The effects of Co content on the thermal stability, soft-magnetic properties, corrosion resistance and mechanical properties of (Fe1-xCox)86Ni1B13 (x = 0–0.25) amorphous alloys were systematically investigated. Adequate Co addition can significantly increase saturation magnetic flux density (Bs). Extremely high Bs of 1.78–1.92 T was obtained when Co content was added in the range of x = 0.05–0.25.

Due to the intrinsic brittleness of NiAl alloy, its sheets are difficult to fabricate with traditional casting and rolling methods. To solve this problem, a novel NiAl alloy sheet with a special bimodal laminated structure was successfully designed and fabricated via the in-situ solid-state reaction synthesis using pure Ni and Al foils. The mechanical properties of the bimodal laminated NiAl alloy

High Nb-containing TiAl alloys have been widely developed and researched due to low density, high specific strength and stiffness, oxidation, and creep resistance. Nevertheless, high Nb-containing TiAl alloys demonstrate poor machinability owing to low plasticity and ductility. Accordingly, on basis of Kalidindi and Pathak's model, this paper systematically establishes a high-throughput and convenient

The high-temperature deformation mechanisms and processing maps of an equiatomic body-centered-cubic(BCC) structured MoNbHfZrTi refractory high-entropy alloy (RHEA) were studied over the temperatures ranging from 1100 to 1250 °C and different strain rates varying from 10−3 to 0.5 s−1. Flow-stress analyses were performed, using an Arrhenius type relation. The activation energy (Q) for high-temperature

Simulation of lamellar boundary (γ/γ) selection during the transformation of α2’→α2+γ in γ-TiAl alloy has been investigated using an improved 3D Phase Field (PF) model, and the mechanical properties of γ/γ boundaries are evaluated by Molecular Dynamics (MD) simulation. The effects of elastic strain energy and interfacial energy difference among different types of γ/γ interfaces on the occurrence frequencies

In the present paper, the mechanical and functional properties of Ti–V–Al alloy were tailored by adjusting the boron (B) content. In addition, the effect of B content on the microstructure and martensitic transformation behaviors of Ti–V–Al alloys was also explored. The results indicated that the microstructure of Ti–V–Al alloys was sole α'' martensite phase, irrespective of the B content. B was completely

As-rolled and annealed CrMnFeCoNi high-entropy alloys (HEAs) were selected to braze 304 SS by using Ag50Cu as the filler metal (FM) in a vacuum furnace. Intergranular penetration was detected in each joint. To explore the evolvement mechanism of microstructure and performance, three different series of dissimilar joints were prepared and the microstructure and mechanical properties of the dissimilar

This study proposed a multi-component alloy FeCrNiAl0.5 as a candidate materials for structural applications at high temperatures. The phase structure, microstructure and chemical composition of the alloy were characterized. The results show that the alloy possesses only BCC crystal structure consisting of the ordered (Ni,Al) phase and disordered [Fe, Cr] phase. Microstructural observation combined

Titanium aluminide (TiAl) alloys are considered for high-temperature applications at a progressive rate and processing issues become increasingly important. Especially β-solidifying TiAl alloys are subjected to extensive research activities. In our research, we assessed a novel manufacturing technique combining electron beam powder bed fusion (PBF-EB/M) for manufacturing near net shape capsules and

A single-phase body-centered cubic (BCC) HfNbTiZr refractory high-entropy alloy (RHEA) was fabricated by vacuum arc melting. The effect of aging at 450 °C on 80% cold-rolled HfNbTiZr specimens (abbr. as CRA) as well as that on 80% cold-rolled and then recrystallized at 1000 °C for 1 h (abbr. as CRRA) have been investigated. A significant increase of hardness after aging at 450 °C was presented in both

θ-Al13Fe4 forms as a primary Fe-intermetallic compound (Fe-IMC) in the casting processes of most Al alloys. Si is added to Al alloys to improve the mechanical performance of products. Fe-IMCs including (Si doped) θ-Al13Fe4 have nontrivial impacts on the mechanical performances of the solidified Al-based components. Here, we investigate systematically Si solution in θ-Al13Fe4 using ab initio density

