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Influence of layer thickness on formation quality,microstructure,mechanical properties,and corrosion resistance of WE43 magnesium alloy fabricated by laser powder bed fusion

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Journal of Magnesium and Alloys 2024年第4期12卷 1367-1385页

作者： Bangzhao Yin Jinge Liu Bo Peng Mengran Zhou Bingchuan Liu Xiaolin Ma Caimei Wang Peng Wen Yun Tian Yufeng Zheng State Key Laboratory of Tribology in Advanced Equipment Beijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Institute for Precision Medicine Tsinghua UniversityBeijing102218China Department of Orthopaedics Peking University Third HospitalBeijing 100191China Beijing AKEC Medical Co. Ltd.Beijing 102200China School of Materials Science and Engineering Peking UniversityBeijing 100871China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing 100191China

Laser powder bed fusion(L-PBF)of Mg alloys has provided tremendous opportunities for customized production of aeronautical and medical *** thickness(LT)is of great significance to the L-PBF process but has not been studied for Mg *** this study,WE43 Mg alloy bulk cubes,porous scaffolds,and thin walls with layer thicknesses of 10,20,30,and 40μm were *** required laser energy input increased with increasing layer thickness and was different for the bulk cubes and porous *** tended to occur at the connection joints in porous scaffolds for LT40 and could be eliminated by reducing the laser energy *** thin wall parts,a large overhang angle or a small wall thickness resulted in porosity when a large layer thicknesses was used,and the porosity disappeared by reducing the layer thickness or laser energy input.A deeper keyhole penetration was found in all occasions with porosity,explaining the influence of layer thickness,geometrical structure,and laser energy input on the *** the samples achieved a high fusion quality with a relative density of over 99.5%using the optimized laser energy *** increased layer thickness resulted to more precipitation phases,finer grain sizes and decreased grain *** the similar high fusion quality,the tensile strength and elongation of bulk samples were significantly improved from 257 MPa and 1.41%with the 10μm layer to 287 MPa and 15.12%with the 40μm layer,in accordance with the microstructural *** effect of layer thickness on the compressive properties of porous scaffolds was ***,the corrosion rate of bulk samples accelerated with increasing the layer thickness,mainly attributed to the increased number of precipitation phases.

关键词： Magnesium alloy WE43 Laser powder bed fusion layer thickness Process optimization

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Effect of layer thickness and voxel size inversion on leaf area density based on the voxel-based canopy profiling method

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Journal of Forestry Research 2022年第5期33卷 1545-1558页

作者： Yan Chen Jian Liu Xiong Yao Yangbo Deng Zhenbang Hao Lingchen Lin Nankun Wu Kunyong Yu College of Forestry Fujian Agriculture and Forestry UniversityFuzhouFujian 350002The People’s Republic of China

Voxel-based canopy profiling is commonly used to determine small-scale leaf *** thickness and voxel size impact accuracy when using this ***,we determined the optimal combination of layer thickness and voxel size to estimate leaf area density *** LiDAR Stonex X300 was used to generate point cloud data for Masson pines(Pinus massoniana).The canopy layer was stratified into 0.10-1.00-m-thick layers,while voxel size was 0.01-0.10 *** leaf area density of individual trees was estimated using leaf area indices for the upper,middle,and lower canopy and the overall *** true leaf area index,obtained by layered harvesting,was used to verify the inversion *** area density was inverted by nine combinations of layer thickness and voxel *** average relative accuracy and mean estimated accuracy of these combined inversion results exceeded 80%.When layer thickness was 1.00 m and voxel size 0.05 m,inversion was closest to the true *** average relative accuracy was 92.58%,mean estimated accuracy 98.00%,and root mean square error *** combination of leaf area density and index was accurately *** conclusion,nondestructive voxel-based canopy profiling proved suitable for inverting the leaf area density of Masson pine in Hetian Town,Fujian Province.

