Thickness Of Thin Layer Research Articles

Reducing lateral stair-stepping defects in liquid crystal display-based vat photopolymerization by defocusing the image pattern

Vat photopolymerization-based additive manufacturing (AM) technology has emerging success in efficiently fabricating complex and high-resolution objects. However, the lateral and vertical stair-stepping defects limit vat photopolymerization in manufacturing smooth surfaces, such as optical components. Vertical stair-stepping was mitigated by thinner layer thickness or layer-less fabrication. It is still challenging to reduce the lateral stair-stepping defects caused by the pixelated projection pattern, especially for Liquid Crystal Display (LCD) projection whose pixels are disconnected. To tackle this lateral stair-stepping issue, we propose to defocus the curing image pattern by increasing the gap between the LCD screen and the resin vat. This gap intentionally blurs the disconnected pixels to create a continuous and smooth projection pattern. Experiments verified that the smoothened LCD pattern led to an average 81.2% reduction in surface roughness, which was much more effective than grayscale pixels. The gap between the LCD screen and the resin vat also enabled blowing air to dissipate the heat from LCD and the resin polymerization, reducing the part distortion and printing failure due to the thermal stress. The present approach improved the surface roughness and paved the way for vat photopolymerization in fabricating smooth micro-optics, microfluidic channels, and functional curved surfaces.

Modeling and optimization of a honeycombed adsorbent bed for efficient moisture capture

Adsorption-based atmospheric water harvesting has received significant interest owing to its promise of decentralized water supply and a wide applicability. In this study, the adsorbent bed is specially designed and optimized for efficient moisture capture. A transient three-dimensional non-equilibrium model has been developed that takes both internal and external mass transfer resistances into account. It is found that the simulation results agree better with the experimental results, which indicates the reliability of the model. Then this model was applied to investigate the influence of the adsorbent bed structure, and the operating parameters on the transient distributions of the adsorbent temperature, adsorption kinetics, dynamic up-taken moisture capture, mass transfer resistance and relative capture efficiency of the adsorbent bed. ASLi30 (Activated carbon fiber + Silica gel + 30 wt% LiCl)-vapor is selected as the working pair. It has been found that generally, the effects of the air channel aspect ratio on the investigated indexes are negligibly small. A thinner layer thickness and a smaller air channel length characterize an excellent moisture capture, small vapor transport resistance and faster adsorption kinetics. By considering different parametric variations for performance optimization and the effect of operating conditions, these results provide important insights and design guidelines of adsorbent bed for efficient moisture capture.

Dzyaloshinskii-Moriya interaction in Pt/Co/Ir/Co/Pt synthetic ferrimagnets

We had found nonreciprocity of spin waves in Pt/Co/Ir/Co/Pt synthetic ferrimagnets by Brillouin light scattering technique. It is shown that the main contribution to the nonreciprocity of spin waves is made by the Dzyaloshinskii--Moriya interaction with an energy density D~ 1.7-2.3 erg/cm2. The energy density of the Dzyaloshinsky--Moriya interaction in Pt/Co/Ir/Co/Pt synthetic ferrimagnets is higher than its values in heterostructures with one Co layer Pt/Co(1 nm)/Ir ~1.4 erg/cm2. The D value of synthetic ferrimagnets decreases with increasing thickness of the Co thin layer. Keywords: synthetic ferrimagnets, perpendicular magnetic anisotropy, Brillouin light scattering, exchange interaction, Dzyaloshinskii--Moriya interaction .

Multi-phase field simulation of competitive grain growth for directional solidification