To prolong the service life of the blade, a series of [Al-(FeCoNi)12]AlxCr3-x (x = 0,0.5,1,1.5) high-entropy-alloy (HEA) composition is designed based on the cluster-plus-glue-atom model. And the HEAs coating was fabricated on 904L stainless steel by laser cladding. The phase structure, microstructure, microhardness, wear resistance as well as corrosion resistance were measured by XRD, SEM, microhardness

The stability of the structure and composition of the alloy is important in structural materials. Therefore, in this study, the distribution of each element in the CoCrFeMnNi equiatomic high-entropy alloy (HEA), which is considered to have a random distribution, was examined experimentally and theoretically. Furthermore, the effect of ion irradiation at different temperatures on the distribution of

Experimental (neutron and X-ray diffraction, Mössbauer spectroscopy, vibrating sample magnetometry) and theoretical (electronic structure calculations using self-consistent Korringa-Kohn-Rostoker Green's function method) studies were performed on a series of intermetallic σ-phase FeNiV compounds in systematic way. The replacement of iron by nickel was found to be the reason of a reduction in the size

Based on the IN783 alloy of as-received state, post-serviced state and thermal-cycled state, this paper studied the Ni5Al3 phases appearing in the NiAl phase of IN783 alloy by optical microscope, transmission electron microscope. The type and formation process of Ni5Al3 phase were analyzed. The dynamic evolution of the crack initiation and propagation on as-received state and post-serviced state was

NbMoTaW refractory high entropy alloy (RHEA) has shown great potential applications for high temperature components due to its high temperature mechanical strength. However, the brittleness at room temperature hinders its engineering application and further development. To overcome this deficiency, refractory alloying elements with melting temperatures over 1850 °C, i.e., Cr, Zr, V, Hf, and Re, were

In order to improve high-temperature mechanical properties and oxidation resistance of TiAl alloys, Ho element was added into Ti46Al4Nb1Mo alloy. The microstructure, high-temperature tensile property and oxidation behavior of Ti46Al4Nb1Mo alloy with different Ho content (0, 0.15%, 0.3%, atomic percent, hereafter in at.%) were investigated in this study. The results showed that Ho2O3 particles with

In present work, the effect of Y2O3 on tensile properties and fracture behavior of Ti-48Al-2Cr-2Nb alloy at elevated temperature was investigated. The alloys were successively fabricated by induction skull melting. The results revealed that tensile strength and elongation of the Y2O3-bearing TiAl alloy both improved evidently at elevated temperature. The TiAl-Y2O3 alloy still exhibited considerable

The martensitic transformation behavior and microstructure evolutions of the (Ni, Cu, Pd)-rich Ti49.5Ni39-xCu11.5Pdx alloys along with the change of Pd content were investigated. The Ti49.5Ni39-xCu11.5Pdx alloys are composed of orthorhombic B19 martensite and a small amount of cubic Ti2Ni-type Ti2(Ni, Cu, Pd) phase and hexagonal TiNi2-type Ti(Ni, Cu, Pd)2 phase. The λ2 is affected by the increasing

The discontinuous oxidation behaviour of Fe–25Al–5Cr-0.5Zr and Fe–25Al–5Cr-0.5Zr + TiC was investigated at 700 °C in air. The iron aluminides were oxidised for up to 1003 h using thermogravimetric analysis (TGA). DSC measurements were performed to analyse the transition temperature of D03/B2 phase. OLM, SEM/EDX and XRD were utilized to evaluate formed scales and internal protrusions. The results show

The magnetic property and microstructure of as-cast FeCoNiAlx (x = 0.2, 0.4, 0.6, 0.8, 1.0) MEAs prepared by copper mold suction were investigated. For x ≤ 0.6 alloys, the soft magnetic properties monotonously decrease with increasing Al content, while a turning point of improving magnetic property occurs at x = 0.8. XRD result shows that Al addition changes the phase constitution. The alloys (x ≤ 0

