area reduction of 99.83%. Experimental results showed that hot-rolling at 800 °C decreased the grain size and introduced a small amount of retained austenite, while breaking up the Ti4Ni2Ox intermetallic oxide phase, resulting in a 10 °C decrease of the austenite start temperature (As). While both hot-rolling and cold-drawing exhibited clear effects on the thermomechanical properties, neither the number of hot-rolling passes nor the number of cold-drawing passes affected the transformation temperatures of the material. Additionally, the NiTiHf HTSMA showed similar thermomechanical responses after the 5th and 25th hot pass when subjected to room temperature loading to 500 MPa (uniaxial tension) and thermally induced shape recovery.

Trace Element Composition of Igneous and Hydrothermal Magnetite from Porphyry Deposits: Relationship to Deposit Subtypes and Magmatic Affinity

AbstractThe trace element composition of igneous and hydrothermal magnetite from 19 well-studied porphyry Cu ± Au ± Mo, Mo, and W-Mo deposits was measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and then classified by partial least squares-discriminant analysis (PLS-DA) to constrain the factors explaining the relationships between the chemical composition of magnetite and the magmatic affinity and porphyry deposit subtypes. Igneous magnetite can be discriminated by relatively high P, Ti, V, Mn, Zr, Nb, Hf, and Ta contents but low Mg, Si, Co, Ni, Ge, Sb, W, and Pb contents, in contrast to hydrothermal magnetite. Compositional differences between igneous and hydrothermal magnetite are mainly controlled by the temperature, oxygen fugacity, cocrystallized sulfides, and element solubility/mobility that significantly affect the partition coefficients between magnetite and melt/fluids. Binary diagrams based on Ti, V, and Cr contents are not enough to discriminate igneous and hydrothermal magnetite in porphyry deposits.Relatively high Si and Al contents discriminate porphyry W-Mo hydrothermal magnetite, probably reflecting the control by high-Si, highly differentiated, granitic intrusions for this deposit type. Relatively high Mg, Mn, Zr, Nb, Sn, and Hf but low Ti and V contents discriminate porphyry Au-Cu hydrothermal magnetite, most likely resulting from a combination of mafic to intermediate intrusion composition, high chlorine in fluids, relatively high oxygen fugacity, and low-temperature conditions. Igneous or hydrothermal magnetite from Cu-Mo, Cu-Au, and Cu-Mo-Au deposits cannot be discriminated from each other, probably due to similar intermediate to felsic intrusion composition, melt/fluid composition, and conditions such as temperature and oxygen fugacity for the formation of these deposits.The magmatic affinity of porphyritic intrusions exerts some control on the chemical composition of igneous and hydrothermal magnetite in porphyry systems. Igneous and hydrothermal magnetite related to alkaline magma is relatively rich in Mg, Mn, Co, Mo, Sn, and high field strength elements (HFSEs), perhaps due to high concentrations of chlorine and fluorine in magma and exsolved fluids, whereas those related to calc-alkaline magma are relatively rich in Ca but depleted in HFSEs, consistent with the high Ca but low HFSE magma composition. Igneous and hydrothermal magnetite related to high-K calc-alkaline magma is relatively rich in Al, Ti, Sc, and Ta, due to a higher temperature of formation or enrichment of these elements in melt/fluids.Partial least squares-discriminant analysis on hydrothermal magnetite compositions from porphyry Cu, iron oxide copper-gold (IOCG), Kiruna-type iron oxide-apatite (IOA), and skarn deposits around the world identify important discriminant elements for these deposit types. Magnetite from porphyry Cu deposits is characterized by relatively high Ti, V, Zn, and Al contents, whereas that from IOCG deposits can be discriminated from other types of magnetite by its relatively high V, Ni, Ti, and Al contents. IOA magnetite is discriminated by higher V, Ti, and Mg but lower Al contents, whereas skarn magnetite can be separated from magnetite from other deposit types by higher Mn, Mg, Ca, and Zn contents. Decreased Ti and V contents in hydrothermal magnetite from porphyry Cu and IOA, to IOCG, and to skarn deposits may be related to decreasing temperature and increasing oxygen fugacity. The relative depletion of Al in IOA magnetite is due to its low magnetite-silicate melt partition coefficient, immobility of Al in fluids, and earlier, higher-temperature magmatic or magmatic-hydrothermal formation of IOA deposits. The relative enrichment of Ni in IOCG magnetite reflects more mafic magmatic composition and less competition with sulfide, whereas elevated Mn, Mg, Ca, and Zn in skarn magnetite results from enrichment of these elements in fluids via more intensive fluid-carbonate rock interaction.

