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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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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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Tribological and adhesive properties of the tungsten-doped diamond-like carbon film prepared by double lasers deposition
摘要： The nanosecond and femtosecond lasers were used to ablate the graphite and tungsten targets simultaneously, and the tungsten-doped DLC ?lm with the di?erent tungsten concentration on the strip substrate was prepared. The content of the tungsten in the doped DLC ?lm varied continuously in the horizontal direction and was changeless in the vertical direction. The tungsten content in the doped DLC ?lm increased gradually when it was close to the center axis of the tungsten plasma generated by femtosecond laser. Surface roughness and the critical load of the tungsten-doped DLC ?lm increased with the increasing of tungsten content. On the other hand, the friction coe?cient of the tungsten-doped DLC ?lm decreased ?rstly and then increased when the tungsten content increased gradually. The minimal friction coe?cient was 0.086 when the tungsten content was about 8.07 at.%. The deposition method designed in this experiment also could be used for other doped ?lms in the ?eld of the function ?lms.
关键词： Continuously variated content,Critical load,Tungsten-doped DLC ?lm,Tribological property
更新于2025-09-11 14:15:04