Alloy Formation Research Articles

Electrode lifetime in resistance spot welding of coated sheets: Experiments and modeling

One of the most important challenges associated with resistance spot welding of coated sheets is short electrode life time. It has been established that the two factors-electrode tip growth and surface alloy formation-each affect negatively on electrode life when considered separately. This study's objectives were to examine the combined effects of these factors and ascertain how they relate to electrode life. Due to this, two electrodes were used to investigate the electrode life when resistance welding galvanized steel: a conventional Cu-Cr electrode with a compressive strength of 800 MPa and a dispersion strengthened copper electrode with a high volume percentage of alumina particles (3.5 %) with a compressive strength of 500 MPa. Electrode life time tests showed that the life of composite electrode (700 weld number) was reduced by about 20 % compared to Cu-Cr electrode (900 weld number). Electrode tip features showed that cracking in Cu-Cr electrode formed at about 200 weld number while in composite electrode this occurred at 600 weld number. The electrode tip cross section revealed the formation of four separate alloy layers at the tips of both electrodes, however the Cu-Cr electrode had significantly higher crack densities and a lower average thickness during life test (45 µm) than the composite electrode (55 µm). It was caused by the higher rate of electrode tip growth in Cu-Cr electrodes, which increased welding current and extended electrode life. A simple model was purposed for electrode life based on Joule heating effect that takes the effects of both electrode tip growth and electrode tip alloy formation in to account. According to the model and experiments when significant interaction occurs at the electrode tip, the some tip growth rate not only isn’t detrimental but also increases the electrode lifetime.

Controlling the Coke Formation in Dehydrogenation of Propane by Adding Nickel to Supported Gallium Oxide

AbstractAtomic layer deposition was applied on mesoporous silica to synthesize a highly dispersed gallium oxide catalyst. This system was used as starting material to investigate different loadings of nickel in the dehydrogenation of propane under industrially relevant, Oleflex‐like conditions. The formation of NiGa alloys was confirmed by X‐ray diffraction analysis and electron microscopy. Surprisingly, the nanoalloys enhanced the selectivity towards C3H6 while decreasing the tendency for coking. Herein, in situ thermogravimetry, and measured mass fractions of carbon revealed that the coking rate was reduced by over 50 % compared to the pristine gallium oxide. Generally, the increased selectivity can be explained by the partial hydrogenation and reduction of the gallium oxide surface. The optimum temperature for the removal of deposited carbon was evaluated by a temperature programmed oxidation. Finally, the best‐performing Ni−GaOx catalyst was employed in a cycled experiment with periodic reaction and regeneration tests. After regeneration, the selected Ni−GaOx catalyst provided a higher yield of propylene compared to the unmodified gallium oxide.

Calculation of formation enthalpies for Alfcc-Xbcc (X=Cr, Fe, Mo, Ta, V and W) binary alloys with MAEAM

The structural properties and formation enthalpies of the Al–Cr, Al–Fe, Al–Mo, Al–Ta, Al–V and Al–W binary systems are investigated by the modified analytic embedded atom method (MAEAM). The procedure to calculate the enthalpies of formation for fcc-bcc crystal structure alloys is given. It can be obtained from the calculations that all formation enthalpies of these binary alloys are negative, and the results of the MAEAM model are in agreement with the literature. The negative formation enthalpies of Al-based binary alloys indicate that the chemical interaction of two components can strengthen the stability of compounds. In addition, the formation enthalpies of stable alloy compounds calculated by the MAEAM are consistent with research. The reliability of the MAEAM model for predicting enthalpy of formation is proved by comparison with experimental data. The effects of the interactions between the constituent atoms were discussed based on the enthalpies of formation and alloy crystal structures.

Study on physical property regulation and high-temperature heat storage properties of Al–Si composite phase change materials prepared by one-step pressing

