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

In this paper, the glass forming ability (GFA), magnetic properties and magneto-caloric effect (MCE) performances in Er0.2Tm0.2Ho0.2Cu0.2Co0.2 amorphous ribbon were reported. A relatively big supercooled liquid region ~43.1 K and a broad typical ferromagnetic to paramagnetic phase transition around TC ~ 13.5 K accompanied by a large cryogenic MCE were observed in Er0.2Tm0.2Ho0.2Cu0.2Co0.2 amorphous

In the Al–Mg system, intermetallic compounds can be formed by a solid-state reaction between the elemental components. Metal matrix composites obtained by classical powder metallurgy and room temperature extrusion with the two compositions Al60–Mg40 and Al40–Mg60 (wt. %) were studied. The high fraction of Al–Mg grain boundaries in these materials allows investigation of the early stages of phase evolution

Iron-based soft magnetic alloys (FeSiB, FeSiBNb, FeSiBCu, and FeSiBNbCu (Finemet)) have been fabricated via mechanical alloying followed by spark plasma sintering (SPS) process. FeSiB alloy powder was obtained by high energy ball milling of an elemental blend Fe, Si, and B powders. The effect of milling time on crystallite size and phase transformation was studied. Additionally, FeSiBCu, FeSiBNb, and

First-principles calculations were utilized to study the anisotropic in terms of elasticity, sound velocity and minimum thermal conductivity of Al–Cu intermetallic compounds (AlCu, c-AlCu3, o-AlCu3, o-Al2Cu, t-Al2Cu, Al3Cu2 and Al4Cu9). There was good agreement between our calculated lattice constants and previous experimental and theoretical results. The compounds' anisotropy of elasticity was estimated

Au-12Ge(wt.%) eutectic solder is widely used in electronic packaging thanks to its good electrical conductivity, solderability, and chemical stability. To investigate the stability of Au-12Ge solder during high-temperature service, the effects of different isothermal aging conditions on the microstructure and performance of Au/Ni(P)/Kovar substrate after soldering were investigated. Solder joints produced

The mechanical properties, electrochemical behavior, wear and corrosive-wear performance of a Pd40Cu30Ni10P20 bulk metallic glass (BMG) were studied. It is found that the Pd-based BMG shows high hardness of over 500 HV, which is superior to that of conventional biomedical alloys, like the CoCrMo alloy, 316 L stainless steel (SS), and Ti6Al4V alloy. The Pd-based BMG possesses a great corrosion resistance

Fe-based amorphous alloys have been proved to exhibit excellent degradation properties for the removal of copper ions from simulated wastewater. Compared with crystalline iron, amorphous alloy has higher removal efficiency, lower reaction activation energy and high corrosion current density owing to its unique surface mobility. The copper ion can be reduced to less than 0.5 or 1 ppm at different initial

The crystal-electric field and exchange parameters are determined for the (Nd0.5Dy0.5)2Fe14B compound by analyzing experimental magnetization curves obtained in high magnetic fields up to 58 T. The series (NdxDy1-x)2Fe14B compounds were analyzed theoretically to achieve a temperature stability while maintaining a large maximum energy product (BH)max. We demonstrate that computational simulations is

RE–Mg–Ni-based hydrogen storage alloys are new cathode materials of Nickel-metal hydride (Ni-MH) batteries and the improvement of their kinetic performance is meaningful for enhancing the output power of Ni-MH power batteries. In this work, La–Gd–Mg–Ni-based alloys with different type superlattice structures are obtained by a powder sintering method from LaMgNi4 and La0.60Gd0.15Mg0.25Ni3.60 alloys

Ti–48Al–2Cr–2Nb (Ti4822) alloy was manufactured by the electron beam melting (EBM) process, and its microstructure and compressive deformation behavior at room and high temperatures (25, 600, 750, 900, and 1050 °C) were investigated. In addition, plasma-melted Ti4822 alloy was manufactured as a reference material to compare the microstructure and mechanical properties. EBM-built Ti4822 has a near-gamma

