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Laser Alloying of Surface of Ti-5.5Al-2Zr-1Mo-1?V Titanium near-α-Alloy Prepared Via Melted by Pulsed Laser Radiation TiC Particles
摘要： Laser alloying of the surface of Ti-5.5Al-2Zr-1Mo-1 V titanium near-α-alloy was carried out in order to improve the surface properties. The surface of the titanium alloy was being melted by pulsed laser radiation while TiC alloying powder component was being supplied to the laser irradiation zone. As a result of laser alloying, partial melting of the powder particles of titanium carbide and mixing them with the substrate metal resulted in the formation of new disperse TiC phases in the form of dendrites and highly dispersed phases. It is shown that laser alloying of Ti-5.5Al-2Zr-1Mo-1 V titanium near-α-alloy by pulsed laser radiation leads to a 1.4 times increase in hardness of the surface of the titanium alloy and reduces friction coefficient 1.2 times.
关键词： Tribological tests,Laser alloying,Microstructure,Titanium alloy
更新于2025-11-21 11:20:48
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The impact of laser surface treatment on the microstructure, wear resistance and hardness of the AlMg5 aluminum alloy
摘要： Light metal alloys due to several unique properties such as low density and high corrosion resistance are increasingly used in various technical applications, where the automotive industry is one of the most important sectors. The automotive applications use mostly aluminum alloys, where the strength to density ratio of the material plays a crucial factor. Unfortunately, relatively low mechanical properties limit their applications for parts where a high surface hardness and wear resistance is expected. The classic heat treatment of aluminum alloys can only in some limited ranges improve the bulk material properties. Despite this, surface treatment with laser processing has developed significantly over the past 20 years. The laser beam treatment allows the introduction of a wide range of alloying elements to the surface layer of an aluminum alloy and thus, as a result of the precipitation of numerous intermetallic phases, significantly increases hardness, and abrasion resistance. The purpose of this work was to modify the aluminum surface layer using high-power fiber laser (HPFL). During this process, a mixture of titanium and iron powders (90/10 wt.%) was introduced onto the surface of the AlMg5 alloy. The microhardness tests carried out by the Vickers method and tribological tests showed a significant increase in mechanical properties in the entire volume of the obtained layer. Research on light and scanning microscopy revealed fragmentation of primary precipitates and the formation of numerous intermetallic phases rich in titanium and aluminum.
关键词： Aluminium alloy,Laser treatment,EDS analysis,Tribological properties,High power fibre laser
更新于2025-09-23 15:19:57
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Hydrothermal-assisted grinding route for WS2 quantum dots (QDs) from nanosheets with preferable tribological performance
摘要： The 2D nanomaterials have achieved the superlubrication property whatever in solid or liquid lubrication in recent years. However, whether or not the nanosheets can stably disperse in oils and smoothly enter into the asperity of friction pairs is crucial for exerting the function of antifriction. The structure of 2D QDs is desirable for addressing these issues due to its smaller 3D size. In this study, we developed a facile preparation process for WS2 QDs with uniform 2nm size from nanosheets via hydrothermal-assisted grinding approach. The structure of the as-obtained WS2 QDs was determined by a series of characterizations. The results showed that the as-obtained WS2 QDs exhibited the typical spectrum features of nanosized quantum dot. The results of the tribological performance in grease verified that the average grease, respectively, exhibiting a preferable friction reducing and wear resistance. friction coefficient (ACOFs) and wear volume (AWVs) were decreased by 7.89% and 63.90% relative to In this work, we successfully developed a facile exfoliation process for WS2 QDs from nanosheets via hydrothermal-assisted grinding approach. The as-obtained WS2 QDs were determined by a series of characterizations. The preparation mechanism of WS2 QDs was proposed. The tribological properties of the as-exfoliated WS2 QDs in grease were intensively evaluated by the reciprocating ball-on-disk mode.