The effects of annealing at different temperatures (1053, 1103, 1153 K) on the martensitic transformation (MT) and magnetocaloric effect have been investigated in all-3d-metal Mn50Ni32Co8Ti10 alloy ribbons. In melt-spun ribbons, a coexistence of predominant 5-layer modulated martensite (5 M, monoclinic, space group P2/m) and a small amount of B2-type austenite with a cubic structure is revealed at

The structural and magnetic properties of the rare-earth transition metal compound DyFe11.4Nb0.6 have been investigated over its magnetically order state by variable temperature high resolution synchrotron x-ray diffraction (85 K - 650 K) together with ac magnetic susceptibility (10 K - 300 K), DC magnetization (300 K - 600 K) and heat capacity (2 K - 300 K) measurements. The magnetic ordering temperature

In this research, stoichiometric Pb1-xSmxTe (x = 0, 0.02, 0.04, 0.06, 0.08) nanostructures were synthesized using the hydrothermal technique. The synthesized nanostructures were examined using X-ray diffraction, Raman spectroscopy, scanning and high-resolution transmission electron microscope and photoluminescence spectroscope. The results revealed that the samples were crystallized mainly in a cubic

The oxidation behavior of a Ti5Si3-incorporated MoSiBTiC alloy (38Mo–30Ti–17Si–10C–5B, at.%) was systematically studied in the temperature range of 700–1000 °C. Temperature dependence of oxidation kinetics and oxide scale formation was revealed for this alloy. The oxidation kinetics at 700 °C featured an initial transient stage of weight gain and then switched to weight loss. At 800 °C, the oxidation

First, we solve a semi-classical electronic Boltzmann transport equation and acquire the thermoelectric coefficients for a pure unit cell using the rigid-band approximation. Then, combined with the existing experimental results, we not only reproduce the Seebeck coefficients and electrical conductivity but also yield the carrier concentrations and relaxation time, which cannot be obtained by either

Understanding the thermodynamics of multi-principal element alloys (MPEA), also known as high entropy alloys (HEA) is crucial to addressing their synthesis, properties, stability, materials compatibility, and technological applications. While the thermodynamics of binary and ternary alloys are relatively well investigated both experimentally and theoretically in the last five decades, this is not the

An attempt was made to additively manufacture an Al–Fe binary alloy sample with a hypereutectic composition of 15 wt% Fe using a laser powder bed fusion (LPBF) process. The LPBF-built Al–15Fe alloy sample exhibited a microstructure consisting of a number of melt pools in which regions had locally melted and rapidly solidified due to scanning laser irradiation during the LPBF process. The α-Al (fcc)

The fracture mechanism of sintered Nd-Fe-B magnet was analyzed from the perspective of crystallology. The fracture is observed at the interface between the Nd2Fe14B main phase (MP) and the thin Nd-rich grain boundary phase (TGBP). The determined angle mismatch and lattice mismatch between the MP and TGBP phase indicate an incoherent interface boundary, weakening the binding force between the MP and

It has been shown for 24 metallic alloys that temperature dependences of the relative changes of the shear moduli in the glassy and crystalline states below the glass transition are nearly equal, provided that structural relaxation is absent. This behavior supports the idea that the shear elasticities of glass and its crystalline counterpart are intrinsically interrelated, in agreement with the Interstitialcy

For Ni–Mn–In based alloys, simultaneously achieving large magnetic field-induced transformation temperature shift and low thermal hysteresis is of vital significance to obtain significant magnetocaloric properties. In this work, we employ low content Co doping to tune the magnetostructural transformation parameters and demonstrate large inverse magnetocaloric effect in a Ni48Co1Mn37In14 alloy. It is

A multi-step solution heat treatment regime of a Mo-rich Ni based single crystal superalloy (Alloy Mo) was designed, and the effect of each solution heat treatment step on microstructure, microsegregation degree and phase transformation characteristic temperatures of Alloy Mo was investigated by experimental analysis and dynamic calculation (via DICTRA). Homogenizations of microstructure and Re element