Ti20Zr20Hf20Nb20Ta20 high-entropy alloy (TiZrHfNbTa HEA) is considered to be attractive for biomedical applications due to its good mechanical properties and composition that composed of biocompatible elements. In the present study, the bio-corrosion behavior in a simulated physiological environment and in vitro biocompatibility of the TiZrHfNbTa HEA were investigated in comparison with those of the

The processing route of the current TNM alloy (Ti-43.4Al–4Nb–1Mo-0.5B [in at %]) involves casting/HIP'ing plus forging and multiple heat treatments to achieve the required properties. This study seeks to design a modified TNM alloy with superior properties by utilising a simpler processing route, namely casting/HIP'ing plus a single-step heat treatment. The modified alloy composition was melted, cast

In this work, we utilize atomistic simulations to calculate the generalized stacking fault energies (GSFEs), which are related to the dislocation glide process, on four types of slip planes – {110}, {112}, {123}, and {134} – in two refractory multi-principal element alloys (MPEAs): MoNbTi and NbTiZr. To serve as a reference material for MoNbTi, we develop, validate, and employ an A-atom interatomic

Magnetic properties of the R11Pd4In9 compounds (R = Y, Gd–Er) were investigated by means of X-ray diffraction and magnetic measurements. Three of these compounds, namely those with R = Y, Ho and Er, are newly synthesized. The compounds crystallize in the orthorhombic Nd11Pd4In9-type crystal structure (oC48, Cmmm) in which the rare earth atoms occupy five nonequivalent sublattices. Magnetic properties

The B2 phase-containing Bulk Metallic Glass (BMG) composites, as a promising remedy to tackle the strain-softening and brittleness of BMGs, has been widely applied to enhance the work-hardening and plastic deformability. A novel strategy was proposed to select the composition of an alloy which effectively promotes the formation of B2–ZrCo phase. We designed and prepared six compositions and seven rod

In this work, we present a better insight into the grain refining mechanism of Sc addition in an Al-Zn-Mg-Cu-Zr aluminum alloy from experiments and first-principles. It is found a higher concentration of Sc can result in finer grains, but the refining efficiency was sharply decreased when the Sc/Zr ratio(wt.%) exceeds 1. Also, we determined the L12-Al3(Sc, Zr) was formed by Sc displacing Zr in L12-Al3Zr

1.2 Hf and 1.5 Y2O3 (wt.%) were added into CoCrFeNi (CCFN) high-entropy alloy (HEA) to fabricate oxide dispersion strengthened CoCrFeNi (ODS-CCFN) composite by mechanical alloying and spark plasma sintering. Microstructures, including XRD, SEM, EBSD, and TEM of CCFN and ODS-CCFN HEAs were investigated to identify the effects of introducing nano-sized oxides into CCFN HEA. These HEAs compose of FCC

Flow softening behavior, microstructure evolution and hot working parameters of powder metallurgy Ti–44Al–3Nb-(Mo, V, Y) alloy were systematically studied by isothermal hot compression. Based on the analysis of processing maps and the corresponding microstructure, power dissipation efficiency peak occurred at two domains, which were associated with dynamic recrystallization (DRX) and super-plasticity

Structural changes in the Zr55Cu30Ni5Al10 liquid alloy on cooling from above the equilibrium liquidus temperature are studied by synchrotron radiation X-ray diffraction and compared with the results of first-principles molecular dynamics simulation. In-situ vitrification of the studied alloy is achieved using a containerless levitation technique. Subsequent analysis of the atomic and electronic structure

A new thermodynamic model based on the Einstein function with more physical significance is used to describe the hcp, bcc, fcc, ω, liquid and amorphous phases for Ti and V from above the melting point down to 0 K by the CALPHAD (CALculation of PHAse Diagrams) approach for the third generation thermodynamic databases. The liquid and amorphous phases are treated as one phase using the generalized two-state

Ni-Mn-Ga is commonly used as a room temperature shape memory alloy. With the doping of Co and Cu, its phase transformation temperature increased to around 500 K, which can be used as high temperature shape memory alloys, and the superelasticity and shape memory strains are improved as well. Here, giant recoverable strain 16.3% is reported in a Heusler type Ni53Mn24Ga21Co1Cu1 microwire, prepared by