In this paper, we investigate a metal composite prepared using a one-step pressing method, where Al–Si alloy acts as the phase change materials (PCMs) and Al2O3/AlN serve as the structural support materials. The alloy formation and PCM composite preparation are synthesized in a single step. The study aims to characterize the microstructure, thermodynamic, and thermal properties of the composite material. To assess the heat storage properties of the prepared composite PCMs at temperatures higher than 600 °C, a high-temperature test system is established using a high-frequency induction heater. Additionally, we explore how to improve the issue of liquid leakage under high-temperature conditions. The results demonstrate that Al2O3 and AlN (ceramic materials) exhibit excellent chemical compatibility with Al–Si composite PCMs. After sintering, the ceramic materials form a strong bond with Al–Si, effectively retaining the liquid phase of Al–Si alloy within the composite material. Consequently, the Al–Si composite PCMs do not exhibit high-temperature liquid leakage under elevated conditions. Both Al2O3/Al–Si and AlN/Al–Si composites possess favorable high temperature heat storage properties. The phase change enthalpy of Al2O3/Al–Si composite reaches 400 kJ/kg, with a thermal conductivity of 36 W/(m·K). Similarly, the AlN/Al–Si composite achieves a phase change enthalpy of 404 kJ/kg and a thermal conductivity of 43 W/(m·K). Both composites fulfill the requirements for high-temperature heat storage applications.

Innovative Transformation and Valorisation of Red Mill Scale Waste into Ferroalloys: Carbothermic Reduction in the Presence of Alumina

Primary and secondary mill scales (MSs) are waste products produced by the surface oxidation of steel during the hot (800 to 1200 °C) rolling process in downstream steelmaking. While the primary MS is comprised of FeO, Fe3O4, and Fe2O3 in a range of proportions, the secondary MS primarily contain red ferric oxide (Fe2O3) (red MS). We report a novel route for extracting iron from red MS and transforming it into ferro-aluminium alloys using carbothermic reduction in the presence of alumina. The red MS powder was blended with high-purity alumina (Al2O3) and synthetic graphite (C) in a range of proportions. The carbothermic reduction of red MS-Al2O3-C blends was carried out at 1450 °C and 1550 °C under an argon atmosphere for 30 min and then furnace-cooled. The red MS was completely reduced to iron at these temperatures with reduced iron distributed around the matrix as small droplets. However, the addition of alumina unexpectedly resulted in a significant increase in the number and sizes of iron droplets generated, much higher reactivity, and the formation of ferrous alloys. A small amount of alumina reduction into metallic aluminium was also observed at 1450 °C. There is an urgent need to identify the true potential of industrial waste and the materials within it. This study showed that red MS is a valuable material source that could be transformed into ferro-aluminium alloys. These alloys find application in a range of industrial sectors such as construction, automotive, infrastructure, etc.

Electrochemical behavior and separation of Ce(III) in LiCl-KCl molten salt

In order to improve the utilization of spent fuel, molten salt electrolysis is used to separate lanthanides from spent fuel. The electrochemical reduction mechanism of Ce(III) ions and dynamic properties of Ce(III)/Ce(0) were provided in the LiCl-KCl molten salt by diversified electrochemical techniques. The diffusion coefficient of Ce(III) and the exchange current densities of Ce(III)/Ce(0) on the W electrode were calculated by cyclic voltammetry and linear polarization, and the reaction activation energy was calculated to be 30.8 kJ∙mol−1. The electrochemical behaviors were measured in the LiCl-KCl-CeCl3-K2ZrF6 molten salt on the W electrode and LiCl-KCl-CeCl3 molten salt on the Zr electrode at 753 K. The redox mechanism of Ce(III) ions was studied on the Zr electrode. Compared the reaction at different electrodes, the reduction potential of cerium on the Zr electrode is more correct than that on the W electrode, the underpotential displacement of cerium and zirconium due to the formation of alloy is 0.26 V, which was detecteted using cyclic voltammetry, square wave voltammetry and chronopotentiometry. In addition, the feasibility of extracting Ce on the Zr electrode by potentiostatic electrolysis at −1.9 V and −2.2 V in the LiCl-KCl molten salt. The cathodic deposition output was characterized by XRD and SEM-EDS, Ce-Zr solid solution was derived under the different conditions. Simultaneously, the Ce metal was discovered when the deposition potential at −2.2 V. The ICP-OES results showed that the extraction ratio of was about 94.02 % for Ce(III) after potentiostatic electrolysis at −2.2 V for 5 h.

Effect of High-Pressure Torsion on Phase Formation and Mechanical Properties of a High-Entropy TiZrHfMoCrCo Alloy.