Study of the Structure and Properties of High-Temperature Shape-Memory Alloys of the Ti–Pd–Ni and Ni–Ti–Hf Systems

Abstract—Comprehensive studies on retrieving information about the elemental and local phase composition, phase transition temperatures, and mechanical and thermomechanical characteristics of high-temperature shape-memory alloys of the Ti–Pd–Ni and Ni–Ti–Hf systems in the as-received condition and after thermal treatment have been carried out. The results of this study are necessary for the development of various safety devices used in nuclear power facilities.

Septenary Zr–Hf–Ti–Al–Co–Ni–Cu high-entropy bulk metallic glasses with centimeter-scale glass-forming ability

A new Zr35Hf17.5Ti5.5Al12.5Co7.5Ni12Cu10 high-entropy bulk metallic glass with glass-forming ability up to centimeter scale (diameter of 18 mm) and configuration entropy of 1.77R was discovered. This high-entropy bulk metallic glass differs from previous ones because it was designed to possess a non-equiatomic eutectic composition and was free from Be. The high-entropy alloy exhibited excellent glass-forming ability despite its lower reduced glass transition temperature than those of prototypical glasses. Molecular dynamics simulations suggested that the excellent glass-forming ability was caused by the similar magnitude of the decrease in Hamiltonian from amorphous to crystalline phases to that of a reference ternary bulk metallic glass, as well as the sluggish crystallization of the high-entropy bulk metallic glass.

Molybdenum and boron isotope evidence for fluid-fluxed melting of intraplate upper mantle beneath the eastern North China Craton

Fluid-fluxed melting of the mantle is the principal mechanism for the generation of arc magmas above subduction zones, but it has rarely been documented as important in intraplate settings. Here, we present new molybdenum (Mo) isotopic data from a suite of well-characterized Cenozoic basalts from the eastern North China Craton (NCC) to constrain the mechanisms of mantle melting in the region. These basalts represent mixtures of three components, namely, nephelinites and basanites that variably mixed with alkali basalts. The alkali basalts have relatively low δ98/95Mo ranging from −0.56‰ to −0.22‰ relative to the NIST3134 standard, suggesting the presence of dehydrated pelagic sediments in their mantle source rocks. Interestingly, the basanites range to higher δ98/95Mo (−0.04 ± 0.02‰) compared with the nephelinites (−0.31‰ to −0.22‰) with no associated changes in their radiogenic isotopes, and they show trends of decreasing Dy/Yb, Ce/Mo and δ11B with increasing Ba/Nb and B/Nb ratios. These correlations indicate that Mo behaves as a fluid-mobile trace element in the intraplate mantle beneath the NCC, and that the mantle sources of the nephelinites and basanites were infiltrated by this fluid component. Existing data show that this fluid component has lower H2O/Ce ratios (110–130) than that of mid-ocean ridge basalts (H2O/Ce ≈ 200). This result, together with the low-SiO2 contents, relative depletion of Zr–Hf–Ti, and high δ66Zn characteristics of these strongly alkaline rocks, suggests derivation from a carbonated mantle source. Mo and B isotope systematics thus reveal carbonated fluid-fluxed mantle melting occurred beneath the eastern NCC. Increasing fluid inputs led to increases in the degree of melting of the mantle source that generated melts ranging in composition from nephelinite through basanite. The origin of such a fluid flux is enigmatic in an intraplate setting, but could be related to the decarbonization of subducted slabs stalled in the deep mantle.

Tracing mechanism of optically and thermally stimulated luminescence in Lu2O3:Tb,M (M = Hf, Zr, Ti) ceramic storage phosphors

A series of energy storage phosphors, Lu2O3:Tb,M (M = Hf, Zr, Ti), were investigated by means of photo- and thermoluminescence techniques to compare the effect of the co-dopant from the same group of periodic table of elements on charge carriers trapping capability and trap parameters. Most of the investigated processes were tracked individually for the Tb3+ in the two different metal sites offered by the Lu2O3 host – noncentrosymmetric C2 and centrosymmetric C3i. It is proved that both Tb3+ ions participate in hole trapping and electrons are immobilized in traps whose depths are defined by the co-dopant. Deepest traps, ∼1.79 eV, appear upon Ti addition, while Zr and Hf generate traps of very similar, ∼1.40–1.44 eV, depths. The stored energy may be released not only by means of thermal stimulation but also upon the impact of optical photons. Light from the 390–430 nm range of wavelengths was found the most efficient in the latter process. Also deep red radiation of 780 nm releases most of the trapped electrons in Zr/Hf co-doped ceramics but is much less effective in the case of Tb, Ti material. Consistent scheme of electronic levels engaged in charge carriers trapping and subsequent generation of thermo- and optically stimulated luminescence was constructed.