High entropy shape memory alloys (HESMAs) represent a relatively young class of functional materials. They show a reversible martensitic phase transformation which allows to exploit shape memory effects at relatively high temperatures. HESMAs represent ordered complex solid-solutions. Their high temperature phase is of B2 type, and various elements (e.g. Ni, Cu, Ti, Zr, Hf) occupy sites in specific

The mechanical properties of high-entropy alloys (HEAs) strongly depend on their microstructural features. In this work, the phase formation and morphologies of Fe26.7Co26.7Ni26.7Si8.9B11.0 HEAs fabricated under different undercooling levels by the drop tube technique together with subsequent quenching were investigated in detail. It was found when the droplet size decreases (i.e. the increase of the

A nanoscale sigma (σ) phase strengthened Co34.5Cr30Ni26.5Al5.4W3.6 (at, %) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors

The cyclic deformation of four TiAl common microstructures is studied experimentally at room and high temperature. Multilevel and multirate tests are performed to highlight the microstructure impact on the Bauschinger effect and the strain rate sensitivity. The mechanical behaviors are linked to their corresponding deformation mechanisms. Results can directly be used to develop microstructure-sensitive

The Ni70Ga30, Ni70In30, Ni70Sn30 alloys were manufactured by melt spinning technique. The as melt-spun ribbons showed a multiphase microstructure prone to alteration by heat treatment at 800 °C. The average grain size in the as melt-spun ribbons was circa 3–4 μm and it increased after heat treatment; the increase is tenfold in the case of the Ni70In30 ribbon due to its low homologues temperature. The

Activation of the β relaxation of metallic glasses is usually related to the activation of the structure units which correlates with the activation of shear transformation zones. In the present work, a pronounced slow β relaxation behavior was observed around ambient temperature in (La25Ce75)65Al11Co24 metallic glass. Based on the compression tests at 223 K and 300 K, the results demonstrated that

We investigate the microstructure and deformation substructure evolution in an additively manufactured 1.8 at.% N-doped FeCoNiCr high-entropy alloy (HEA) by means of correlative electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI). The combinational use of EBSD and ECCI uncovers hierarchal structures of the HEA at multiple length scales, which consist of a bimodal

The aim of the present work was to study the influence of Gd microaddition on the sequence and temperatures of phase transformations as well as on the microstructural evolution and properties of a new six-component TiAl-based alloy Ti-44.5Al-2V-1Nb-xZr/yCr-(0 … 0.1)Gd (at.%) with variable Zr (x = 0.5–1.5 at.%; eq. 1.2–3.5 wt%) and Cr (y = 1.5–2.5 at.%; eq. 2.0–3.5 wt%) content in the as-cast condition

Relaxation behaviors of highly rejuvenated Zr50Cu40Al10 bulk metallic glass was investigated using synchrotron X-ray scattering coupled with differential scanning calorimetry. The relaxation of rejuvenated volume is found to correspond to a marked exothermic event prior to the glass transition. High-energy synchrotron X-ray measurements of the structure factor show that annihilation of rejuvenated

Powder metallurgy (PM) Ti–22Al–25Nb (at.%) alloy was prepared by spark plasma sintering under the conditions of 950 °C/80 MPa/10 min. Isothermal unidirectional compression experiments of the PM Ti–22Al–25Nb alloy were completed on the Gleeble-3500 thermal–mechanical simulator at temperature and strain rate ranges of 920 °C–1100 °C and 0.001–10s−1, respectively, and a total height reduction of 50%.

Nacre, a biomimetic model system with multiscale architectures and adjustable components, has always inspired researchers to create novel materials with advantages such as light-weight, exceptional strength and toughness. Inspired by nature, nacre-like bionic Ti2AlC/TiAl–Ti6Al4V laminated composite sheets had been designed and fabricated by spark plasma sintering technology using commercial Ti6Al4V

In this paper, the ultrasonic hammering treatment is applied to the lightweight entropic alloy Al80Li5Mg5Zn5Cu5, contributing to the modification of coarse microstructures and the improvement of mechanical properties. The effects of ultrasonic hammering on the microstructures and mechanical properties of Al80Li5Mg5Zn5Cu5 are elaborately studied, and the formation of sub-grains is thoroughly analyzed