This investigation delved into the alterations in the mechanical properties of a TiZrHfMoCrCo high-entropy alloy due to phase transformations induced by high-pressure torsion (HPT). The alloy's genesis involved levitation melting within an argon atmosphere, presenting two distinct states for analysis: the initial, post-manufacturing state and the state subsequent to HPT treatment. The original alloy featured a composition comprising a singular A2 phase with a bcc lattice and two Laves phases, C15 and C14. The HPT process triggered significant phase modifications: a retention of one C15 Laves phase and decomposition of the bcc phase into two distinct phases exhibiting different bcc lattice parameters. The HPT-induced effect prominently manifests as strong grain refinement. However, scanning electron microscopy (SEM) observations unveiled persistent inhomogeneities at a micron scale both before and after HPT treatment. Thus, grain refinement occurs separately within each of the bcc and Laves phases, visible in the light, dark, and gray areas in SEM images, while mixing does not occur on the scale of several microns. The examination of Ti, Cr, Co, Zr, Mo, and Hf via X-ray absorption spectroscopy (EXAFS) at specific K-edges and L3-edge revealed that the HPT treatment conserves the local atomic environment of metal atoms, albeit with a slight elevation in static disorder. Assessments through microhardness and three-point bending tests demonstrated the material's inherent hardness and brittleness. The microhardness, standing at a substantial value of 600 HV, displayed negligible augmentation post-HPT. However, the microhardness of individual phases exhibited a notable alteration, nearly doubling in magnitude.

Dynamics of Newtonian fluid through curved domain by considering unsteady effects

AbstractCross‐diffusion gradients, such as the Soret and Dufour effects, play a big role in the formation of binary alloys, the movement of oil and groundwater contaminants, and the separation of gas mixtures. Other applications where cross‐diffusion gradients are useful include: Temperature fluctuations cause matter diffusion, known as Soret effects. Concentration gradients drive heat diffusion, or the Dufour effect. This effect is named after its French discoverer. These findings could be applied to many engineering and industrial contexts and have many intriguing and potentially useful effects. Joule heating unites Soret and Dufour's work. The traditional nonlinear differential approach yields enough permutations. Convergent series can be used to solve temperature, velocity, and concentration problems. These changes can occur in temperature, velocity, or concentration. The drawings clarify all about the system's most important qualities and components. A comprehensive analysis of the Nusselt and Sherwood values is also done. After graphing the Nusselt and Sherwood values, they are analyzed. We are discussing computer science. This study found that Hartman number increases reduce one's perception of radial velocity. As Prandtl and Soret molecules increase, fluid temperature decreases. In this study, we employ numerical methods to solve the micropolar fluid flow problem on a stretched and curved disk. Our methods allow us to model fluid flow in three dimensions. We focus on micropolar fluid flow. Applying the necessary transformations to a set of partial differential equations simplifies it into a set of ordinary differential equations. The equations in both sets are transformed using similarities to convert one set of partial differential equations into another set of ordinary differential equations. The gunshot method and the Runge–Kutta algorithm can solve coupled equations numerically. The nondimensional radius of curvature can quantify and characterize many physical phenomena. Strain, microrotation velocity, and fluid velocity are examples. Due to the variances between curved and flat stretched sheets, the border layer strain cannot be neglected. Due to differences in stretching sheets,

Thermodynamics of antimony—selenium alloys formation and evaporation

The thermodynamic functions of alloy formation and evaporation were considered for two particular systems — Sb – Sb2Se3 and Sb2Se3 – Se in connection with the presence of congruently melting compound Sb2Se3 in the antimony—selenium system. The calculations are based on the partial vapor pressure values of the components forming the particular systems. The thermodynamic activity of antimony selenide and selenium as the most volatile components in the systems was calculated based on the saturated vapor pressure values of antimony selenide over the Sb – Sb2Se3 and selenium melts over Sb2Se3 – Se liquid alloys determined by the boiling point method (isothermal variant). Similar functions of the low volatile components in the above systems: Sb in the first system and Sb2Se3 in the latter one was calculated by numerical integration of the Gibbs—Duhem equation using the substitution proposed by Darken. The partial pressures of antimony selenide and antimony over Sb – Sb2Se3 and Sb2Se3 – Se melts were approximated by temperature—concentration relationships. The system is distinguished with a positive deviation from ideality due to the presence of a delamination region in the first system. The partial and integral entropies and enthalpies of the formation of liquid alloys were calculated based on the values of component activities found as the ratio of the partial vapor pressure of an element or compound above the solution to the saturated vapor pressure of a pure element or compound. The partial and integral functions of alloy formation are presented in the form of graphical dependences on the selenium amount in the melt. The obtained thermodynamic constants will replenish the physical and chemical data base and will be used to calculate the boundaries of the vapor— liquid equilibrium fields on the diagram of state, allowing to determine the possibility and completeness of distillation separation of molten systems.