The multi-phase field model of grain competitive growth during directional solidification of alloy is established. Solving multi-phase field models for thin interface layer thickness conditions, the grain boundary evolution and grain elimination during the competitive growth of SCN-0.24-wt% camphor model alloy bi-crystals are investigated. The effects of different crystal orientations and pulling velocities on grain boundary microstructure evolution are quantitatively analyzed. The obtained results are shown below. In the competitive growth of convergent bi-crystals, when favorably oriented dendrites are in the same direction as the heat flow and the pulling speed is too large, the orientation angle of the bi-crystal from small to large size is the normal elimination phenomenon of the favorably oriented dendrite, blocking the unfavorably oriented dendrite, and the grain boundary is along the growth direction of the favorably oriented dendrite. When the pulling speed becomes small, the grain boundary shows the anomalous elimination phenomenon of the unfavorably oriented dendrite, eliminating the favorably oriented dendrite. In the process of competitive growth of divergent bi-crystal, when the growth direction of favorably oriented dendrites is the same as the heat flow direction and the orientation angle of unfavorably oriented grains is small, the frequency of new spindles of favorably oriented grains is significantly higher than that of unfavorably oriented grains, and as the orientation angle of unfavorably oriented dendrites becomes larger, the unfavorably oriented grains are more likely to have stable secondary dendritic arms, which in turn develop new primary dendritic arms to occupy the liquid phase grain boundary space, but the grain boundary direction is still parallel to favorably oriented dendrites. In addition, the tertiary dendritic arms on the developed secondary dendritic arms may also be blocked by the surrounding lateral branches from further developing into nascent main axes, this blocking of the tertiary dendritic arms has a random nature, which can have aninfluence on the generation of nascent primary main axes in the grain boundaries.

Hydrocarbon generation potential, geochemical characteristics, and accumulation contribution of coal-bearing source rocks in the Xihu Sag, East China Sea Shelf Basin

The Xihu Sag is an important petroliferous area in the East China Sea Basin. Petroleum in this sag was generated from coal-bearing source rocks, i.e., coal, carbonaceous mudstone, and mudstone. The lack of detailed studies on the source rocks restricts petroleum exploration. Hydrocarbon generation potential, geochemical characteristics, and relative contribution were assessed using 38 source rock samples and 13 oil/oil sand samples. Results show that source rocks have different hydrocarbon generation potentials. The total organic carbon (TOC), production yield (S1+S2), extractable organic matter (EOM), and total hydrocarbon content suggest that coal has the highest organic matter abundance, followed by carbonaceous mudstone and mudstone. All source rocks are dominated by Type III-II2 kerogen and are, therefore, gas-prone. Biomarker assemblages indicate that the organic matter of coal is mainly derived from terrigenous higher plants with little contribution from phytoplankton, accompanied by strong bacterial modification, which was deposited in an oxidizing depositional environment with a poorly stratified water column. Mudstones, in contrast, have less terrigenous higher plants but higher phytoplankton contributions and were deposited in a more reducing depositional environment. Almost all biomarker parameters of carbonaceous mudstones are between coal and mudstones, suggesting that the organic matter sources and depositional environments for carbonaceous mudstones are between that of the coals and mudstones. The greater phytoplankton contribution to the mudstones is verified by the higher liptinite content. However, the lower organic matter abundance and the lower hydrogen index indicate that vitrinite rather than liptinite is the major hydrocarbon generation maceral. Although coal and carbonaceous mudstone have significantly higher organic matter abundance, more oil-prone kerogen types, and more gold-tube pyrolysis yields, oil-source correlation employing biomarkers and carbon isotopes suggest that mudstones are the major source rocks in the Xihu Sag. This apparent contradiction may be due to the thin layer thickness and limited distribution of the coal. The fact that more contributions of coal and carbonaceous mudstone for oils are found in the western slope belt where coal and carbonaceous mudstone were deposited seems to support this viewpoint. This contradiction may also be caused by the inability of coal to effectively expel the generated high molecular weight hydrocarbons.

Unprecedented cell structure variation in multilayered alternating PS/PMMA foams

The objective of the present work was to study the cell structure variation in multilayered alternating polystyrene/poly(methyl methacrylate) (PS/PMMA) foams with the increase of the layer number. The multilayered PS/PMMA foams were prepared via the combination of the co-extrusion technique and the subsequent batch foaming process with carbon dioxide (CO2) as the foaming agent. Controlled with the layer-multiplying elements (LMEs) in the co-extrusion system, multilayered alternating PS/PMMA stacks with various layers (8, 16, 32, 64 and 128) were prepared. It is found that with the increase in layer number, three types of cell structures were observed: the alternating big-cell/small-cell layers, alternating foam/film layers, and the almost uniform cell structure. It is believed that the layer thickness is a crucial factor in governing the formation and hence the variation of the cell structure. For a higher layer thickness, the foaming of the adjacent PS and PMMA layers are independent on each other, thus generating the alternating big-cell/small-cell layers. For a relatively thin layer thickness, the probable gas transfer from the PMMA layers to PS layers during foaming would hinder the formation of the small cells in PMMA, thus bringing the alternating foam/film layers, i.e., bricklaying-like structure. For a very thin layer thickness, the heterogeneous cell nucleation induced by the incompatible interfaces would be favorable for formation of the uniform cell structure.