Composition, Structure, and Mechanical Properties of (Ti–Hf)N Coatings on Titanium Alloy

Variations of the composition, structure, and mechanical properties (hardness, elastic modulus) of (Ti–Hf)N coatings with increasing Hf content (Ti : Hf ratio) are reported. As test samples, VT6 titanium alloy plates covered by a magnetron-sputtered titanium hafnium nitride coating have been taken. To see how the coating characteristics depend on Hf content, samples with rated compositions (Ti0.9Hf0.1)N, (Ti0.85Hf0.15)N, (Ti0.8Hf0.2)N, and (Ti0.7Hf0.3)N have been studied. The surface and depth element distributions have been found, and the phase composition and the dependence of the titanium nitride lattice parameter on Hf content in the coating have been determined. The depth profiling of a coating’s hardness and elastic modulus has been conducted by instrumental indentation. Hardness and elastic modulus have been found to be maximal (~35 and ~500 GPa, respectively) in (Ti0.85Hf0.15)N and (Ti0.8Hf0.2)N coatings. In addition, the depth distribution of Hf in these coatings has turned out to be most uniform.

Состав, структура и механические свойства (Ti-Hf)N-покрытий на титановом сплаве

AbstractVariations of the composition, structure, and mechanical properties (hardness, elastic modulus) of (Ti–Hf)N coatings with increasing Hf content (Ti : Hf ratio) are reported. As test samples, VT6 titanium alloy plates covered by a magnetron-sputtered titanium hafnium nitride coating have been taken. To see how the coating characteristics depend on Hf content, samples with rated compositions (Ti_0.9Hf_0.1)N, (Ti_0.85Hf_0.15)N, (Ti_0.8Hf_0.2)N, and (Ti_0.7Hf_0.3)N have been studied. The surface and depth element distributions have been found, and the phase composition and the dependence of the titanium nitride lattice parameter on Hf content in the coating have been determined. The depth profiling of a coating’s hardness and elastic modulus has been conducted by instrumental indentation. Hardness and elastic modulus have been found to be maximal (~35 and ~500 GPa, respectively) in (Ti_0.85Hf_0.15)N and (Ti_0.8Hf_0.2)N coatings. In addition, the depth distribution of Hf in these coatings has turned out to be most uniform.

Кристаллографические особенности структуры alpha-фазы гафния и сплавов гафний--титан

AbstractThe structure of a hafnium crystal undergoing β → α (bcc → hcp) polymorphic transformation upon gradual cooling and the structure of Hf_55Ti_45 and Hf_30Ti_70 alloys formed under various kinetic conditions of polymorphic transformation are studied. The structure of the α phase in cast hafnium is shown to consist of lath crystals grouped into packets. The misorientations between separate laths in a packet are less than 1°. The Hf–Ti alloys in the cast state exhibit a mixed structure consisting of α-phase crystals of several morphological types. A structure of packet martensite is observed in the Hf–Ti alloys after quenching. Each packet includes laths of several crystallographic orientations. There is no regular alternation of differently orientated laths in the packet. The same set of α-phase orientations within an initial β-phase grain is observed independently of the cooling rate of the Hf–Ti alloys upon β → α polymorphic transformation. The misorientation of substructural elements within an α-phase crystal in the Hf–Ti alloys is ~5° for the cast state and ~2.2° after quenching.