Multi-dimensional PtRu/Co3O4-Activated carbon Nano-Electrocatalyst: Metal–Support Interaction, and electronic contributions towards methanol electrooxidation in alkaline fuel cells

In this work, we report PtRu alloy system supported on Co3O4-activated carbon (Co3O4-C) prepared by direct reduction of H2PtCl6 and RuCl3 solutions as a highly active and durable electrocatalyst for methanol oxidation reaction. The electrochemical activity of the electrocatalysts was evaluated using electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), cyclic voltammetry (CV), and chronoamperometry (CA). The formation of PtRu alloy on the Co3O4-C matrix, as well as their electronic interactions, is confirmed by employing X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The electrocatalysts showed distinct electrocatalytic activity in alkaline medium, depending on whether the catalysts contained PtRu alloy and whether they were supported on the hybrid Co3O4-C, proving their unique contributions to the electrocatalytic reaction. Benefiting from the strong metal-support interaction (SMSI) and electronic interaction between Pt and Ru, the PtRu/Co3O4-C displayed a highly efficient electrocatalytic performance with a mass activity of 6709 mAmgPt-1, a substantial improvement compared to the commercial Pt-based benchmark catalyst, which achieved only 212 mAmgPt-1. Furthermore, the PtRu/Co3O4-C showed excellent stability after 10 000 s, high durability after 500 cycles retaining 94 % of current density, and higher tolerance for CO. This enhanced catalytic performance can be attributed to the small nanoparticle sizes, high dispersion, large ECSA of 102.1 m2/g, and the synergy resulting from electronic coupling interactions.

Demetallation and reduction induced ultra-dispersed PtZn alloy confined in zeolite for propane dehydrogenation

Developing efficient bimetallic Pt-based catalyst is highly desired for propane dehydrogenation (PDH) process. Typical co-impregnation method often results in inhomogeneous distributions of metal species on supports. Herein, we reported a facile method to support PtZn bimetal alloy nanoparticles onto Beta zeolite, mainly existing as highly dispersed Pt1Zn1 alloy species. Zn@Beta was first synthesized by hydrothermal method with the aid of ethylenediamine (EDA), leading to the introduction of Zn atoms into zeolite lattice. An impregnation process was subsequently employed to support Pt species. During this process, skeleton Zn atoms migrated out of the framework and were then reduced together with Pt in flowing H2, leading to the formation of PtZn alloy with mainly Pt1Zn1 structures. Cs-corrected high-angle annular dark-field scanning transmission election microscope and X-ray absorption fine structure analyses revealed that this method was more conducive to the formation of PtZn alloy compared with the co-impregnation method. The obtained catalyst of 0.3Pt1Zn@Beta exhibited initial propane conversion of 36.8% and propylene selectivity of 99.3% combined with low deactivation rate (0.004 h–1) over 24 h with propane WHSV of 4.7 h–1 at 550 °C. The catalyst also exhibited good PDH performance in a long-term reaction (180 h) and robustness during regeneration reactions by simply flushing hydrogen.

Determination of the Boundaries of Region of Metastable ω-Phase in Titanium and Zirconium Alloys

Abstract—The concentration boundary of the formation of the ω-phase in binary titanium alloys with d-metals of 4−11 groups of 4−6 periods were studied by X-ray diffraction analysis. It is established that the ω-phase is formed in all the alloys studied, with the exception of Ti−Zr alloys. It is shown that the minimum concentration limit of the formation of the ω-phase is determined by the position of the curve of the end of the martensitic β → \(\alpha {\kern 1pt} '\)(\(\alpha {\kern 1pt} ''\)) transformation (Mf). For most of the studied titanium alloys, concentrations were determined at which the Ms and Mf points correspond to a temperature of 20°C. The conditions for the formation of the ω-phase in titanium alloys were compared with the conditions for its formation in zirconium alloys.