关键词： Terrestrial LiDAR Leaf area density Pinus massoniana Voxel-based canopy profiling method layer thickness Voxel size

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Effects of layer thickness on desiccation cracking behaviour of a vegetated soil

Biogeotechnics

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Biogeotechnics 2024年第2期2卷 47-53页

作者： Li, Congying Cheng, Qing Tang, Chaosheng Gu, Yingdong Cui, Lingxin Guo, Haowen School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

The objective of this study is to explore how different layer thicknesses affect the desiccation cracking behaviour of vegetated soil. During the experiment, an electronic balance was employed to quantify water evaporation, while a digital camera was utilized to capture the initiation and progression of soil surface cracking. Results indicate that in the early drying process, the rate of evapotranspiration in vegetated soil correlates positively with leaf biomass. For soil samples with the same layer thickness, the constant rate stage duration is consistently shorter in vegetated soil samples than in their bare soil counterparts. As the layer thickness increases, both vegetated and bare soil samples crack at higher water content. However, vegetated soil samples crack at lower water content than their bare soil counterparts. Vegetation significantly reduces the soil surface crack ratio and improves the soil crack resistance. The crack reduction ratio is positively correlated with both root weight and length density. In thicker vegetated soil layers, the final surface crack length noticeably declines. © 2024 The Author(s)

关键词： Desiccation crack layer thickness Root density Vegetated soil

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Dielectric Enhancement and Maxwell—Wagner Effect in Polycrystalline BaTiO3／Ba0.2Sr0.8TiO3 Multilayered Thin Films

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Chinese Physics Letters 2002年第4期19卷 563-565页

作者：葛水兵沈明荣等 DepartmentofPhysics SuzhouUniversitySuzhou215006

Polycrystalline BaTiO3/Ba0.2Sr0.8TiO3 multilayer thin films were fabricated by pulsed laser deposition onto Pt/Ti/SiO2/Si substrates with various stacking periodicities. The dielectric constant of the films was obviously enhanced with the decrease of the individual layer thickness, while the dielectric loss was kept at a low level comparable to that of the pure Ba0.6Sr0.4TiO3 thin films. The Maxwell-Wagner model is used to explain the experimental data.

关键词： Stacking dielectric properties Refractive surgery enhancement thin films Pulsed laser deposition Dielectrics laser deposition Experimental data LOW LEVEL Dielectric losses Films layer thickness Periodicity Dielectric constant

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Effects of Typical Soil and Stratification thickness on Water Infiltration Characteristics in Central Ningxia

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Meteorological and Environmental Research 2024年第4期15卷 58-65页

作者： Tianwen ZHANG Wei CHEN Xiaoying CHEN Rongjun ZHI Lin CHEN Haibo ZHANG Wei LIANG Ningxia Hui Autonomous Region Institute of Mineral Geology Yinchuan 750021China Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems in Northwest China Ministry of Education(Ningxia University)Yinchuan 750021China College of Ecology and Environment Ningxia UniversityYinchuan 750021China

In order to compare the influence of different soil types and stratification on water infiltration capacity,two main types of soil in the desert steppe,sierozem(S)and aeolian sandy soil(A),were selected,and infiltration simulation tests were conducted on homogeneous soil and layered soil(layer thickness 5,10,and 20 cm),*** results show that during the whole experiment,there was a small difference between S5A95(aeolian sandy soil 95 cm thick was covered with sierozem 5 cm thick)and S10A90(aeolian sandy soil 90 cm thick was covered with sierozem 10 cm thick)in the wetting front process,infiltration rate and cumulative infiltration,but there was a significant difference between S5A95 and S20A80(aeolian sandy soil 80 cm thick was covered with sierozem 20 cm thick).In the initial infiltration stage,there was no significant difference between A5S95(sierozem 95 cm thick was covered with aeolian sandy soil 5 cm thick)and A10S90(sierozem 90 cm thick was covered with aeolian sandy soil 10 cm thick).However,with the increase of infiltration time,the wetting front process,A5S95,A10S90 and A20S80 had significant differences in terms of wetting front process,infiltration rate and cumulative *** infiltration capacity of A was significantly higher than that of *** with linear R 2 value and model parameters,the three infiltration models were comprehensively compared,and the fitting process and results of the general empirical model for the infiltration process of homogeneous soil and layered soil showed good *** models were used to simulate the water infiltration process of layered soil with different textures,and the order of the effect is as follows:general empirical model>Kostiakov model>Philip *** type and layer thickness had a great influence on water infiltration *** sierozem was covered with aeolian sandy soil 20 cm thick,the infiltration capacity was the *** aeolian sandy soil was covered with sierozem 10 cm thic

关键词： Soil type layer thickness Water infiltration Desert steppe

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