Scanning electron microscopes (SEM) and transmission electron microscopes (TEM) were employed to investigate the topologically close-packed (TCP) phases in an experimental nickel base single crystal superalloy. Orientation relationships between P phase and matrix were found as (010)P//(11‾1)γ and [201]P//[110]γ, in which atomic arrangement of P phase obtains the optimal matching with that of γ/γ’ matrix

The hot deformation behaviour and interfacial microstructure evolution have a critical influence on the hot workability and mechanical properties of bimetal composite. This study investigated the flow performance and interfacial characteristics of 2205 duplex stainless steel/AH36 low carbon steel bimetal composite (2205/AH36 BC) at elevated temperatures, based on the hot tensile tests over the temperature

The challenge of producing high-density TiAl alloys is hereby addressed by a simple pressureless sintering approach. A systematic study has been made on the effect of Sn addition on the sintering densification, microstructure and mechanical properties of Ti–45Al-8.5Nb-0.2W-0.2B-0.02Y alloy. The results show that Sn addition significantly reduces the alloy's melting point, directly affecting the sintering

Ni3Al-based alloys were successfully bonded via transient liquid phase (TLP) bonding technique with a BNi-2 interlayer. The typical joint consisted of three characteristic zones including: athermal solidification zone (ASZ) composed of Ni3B phase, isothermal solidification zone (ISZ) with dual-phase γ+γ′ structure and diffusion affected zone (DAZ) containing borides precipitation. With the increase

In this study, the crystallographic orientation relationship between bcc precipitates and a Ti5Si3 matrix in Mo–50Ti–14Si–6C–6B (at.%) alloy was established. The alloy microstructure consisted of the bcc solid solution, Ti5Si3, Mo5SiB2, and TiC phases. The metal-rich Ti5Si3 phase was formed during a solidification stage, followed by the precipitation of the bcc phase within the Ti5Si3 matrix in the

FeMnSiCrNi shape memory alloy (SMA) undergoes plastic deformation at high temperatures, including 850, 900, 950 and 1000 °C. All the deformed FeMnSiCrNi samples consist of γ austenite and ε martensite, where the orientation relationship between γ austenite and ε martensite is [110]γ//[21¯1¯0]ε. Furthermore, ε martensite increases with increasing deformation temperature. Stacking faults play a predominant

We designed three Al-based cast alloys strengthened by T-Al6Mg11Zn11 intermetallic phases using a eutectic reaction (liquid → α(fcc) + T) in the Al–Mg–Zn ternary system and then fabricated them using solidification processes. Thermodynamic assessment provided target alloy compositions of Al–26.5Zn–21.5 Mg (at%), Al–23.5Zn–22.5 Mg (at%), and Al–13Zn–28Mg (at%) with the α -Al (fcc) phase in equilibrium

The present study is an analysis of different investigations of high entropy alloys in different fields of application and themes, but which converge in the line of mechanical behavior at cryogenic temperatures and high temperatures with the main focus on the microstructure and its constitution potential through thermodynamics. The revised chapters are precisely the thermodynamic and metallurgical

Misch-metal (MM) containing four kinds of rare earth elements of La, Ce, Pr and Nd, leads to the complex multi-main-phase (MMP) structure of MM-based sintered magnets. In order to prepare high-performance MM-based sintered magnets, it is necessary to explore the correlation between the microstructure and properties. Here, the MMP [(Pr, Nd)0.65MM0.35]-Fe-B sintered magnets were prepared by the mixtures

The microstructure and mechanical properties of dissimilar resistance spot weldments between the sheets of 6061-T6 aluminum alloy and St-12 low carbon steel using Al0·5FeCoCrNi high entropy alloy (HEA) interlayers (with the thicknesses of 0.4, 0.7 and 1 mm) were studied and compared to interlayer-free weldment. Although HEA contained Al and Fe, its microstructure showed no evidence of Al–Fe intermetallic

In this work, we have investigated the thermal annealing effect on the physical properties of an AlB2-type ternary intermetallic compound, Tb2Ni0.90Si2.94, that undergoes spin freezing behaviour coexisting with spatially limited antiferromagnetic phase below 9.9 K in as-cast form. Thermal annealing effect is found to result in considerable changes in the magnetic ground state properties of the system