Experimental and Numerical Study of Shrinkage Formation in Aluminum Alloys

Experimental and Numerical Study of Shrinkage Formation in Aluminum Alloys

Strong Metal‐Support Interactions in ZrO2‐Supported IrOx Catalyst for Efficient Oxygen Evolution Reaction

AbstractThe use of ZrO2 as a support material for IrOx‐based catalysts in oxygen evolution reaction (OER) electrocatalysis was studied using ex‐situ characterization and rotating disk electrode electrochemical testing of supported IrxZr(1‐x)O2 on ZrO2 of varying sizes. The catalyst exhibited high OER mass (specific) activity (712 A ) and intrinsic activity (4.8 mA ) at 1.6 VRHE, attributed to IrxZr(1‐x)O2 alloy formation, an interconnected network of Irx Zr(1‐x)O2 nanoparticles and the presence of Ir(III)/Ir(IV) species throughout the bulk. It also appears to be resistant to Ir dissolution; however, accumulation of O2 bubbles in the catalyst microstructure and minor phase transformation of Ir(III)/Ir(IV) species during OER cause deactivation. Temperature‐programmed desorption indicated a possible link between the observed high activity and higher amounts of adsorbed H2O and desorbed O2 species.

The Effect of Niobium Addition on Properties of Titanium-Based Alloy Fabricated via Mechanical Alloying

The aim of this study was to investigate the effect of niobium addition on phase formation, densification, microhardness and compressive properties of Ti-Nb alloys that possess suitable characteristics as bone fixation device. The mixture of Ti and Nb powders was mechanically alloyed (MA) in a planetary mill for two hours. The effect of Nb addition to Ti was investigated by x-ray diffraction (XRD) analysis. In addition, density, microhardness and compressive behavior of the sintered alloy were also determined by the principle of Archimedes, Vickers microhardness test and compression test, respectively. The results suggested that Nb addition has changed the phase from α-Ti to β-Ti. As the Nb addition was increased from 0 wt.% to 40 wt.%, it is observed that the density of alloy increased from 4.17 g/cm3 to 5.24 g/cm3. The microhardness and compressive modulus were 306.92 HV and 57.06 GPa for Ti-0Nb (wt.%), while the mechanical properties of the alloy dropped to 218.23 HV and 25.88 GPa when the Nb addition was up to 40 wt.%. This trend is similar to the compression strength, which the compression strength for Ti-0Nb (3221 MPa) decreased to 2123 MPa as Nb was incorporated into Ti up to 40 wt.%. It is found that Ti-40Nb possess close resemblance to the Young’s modulus of human cortical bone which lies in the range of 7-30 GPa and exhibit suitable characteristics as bone fixation device.

CO2 Hydrogenation over Fe-Co Bimetallic Catalyst Derived from the Thermolysis of [Co(NH3)6][Fe(CN)6

Reducing the amount of CO2 in the atmosphere is a very important task. Therefore, the development and search for new approaches to the synthesis of catalytic systems, allowing for the catalytic conversion of CO2 into valuable products, is an urgent task. In this work, the catalyst was obtained by the thermolysis of a double complex compound. In this regard, kinetic studies of the parameters of the thermolysis process of double complex salts-[Co(NH)3]6][Fe(CN)6] were additionally determined using isoconversion and model approaches of non-isothermal kinetics. The catalyst was studied using various physicochemical methods—X-ray diffraction (XRD), infrared (IR)-spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). It was shown that, at the stage of catalyst preparation, the formation of a CoFe alloy occurred, while the surface mainly consisted of carbon in sp2-hybridization, and the metals existed in the form of spinel CoFe2O4. It was shown that catalysts based on bimetallic salts were active in the process of hydrogenation of carbon dioxide without a pre-activation stage (CO2 conversion reached 28%, with a specific activity of 4.0 µmolCO2/gMe·s). It was established that it was possible to change the selectivity of the carbon dioxide hydrogenation process by pre-treating the catalyst with hydrogen (selectivity for methane formation in the presence of an unreduced catalyst is 46.4–68.0%, whereas in the presence of a reduced catalyst it is 5.1–16.5%).

EBSD study of variant reorientation, texture, and twin formation in a martensitic NiTi alloy deformed in compression

Martensitic crystallography plays a vital role in the texture evolution and mechanical properties in Nickel-Titanium (NiTi) shape memory alloys when subjected to deformation. However, their microstructural changes during deformation are not well known and understood. In this study, we systematically investigate the stress-induced change of the microstructure of NiTi shape memory alloy under compression using the electron backscattered diffraction (EBSD) technique, and more specifically the variant reorientation, the evolution of textures, and the formation of twins. The EBSD maps reveal that upon strain the martensite morphologies shift from needle to block and their orientations are strongly reinforced along the loading axis. To quantify these microstructural changes, we used the Interaction Work (IW) associated with the lattice distortion of single variant, which provides a good fit with the experimental observation. A strong dependence of reorientation on the pre-textures of the parent B2 grains was also put in evidence. Other plasticity sources were confirmed such as dislocations and deformation twins. The calculations indicate that, for some specific orientations of parent grains, the active deformation twins could be easier for {011}M twin than that of (201¯)M deformation twin, whereas other orientations only favor the (201¯)M deformation twin.