Multiphase direct ink writing (MDIW) for multilayered polymer/nanoparticle composites

Additive manufacturing has advantages in freedom of design, rapid prototyping, and waste minimization. However, one bottleneck in 3D printing polymer/nanoparticle composites has been the lack of high-precision structural control, especially without sacrificing manufacturing rates. For the first time, this study demonstrated the design and development of a new additive manufacturing mechanism, the Multiphase Direct Ink Writing (MDIW). By matching the viscosity between polymer solutions/nanoparticle suspensions, an individual line composed of a desirable number of sublayers (i.e., 4, 8, 16, 32, 64, 256, 512) was printed. A thin-ply structure with continuous ink deposition showed a strong dependence upon these layer numbers per printing line or the unit layer thickness. The 64-layered structure showed the highest modulus, strength, and energy absorption at a specific strain of 30% (E30% strain) (i.e., 5 times increase in Young's modulus, 3 times growth in ultimate tensile strength, and 3.5 times improvement in E30% strain compared to the PVA). The enhancement in composite mechanics was due to thin layer thickness that improved the interfacial interactions and nanoparticle distribution homogeneity. The interfacial interactions between layers also facilitated the nanotube alignment and affected the crystallization behaviors. Our MDIW method is compatible with natural-, synthetic- and biopolymers as long as the feedstock rheology is well-managed, showing broad applications in structural systems, thermal insulation, electrical conductivity, optical reflectance, and biomedical scaffolds.

Simultaneous microscopic imaging of thickness and refractive index of thin layers by heterodyne interferometric reflectometry (HiRef)

The detection of spatial or temporal variations in very thin samples has important applications in the biological sciences. For example, cellular membranes exhibit changes in lipid composition and order, which in turn modulate their function in space and time. Simultaneous measurement of thickness and refractive index would be one way to observe these variations, yet doing it noninvasively remains an elusive goal. Here we present a microscopic-imaging technique to simultaneously measure the thickness and refractive index of thin layers in a spatially resolved manner using reflectometry. A coherent laser beam, focussed by a high-numerical-aperture microscope objective and reflected by the sample, is measured using its heterodyne interference with a reference in order to determine the amplitude and phase of the reflected field and thus the complex reflection coefficient. Comparing the results with the theoretically calculated reflection of a thin layer under coherent illumination of high numerical aperture by the microscope objective, the refractive index and thickness of the layer are determined. We present results on a layer of polyvinylacetate with a thickness of approximately 80 nm. These results have a precision better than 10% in the thickness and better than 1% in the refractive index. The measured refractive index is consistent with literature values, and the measured thickness is close to measurements of the same sample by quantitative differential interference contrast. We discuss the significance of these results and the possibility of performing accurate measurements on nanometric layers. Notably, the shot-noise limit of the technique is below 0.5 nm in thickness and 0.0005 in refractive index for millisecond measurement times.

Effect of the post-weld heat treatment temperature on the mechanical properties and microstructure of magnetic pulse welded Al/Fe tubes

Post-weld heat treatment (PWHT) can improve the microstructure and properties of welded joints. Here, the effect of the PWHT temperature on the microstructure and mechanical properties of Al/Fe tube joints manufactured by magnetic pulse welding (MPW) was investigated systematically. The results indicated that PWHT improved the distribution of the chemical composition in the thick transition layer (thickness >10 μm), with only a slight change in thickness. In contrast, the thickness of the thin transition layer (thickness ≤10 μm) increased significantly upon increasing the temperature. Micropores, radial cracks, and axial cracks were repaired to different degrees below 250 °C, but axial cracks propagated in the axial direction when the temperature exceeded 250 °C. The local shear strength 3 mm from the free end reached about 58 MPa, which was almost two times greater than that without PWHT at 250 °C. Once this temperature was exceeded, the shear strength decreased; thus, the optimal PWHT temperature was 250 °C, at which the microstructure and mechanical properties were improved better.