关键词： WS2,Nanosheets,Tribological performance,Quantum dots,Grease
更新于2025-09-23 15:19:57
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Microstructure and properties of TiAlN/AlN multilayers with different modulation periods
摘要： The effects of thicknesses of AlN layer on microstructures and properties of TiAlN/AlN multilayers were studied. TiAlN/AlN multilayers had been deposited on 304 stainless steels by magnetron sputtering system. The microstructure and properties of the multilayers were characterized by X-ray diffraction, vicker hardness tester, atomic force microscopy, and friction abrasion tester. The results show that under “template effect” of TiAlN layer, AlN layer is changed into face-centered cubic and grow epitaxially with TiAlN layer. The superhardness effect could be generated in the region with sharp interface. With the thickness of AlN layer in TiAlN/AlN multilayers, the properties of multilayer are firstly increase and then decrease. When the AlN layer thickness is 3.2nm, the multilayer has excellent properties. The hardness of multilayer is 30.98GPa, the roughness of multilayer is 20.2nm, and the coefficient of friction of multilayer is 0.61.
关键词： Tribological property,Hardness,Modulation period,TiAlN/AlN
更新于2025-09-19 17:15:36
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Improving processing quality and tribological behavior of laser surface textures using oil layer method
摘要： The study proposes an effective oil layer method for improving the processing quality and the tribological behavior of laser textured surface. Experimental results suggest the oil layer method has the reduction effect on the coverage area of metallic oxide and the height of rim ridges/burrs of textures. Possible mechanisms are mainly attributed as: i) the cooling down effect of oil flow; ii) the protecting of oil film to reduce oxidation and adhesion of laser-ablated melt on metal surface. Moreover, tribological tests confirm the favorable effect of textures laser-irradiated using the oil layer method on reducing friction coefficient.
关键词： surface textures,oil layer method,tribological behavior,laser processing
更新于2025-09-19 17:13:59
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Microstructure development, tribological property and underlying mechanism of laser additive manufactured submicro-TiB2 reinforced Al-based composites
摘要： Al-based composites reinforced with submicro-TiB2 particles were manufactured by selective laser melting (SLM) of powder mixture under different laser powers. The microstructure evolution and tribological property of SLM-processed AlSi10Mg/TiB2 composites were investigated. Al-based composites with high manufacturing quality and uniform dispersion of TiB2 particles throughout the matrix were obtained. The EBSD results showed that incorporation of TiB2 reinforcements imposed no appreciable influence on the crystallographic orientation and average grain size, while the grain size distribution was distinctly narrowed as a result of limitation on grain growth by addition of ceramic particles. The SLM-processed composites exhibited a continuous tendency of increasing microhardness and decreasing coefficient of friction (COF) along with wear rate with a laser power increasing from 350 to 450 W. The composites showed high microhardness of 126 HV0.2, exceeding over those of the Al-Si alloys and composites processing by conventional techniques. A low COF of 0.65 and wear rate of 5.2×10?4 mm3N-1m-1 were obtained for bulk-form composites at 450 W due to the combined effects of high manufacturing quality, microstructure homogeneity, and sound interfacial bonding.
关键词： Tribological property,Microstructure development,Selective laser melting (SLM),Al-based composite
更新于2025-09-16 10:30:52
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Production and Tribological Characterization of Tailored Laser-Induced Surface 3D Microtextures
摘要： The aim of the present study was firstly to determine the manufacturing feasibility of a specific surface 3D-microtexturing on steel through an ultra-short pulsed laser, and secondly to investigate the tribological properties under 2 different lubrication conditions: oil-lubricated and antifriction coated. The selected 3D-microtexture consisted of 2 different levels of quadratic micropillars having side dimensions of approximately 45 μm, heights of about 35 μm and periods of 80 μm. It was shown that the production of specific 3D-microtextures on steel substrates using an ultra-short pulsed laser was feasible, and that the reproducibility of the texture dimensions over the entire textured region was extremely good. Frictional investigations have shown that, in comparison to the benchmark (untextured samples), the 3D-microtextured samples do not induce any significant improvements in the coefficient of friction (COF) under oil-lubricated conditions, but that under antifriction coated conditions, significant improvements in the friction coefficients may be achieved. Wear-based tribological tests have shown that the antifriction coating on benchmark samples was completely depleted, which greatly influenced their friction and wear behavior, since steel-steel contact occurred during testing. For the 3D-microtexture, the antifriction coating was also partially depleted; however, it accumulated itself in the microtexture which acted as a potential lubricant reservoir.