Crystallographic Features of the α-Phase Structure in Hafnium and Hafnium–Titanium Alloys

The structure of a hafnium crystal undergoing β → α (bcc → hcp) polymorphic transformation upon gradual cooling and the structure of Hf55Ti45 and Hf30Ti70 alloys formed under various kinetic conditions of polymorphic transformation are studied. The structure of the α phase in cast hafnium is shown to consist of lath crystals grouped into packets. The misorientations between separate laths in a packet are less than 1°. The Hf–Ti alloys in the cast state exhibit a mixed structure consisting of α-phase crystals of several morphological types. A structure of packet martensite is observed in the Hf–Ti alloys after quenching. Each packet includes laths of several crystallographic orientations. There is no regular alternation of differently orientated laths in the packet. The same set of α-phase orientations within an initial β-phase grain is observed independently of the cooling rate of the Hf–Ti alloys upon β → α polymorphic transformation. The misorientation of substructural elements within an α-phase crystal in the Hf–Ti alloys is ~5° for the cast state and ~2.2° after quenching.

ESBD Analysis of the Structure of Cast and Quenched Hafnium–Titanium Alloys

This paper presents the results of investigation of alloys Hf–45% Ti and Hf–70% Ti structures which were formed under different kinetic conditions of the β → α (bcc → hcp) polymorphic transformation occurence. We used methods of metallography and EBSD analysis during our investigation. We have shown that the Hf–Ti alloys in the cast state exhibit a mixed structure consisting of α-phase crystals of several morphological types: large plates, groups of small parallel plates, and fine crystallites of the shape close to polyhedral. The α-phase structure of the Hf–Ti alloys after quenching consists of martensite crystals grouped into packets. In each packet, there are several crystallographic orientations of 12 possible orientations corresponding to Burgers orientation relationships, and no regular alternation of different orientations of the α phase were revealed in the packet. Irrespective of the cooling rate of the Hf–Ti alloys upon the β → α polymorphic transformation, within the initial β-phase grain, the same set of orientations of the α phase occurs. In the studied Hf–Ti alloys, the misorientation of substructure elements within the α-phase crystal reaches ~5.0° for the as-cast state and ~2.2° after quenching.

Mixing Enthalpies of Liquid Cu–Hf–Ti Alloys Studied by High-Temperature Calorimetry

The partial enthalpies of mixing of titanium and hafnium in liquid Cu–Hf–Ti alloys were investigated at 1873 K along the xCu/xHf = 3 (at xTi = 0–0.25) and xCu/xTi = 3 (at xHf = 0–0.5) sections by a hightemperature isoperibolic calorimeter. The limiting partial enthalpy of mixing of supercooled liquid titanium in liquid Cu–Hf alloy is 2.0 ± 1.5 kJ/mol. The limiting partial enthalpy of mixing of supercooled liquid hafnium in liquid Cu–Ti alloy is –43.0 ± 4.5 kJ/mol. The integral mixing enthalpies of components along the investigated sections are calculated by integrating the Gibbs–Duhem equation. The integral mixing enthalpy is negative in the investigated composition range. The comparison of our experimental results with the calculations according to Miedema’s model shows that this model’s prediction for the ΔmixH function should be treated with caution.

Rapid mechanochemical synthesis of titanium and hafnium carbides

The mechanically triggered interactions in the Ti–C and Hf–C systems performed in a high-energy planetary ball mill are studied. The formation of carbides (TiC and HfC) in the course of mechanochemical synthesis at the different stages is followed by both conventional and synchrotron X-ray diffraction analyses and high-resolution scanning and transmission electron microscopy. The mechanism of the mechanochemically induced reactions in the Ti–C and Hf–C systems leading to the relatively rapid formation of TiC and HfC, respectively, is proposed. The interaction between metallic Ti (Hf) and C proceeds through the formation of mechanocomposites Ti/C (Hf/C) at the first stage, followed by the melting of titanium (hafnium), the spreading it over the carbon particle surface and the crystallization of titanium (hafnium) carbides. It is demonstrated that the mechanosynthesis of ultra-fine TiC and HfC is completed after 20 and 8 min of mechanical activation, respectively.

Strength design of Zr(x)Ti(x)Hf(x)Nb(x)Mo(x) alloys based on empirical electron theory of solids and molecules

In this paper, the valence electron structure parameters of Zr(x)Ti(x)Hf(x)Nb(x)Mo(x) alloys were calculated based on the empirical electron theory of solids and molecules (EET), and their performance through these parameters were predicted. Subsequently, the alloys with special valence electron structure parameters were prepared byarc melting. The hardness and high-temperature mechanical properties were analyzed to verify the prediction. Research shows that the influence of shared electron number nA on the strongest bond determines the strength of these alloys and the experiments are consistent with the theoretical prediction.