Fabrication and characterization of biodegradable zinc matrix composites reinforced by uniformly dispersed beta-tricalcium phosphate via graphene oxide-assisted hetero-agglomeration

The development of biodegradable Zn matrix composites has been considered a promising approach to achieving enhanced mechanical properties, controllable degradation rate, good biocompatibility, and good osseointegration as orthopedic implants. However, scant literature regarding Zn matrix composites has been reported because of the great difficulty in dispersing the nano-sized bioactive reinforcements uniformly within the Zn matrix. In the present study, a novel and effective method were employed to obtain Zn matrix composites reinforced by uniformly dispersed beta-tricalcium phosphate (β-TCP) via graphene oxide (GO)-assisted hetero-agglomeration and subsequent spark plasma sintering process. A very low-content (0.04 vol%) few-layered GO was used as a coupling reagent to connect the Zn matrix and nano-sized TCP particles. In an appropriate polarity solvent, the negatively charged GO sheets could combine with both the positively charged Zn powder and TCP particles by electrostatic attraction and charge neutralization. Due to the nature of hetero-agglomeration, the flexible GO sheet could adhere to the large Zn powder and attracted a certain amount of TCP particles to form a Zn/GO/TCP sandwich structure by charge neutralization thereby forming a uniform dispersion of TCP particles within Zn matrix. After the spark plasma sintering (SPS) process, the TCP particles incorporated with very thin ZnO layers (thickness of a few dozen nanometers) formed a homogeneous and unique 3D network-like distribution in as-sintered TCP/Zn composites. A unique “snap pea”-like structure was confirmed at the grain boundary of α-Zn grains, which consisted of the TCP particles as “pea” and thin ZnO layer as “pod”. Due to the uniform dispersion of bioactive TCP particles and unique structure of the TCP incorporating grain boundary, as-sintered 3TCP/Zn matrix composites possessed yield strength (YS) of 140.8 ± 7.7 MPa, failure strain of 36.0 ± 2.8%, the moderate degradation rate of 19.1 ± 3.3 μm·y−1 and good cytocompatibility to MC3T3-E1 cells. Moreover, osteogenic differentiation activity evaluation revealed that the addition of TCP could significantly improve the expressions of the osteogenic differentiation-related gene (ALP) in MC3T3-E1 cells, thereby resulting in improved osteogenic capability. Therefore, biodegradable 3TCP/Zn matrix composites fabricated by GO-assisted hetero-agglomeration and subsequent SPS process could be a promising material as orthopedic implants.

Dichromatic properties of a magnetic fluid thin layer

In the paper, we investigate spectral dependence of transmittance of a thin layer of a magnetic fluid with Fe2O3 nanoparticles and transformer oil ITO 100 as base fluid, as a function of its thickness. Thin layer samples of the magnetic fluid with various thicknesses were prepared using standard microscope glass slides and spacers with defined thicknesses ranging from 25 µm to 530 µm. The stable spatial localization of the thin layer was ensured due to the existence of a surface tension emerging at the interface between the magnetic fluid surface and surfaces of the microscope glass slides. The transmittance as a function of the layer thickness was investigated in visible (VIS) and near-infrared (NIR) spectral ranges and spectral dependence of the coefficient of absorption of the magnetic fluid was determined, too. At the same time, the change of color of the layers depending on their thicknesses was evidenced. The results show the transmittance dependence on the thin layer thickness can be used to design magnetic fluid-based passive optical attenuators and filters.

Optimization of horizontal well pattern in low permeability layered reservoir

The southern part of Jin45 fault block is a low permeability layered reservoir with thin oil layer thickness. And the development of horizontal well pattern has good economic benefit in Jin45 fault block. The oil layer distribution of reservoir is quite different. The distribution of main layer is stable, but the distribution of non-main layer is unstable. In this study, through reservoir engineering method and numerical simulation method, the horizontal well pattern direction, well pattern form, well spacing and horizontal well length are optimized to determine the horizontal well pattern of main layer. On this basis, according to the principle of “parallel deployment of horizontal wells and sharing injection-production well pattern”, the horizontal well pattern of non-main layer is preliminarily designed to ensure the development effect and economic benefit to the greatest extent.

Structure and Band Alignment of InP Photocatalysts Passivated by TiO2 Thin Films

Composite materials made by a low-band-gap semiconductor covered by a thin oxide layer are increasingly used in solar cells and photocatalysis. InP/TiO2 heterojunctions show high efficiency because of visible light absorption by the InP component and an efficient migration of photogenerated electrons toward TiO2. The passivating TiO2 film also guarantees stability in humid environments. In this work, we investigate the nature of InP/TiO2 by means of density functional theory calculations, showing that due to strong interface chemical bonds, the formation of an InP/TiO2 junction is a favorable process. Irrespective of the anatase TiO2 surface in contact with InP, (101) or (001), the system behaves as a type II junction, where the TiO2 band edges are lower in energy than InP ones, providing a rationalization for the observed electron–hole separation. We also considered explicitly the role of the TiO2 thin layer thickness, finding that a favorable junction is retained for every thickness of the titania passivating film. The highest efficiency is predicted for film thicknesses of 2–3 nm as this provides a good compromise between favorable band edge alignment and efficient transfer of the photogenerated electrons to the surface.

Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes.

Low permeability and chlorine resistance of normal thin-film composite (TFC) membranes restrict their practical applications in many fields. This study reports the preparation of a high chlorine-resistant TFC membrane for forward osmosis (FO) by incorporating corn stalk-derived N-doped carbon quantum dots (N-CQDs) into the selective polyamide (PA) layer to construct a polydopamine (PDA) sub-layer (PTFCCQD). Membrane modification is characterized by surface morphology, hydrophilicity, Zeta potential, and roughness. Results show that TFCCQD (without PDA pretreatment) and PTFCCQD membranes possess greater negative surface charges and thinner layer-thickness (less than 68 nm). With N-CQDs and PDA pretreatment, the surface roughness of the PTFCCQD membrane decreases significantly with the co-existence of microsized balls and flocs with a dense porous structure. With the variation of concentration and type of draw solution, the PTFCCQD membrane exhibits an excellent permeability with low J(reversesaltflux)/J(waterflux) values (0.1-0.25) due to the enhancement of surface hydrophilicity and the shortening of permeable paths. With 16,000 ppm·h chlorination, reverse salt flux of the PTFCCQD membrane (8.4 g m-2 h-1) is far lower than those of TFCCQD (136.2 g m-2 h-1), PTFC (127.6 g m-2 h-1), and TFC (132 g m-2 h-1) membranes in FO processes. The decline of salt rejection of the PTFCCQD membrane is only 8.2%, and the normalized salt rejection maintains 0.918 in the RO system (16,000 ppm·h chlorination). Super salt rejection is ascribed to the existence of abundant N-H bonds (N-CQDs), which are preferentially chlorinated by free chlorine to reduce the corrosion of the PA layer. The structure of the PA layer is stable during chlorination also due to the existence of various active groups grafted on the surface. This study may pave a new direction for the preparation of durable biomass-derivative (N-CQD)-modified membranes to satisfy much more possible applications.

Secondary reactions suppression during fuel fast pyrolysis in an infrared heating apparatus for the fixed bed pyrolysis process with internals

To probe the primary reaction characteristics in coal pyrolysis, the suppression of secondary reactions was systematically examined and optimized by pyrolyzing a kind of compressed thin-layer coal sample in an infrared (IR) heating device with the high heating rate. The effect of pyrolysis temperature, thin-layer thickness, and reactor structure on product distribution and component was comprehensively examined. In the tested experimental temperature range from 600 to 1000 °C, by reducing the thin-layer thickness to 1.5 mm, the yields of fuel gas and tar increased synchronously, and the volume yields of H2 and CO were improved obviously. By comparing with the pyrolysis of a single thin-layer coal sample and the samples of one piece of coal and one piece of char together, one can see that there were serious interactions between char and volatile, leading to the decrease of tar yield and the increase of its fractions with the high boiling temperature. On this basis, by removing the gas distributor in the adopted pyrolyzer, the tar yield was raised further, reaching the 1.56 times of G–K assay. And its components became much light due to the less pitch generation. Moreover, the tested gas components, such as H2, CO, CH4, and CO2, were greatly promoted. Finally, the results demonstrated the availability of thin-layer coal pyrolysis method and the optimized reactor restructure in the suppression of secondary reactions.

Optical properties of native (anodic) layer on the InAlAs surface of different morphology

The influence of InAlAs/InP(001) heterostructures surface morphology on the optical properties (dispersive refractive index and extinction coefficient) of the anodic layer, formed by the oxidation in low-energy Townsend gas-discharge O2-Ar-containing plasma at room temperature, was studied using atomic force microscopy and ellipsometry methods. High resolution transmission electron microscopy and X-ray photoelectron spectroscopy were used to determine the anodic layer morphology and chemical composition. It is shown that the growth structural defects (pits) on the InAlAs surface, with a density 106–107 cm−2, do not significantly influence the optical properties of the amorphous anodic layers, mainly consisting of In2O3, Al2O3, As2O3 and elemental arsenic quite uniformly distributed over their depth and area. The thickness of thin (≤10 nm) oxide layers on InAlAs is measured at a high accuracy by the nondestructive ellipsometry method using the optical model of a single-layer isotropic film on an absorbing substrate.