关键词： ultra-short pulsed laser,surface characterization,wear,laser microtexturing,tribological,friction,characterization
更新于2025-09-16 10:30:52
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Rapid crystallization of electrohydrodynamically atomized ZrO2 thin films by laser annealing
摘要： This paper aims to provide a simple and rapid fabricating method for solution-based ZrO2 thin films. The ZrO2 thin film was firstly deposited on a 316L stainless steel substrate by electrohydrodynamic atomization. Then the crystallization process was carried out by a 4W Nd:YAG laser with a wavelength of 1064 nm. The morphology, structure and evolution of chemical bonds (Zr and O) were evaluated by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. After laser annealing, the O 1s (O-containing ions in ZrO2) fraction rose from 22.6 % to 51.1 %, and the principal tetragonal phase composition was obtained. The large temperature gradients that derived from the photothermal effect contribute to the fast crystallization during the laser treatments. The tribological and electrochemical corrosion experiments reveal that the laser crystallized films have significantly well wear and corrosion resistance, close to those of conventionally crystallized films. This fabricating method is simple, energy-saving and could achieve the spatially-resolved crystallization of films with a minimal temperature increase on the underlying substrates.
关键词： Laser annealing,ZrO2 thin films,Electrohydrodynamic atomization,Tribological and corrosion properties
更新于2025-09-16 10:30:52
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Enhanced wear resistance and new insight into microstructure evolution of in-situ (Ti,Nb)C reinforced 316??L stainless steel matrix prepared via laser cladding
摘要： An MC (M: Ti,Nb) carbide-reinforced 316 L coating was synthesized in-situ via laser cladding. A strong relationship between the (Ti,Nb)C content and the microstructure and tribological properties of the resulting components was established. This relationship helped explain the in?uence of the (Ti,Nb)C content on the phase evolution, microstructure characteristics, and exothermic reaction behavior. It was found that the size and morphology of in-situ generated (Ti,Nb)C particles changed as the carbide content increased. When the MC carbide content increased from 2.5 wt% to 10 wt%, the morphology of in-situ generated (Ti,Nb)C evolved from irregular geometry particles, to spherical particles, and ?nally into near-regular geometry. When the carbide content reached 15 wt%, the (Ti,Nb)C particles displayed an equilibrium octahedral structure. The calculated formation enthalpy of MC carbides showed that the reaction enthalpy increased with the MC carbide content, which a?ected the dynamic temperature of the molten pool and eventually led to carbides with di?erent crystal morphologies and sizes. Room-temperature dry sliding friction and wear tests showed that the submicron (Ti,Nb)C carbide reinforced (carbide content: 5 wt%) coating and 1.5 ??m regular octahedral particle-reinforced coating (carbide content: 20 wt%) exhibited a lower friction coe?cient and wear volume loss. Understanding the morphological evolution mechanism of (Ti,Nb)C and its corresponding tribological behavior will enable the development of guidelines to obtain (Ti,Nb)C/316 L metal matrix composite coatings produced by laser cladding.
关键词： (Ti,Nb)C,Laser cladding,Tribological behavior,Microstructure,In-situ
更新于2025-09-16 10:30:52
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Effects of single- and multi-shape laser-textured surfaces on tribological properties under dry friction
摘要： Textural morphology is an important factor influencing dry friction, and few studies have been conducted regarding the effects of single- and multi-shape textures on dry tribological properties. In this work, six types of textures including single- and multi-shape textures were produced on 40Cr steel samples by using a nanosecond laser. Reciprocating sliding tests under dry friction were conducted using a pin-on-disc friction tester. The influences of textured surfaces with different textures on tribological properties were investigated. Results showed that tribological properties were affected by different textural morphologies. The dimple-textured surface had the highest friction coefficient, followed by the groove-textured surface. The sinusoidal-textured surface had the lowest friction coefficient. The friction coefficients of multi-shape textured surfaces were lower than those of non-textured surfaces but higher than those of sinusoidal-textured surfaces. The wear properties of the tested surfaces were consistent with the friction-coefficient results. The sinusoidal- and sinusoidal–groove-textured surfaces can be considered as the optimum choices for dry reciprocating friction.
关键词： textural morphology,dry friction,tribological properties,surface texturing,Nanosecond laser processing
更新于2025-09-12 10:27:22