Bimetallic nanoparticles preparation from metallic organic frameworks, characterization and its applications in reclamation of textile effluents

Abstract Herein bimetallic nanoparticles of Co–Mn were prepared using metal-organic framework (CoMn2 (C2O4)3·6H2O) as a starting material. Initially, the bimetallic organic frame work was prepared which was then subjected to pyrolysis to get the desired product. Techniques like scanning electron microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX), X-ray Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the bimetallic nanoparticles. These analyses revealed that the Co–Mn nanoparticles consisted of finely distributed Mn and Co, along with O in the composites. XRD data confirmed the presence of nano-scale ranges and alloy formation between Co–Mn. The nanoparticles were employed as adsorbent for methyl violet adsorption, with optimized conditions found to be pH 9, temperature 333 K, adsorbents dosage of 0.01 g, and 30 min of contact time. The pseudo-second-order kinetic model best described the adsorption kinetics data whereas Langmuir isotherm exhibited the closest fit, with a maximum adsorption capacity of 625 mg/g at 333 K. Thermodynamic parameters indicated endothermic processes, with ΔH° = 15.155 kJ mol−1, and the process to be spontaneous with negative ΔG° values −0.303, −0.831, and −1.886 (kJ mol−1) at 293 K, 313 K, and 333 K, respectively. The ΔS° value of 52.76 J mol−1K−1 suggested increased disorder at the solid-solution interface during adsorption. The adsorbent could be effectively used in reclamation of dyes loaded water as alternative of activated carbon.

Isolating the effect of Co and Ce on Ni–X–Y/Al2O3 bi- and trimetallic reforming catalysts for hydrogen generation

This work investigates the individual and combined promoting effects of ceria and cobalt on a nickel-based catalyst for steam reforming. First, the catalysts were synthesized using a fixed 20 wt% Ni content and variable Ce and Co, 0-10 wt% contents. We used a combined experimental (characterization and testing) and computational framework to assess the promoting role in catalytic activity and stability for nickel-alumina-based catalysts. The formation of Ni-Co alloy was approved by combining different characterization techniques. The Ni20Ce2Co10/Al catalyst exhibits superior conversion, H2 yield, and lifetime. The obtained catalytic activity is attributed to the presence of bare Co sites that reduces the Ni crystal size, enhances the accessibility of active sites, promotes the metal–support interaction, and facilitates C-C scission. In addition, the incorporation of Ce with low loading (2 wt %) to Ni-Co interface enhances the accessibility of oxygen vacancy, facilitates the reaction, prevents coke formation and maintains catalytic activity for prolonged lifetime. The simplicity and cost-effectiveness of this proposed catalyst make it an appealing option for scaling up.

Characterisation of hydride formation in as-built and heat treated laser powder bed fused Ti-6Al-4V

Despite the increasing developments in laser powder bed fusion (L-PBF) of titanium, no relationships have been established yet on the hydride formation in the L-PBF titanium alloy Ti-6Al-4V. Nevertheless, insights in the development of titanium hydrides in this particular microstructure are e.g. useful for thermohydrogen processing and to avoid premature failure. Therefore, this work investigated the formation of titanium hydrides in as-built and heat treated L-PBF Ti-6Al-4V. Hydrogen was introduced via electrochemical hydrogen charging until hydrides precipitated. The evolution of titanium hydride formation was observed to be closely related to the microstructure, being associated to the hydrogen solubility and diffusivity in the different crystallographic phases. Investigation by scanning electron microscopy (SEM) and X-ray diffraction (XRD) demonstrated that parallelisms could be drawn to the hydride development in conventionally manufactured pure α and α-β titanium alloys, for as-built and heat treated L-PBF Ti-6Al-4V, respectively. Phase and texture analysis were performed with electron backscatter diffraction (EBSD) to identify the orientation relationships between the original microstructural phases and the formed δ hydrides. It was observed in heat treated L-PBF Ti-6Al-4V that intragranular δ hydrides inside the α grains precipitated according to the 0001α // 11̅1δ orientation relationship. On the other hand, hydrides at grain boundaries developed rather according to the 0001α // 001δ orientation relationship. Furthermore, nuances in hydrogen interaction are highlighted with respect to the conventionally manufactured counterparts.