Strong light emission from a defective hexagonal boron nitride monolayer coupled to near-touching random plasmonic nanounits.

In this Letter, we demonstrate strong light emission from defective hexagonal boron nitride (hBN) defect centers upon their coupling with disorder near-touching plasmonic units. Based on numerical simulations and characterization results, the plasmonic design at thin layer thicknesses of 20 nm can provide above 2 orders of magnitude enhancement in photoluminescence (PL) spectra. Moreover, this plasmonic platform shortens the luminescence lifetime of the emitters. The proposed design can be easily extended to other plasmonic-emitter combinations where strong light-matter interaction can be achieved using large-scale compatible routes.

Thin layer electrolyte impregnation into porous anode-supported fuel cell by ultrasonic spray pyrolysis

An ultrasonic spray pyrolyzed thin layer electrolyte impregnates into a porous anode and extends the depth of triple phase boundaries (TPBs) to several times that of the dense thin-layer thickness. This process, without an anode functional layer, improves the conventional repeated impregnation that results in anode porosity blocking and difficult extending to the anode/electrolyte interface. A (La0.75Sr0.2Ba0.05)0.175Ce0.825O1.981 (LSBC) electrolyte thin layer (iLSBC) is deposited on a porous La0.3Sr0.7TiO3 (LST) anode by ultrasonic spray pyrolysis using 0.1 M LSBC precursor at a substrate temperature of 450 °C, while controlling the solution flow rate and spray volume. The spray pyrolyzed iLSBC/LST half-cells co-fired at 1350 °C/6 h exhibit no evident second phase in the X-ray diffraction analysis. The depth profile of iLSBC/LST indicates an approximately 2.75 μm-thick layer with the Ce element line scanning showing a significantly higher impregnation depth. Slight lattice distortion among the impregnated region may be due to the iLSBC diffusion, resulting in the extension of the TPB area and length. The half-cell reaches a low impedance and achieves a power density of 377 mW/cm2 at 750 °C.

Direct numerical simulation of electroconvection with thin Debye layer matching canonical experiments

Electroconvection has the potential to be applied in electrochemical technologies such as electrodialysis and energy storage, and has thus aroused considerable research interest. This paper describes the direct numerical simulation (DNS) of the dimensionless Poisson–Nernst–Planck and Stokes equations for electroconvection to determine why the dimensionless thin Debye layer in existing simulations does not match the results of canonical experiments. Our DNS results show that the discrepancy between the simulation results and the experimental data is mainly caused by differences in the structural characteristics of the extended space charge layer. A dimensionless thin Debye layer matching those in canonical experiments enhances the driving force of the extended space charge layer, resulting in massive vortices near the permselective membranes that cause the electroconvective flow to transition from the steady state to time-dependent spatiotemporal dynamics. Our DNS results show that choosing the thickness of the dimensionless thin Debye layer to be consistent with canonical experiments is a key factor in the high-precision quantitative analysis of electroconvection characteristics such as the vortex height, dynamic evolution, and pattern formation. These results provide important guidance for the design and instability control of microfluidic chips.

A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method

Investigation of the selective laser melting (SLM) process, using finite element method, to understand the influences of laser power and scanning speed on the heat flow and melt-pool dimensions is a challenging task. Most of the existing studies are focused on the study of thin layer thickness and comparative study of same materials under different manufacturing conditions. The present work is focused on comparative analysis of thermal cycles and complex melt-pool behavior of a high layer thickness multi-layer laser additive manufacturing (LAM) of pure Titanium (Ti) and Inconel 718. A transient 3D finite-element model is developed to perform a quantitative comparative study on two materials to examine the temperature distribution and disparities in melt-pool behaviours under similar processing conditions. It is observed that the layers are properly melted and sintered for the considered process parameters. The temperature and melt-pool increases as laser power move in the same layer and when new layers are added. The same is observed when the laser power increases, and opposite is observed for increasing scanning speed while keeping other parameters constant. It is also found that Inconel 718 alloy has a higher maximum temperature than Ti material for the same process parameter and hence higher melt-pool dimensions.