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Segregation behaviors in{101^(-)1}compressive twin boundaries of Mg-RE alloy under deformation at room temperature

Journal of Magnesium and Alloys 2025年第1期13卷 330-337页

作者： Yujie Cui Lili Guo Yunwei Gui Kenta Aoyagi Haotian Tong Qinqin Wei Fangzhou Liu Yuichiro Hayasaka Akihiko Chiba Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Advanced Materials Processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi 980-8577Japan Department of Materials Science and Engineering Jilin University5988 Renmin StreetChangchunJilin 130025China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China The Electron Microscopy Center Tohoku UniversitySendai 980-8577Japan

Solute atoms and precipitates significantly influence the mechanical properties of Mg *** studies have mainly focused on the segregation behaviors of Mg alloys after *** this study,we investigated the segregation behaviors of an Mg-RE alloy under *** found that the enrichment of solute atoms occurred in{101^(-)1}compressive twin boundaries under compression at 298 K without any annealing in an Mg-RE alloy by scanning transmission electron microscopy and energy-dispersive X-ray *** segregated solutes and precipitates impeded the twin growth,partially contributing to the formation of small-sized{101^(-)1}compressive *** research indicates the twin boundaries can be strengthened by segregated solutes and precipitates formed under deformation at room temperature.

关键词： Magnesium alloys Compression test Scanning/transmission electron microscopy(STEM) Segregation Twin boundaries

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Preparation and Thermal Stability of AlMoON Based Solar Selective Absorption Coating

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Journal of Wuhan University of technology(materials Science) 2024年第4期39卷 854-862页

作者：闵捷 YUAN Wenxu CHEN Yufei LAN Yapeng YAN Mengdi LIU Hanze CHENG Xudong 代路 Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of TechnologyWuhan 430068China Col-laborative Innovation Center of Green Light-weight Materials and Processing Hubei University of TechnologyWuhan 430068China School of Materials and Chemical Engineering Hubei University of TechnologyWuhan 430068China School of Industrial Design Hu-bei University of TechnologyWuhan 430068China State Key Laboratory of Advanced Technology for Materials Synthesis and Process-ing Wuhan University of TechnologyWuhan 430070China Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design&Research InstituteWuhan 430205China

AlMoON based solar selective absorption coatings were deposited on stainless steel substrate by magnetron *** coatings included infrared reflection layer Mo,absorption layer AlMoN,absorption layer AlMoON and antireflection layer AlMoO from bottom to *** surface of the deposited coatings is flat without obvious *** absorptivity and emissivity are 0.896 and 0.09,respectively,and the quality factor is *** heat treatment at 500℃-36 h,the surface roughness of the coating increases,a small number of cracks and other defects appear,and the broken part is still attached to the coating surface.A certain degree of element diffusion occurs in the coatings,resulting in the decline of the optical properties of the *** absorptivity and emissivity are 0.883 and 0.131,respectively,the quality factor is 7.06,and the PC value is *** coatings do not fail under this condition and have certain thermal stability.

关键词： AlMoON coating preparation thermal stability

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Defect size evaluation in eddy current testing through wavelet transform and pseudo-color enhancement

Defect size evaluation in eddy current testing through wavel...

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2024 International Workshop on Automation, Control, and Communication Engineering, IWACCE 2024

作者： Dong, Shihao Ou, Zhengyu Xu, Cheng Cen, Jisong Han, Zandong State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China

ISBN: (数字)9781510685420

ISBN: (纸本)9781510685413

Eddy current testing (ECT) is a method used to detect defects in conductive materials. The estimation of defect sizes from detected signals plays a crucial role in evaluating product quality and guiding production processes. However, the determination of defect sizes during testing is susceptible to variations in lift-off distances, electrical noise, and often relies on human expertise. This paper evaluates defect sizes using a convolutional neural network regression model based on the impedance signals of defects. First, a through-type eddy current testing system is constructed, resembling those used in industrial production, to obtain high-quality eddy current testing data. Secondly, data are partitioned to locate defect signals, which are then converted into time-frequency matrices using continuous wavelet transform. A pseudo-colour enhancement algorithm is utilized to transform matrices into RGB images and preserve discernibility of defect information. Finally, regression models are constructed to estimate defect sizes. Experimental results demonstrate that this method can accurately evaluate defect sizes with a resolution of 0.05mm, achieving an accuracy of 96.02% with an error margin of ±0.01 mm. For defect sizes ranging from 0.3 mm to 1.0 mm, the mean absolute error in defect estimation is 3.0201×10-3 mm. © 2024 SPIE. All rights reserved.

关键词： Eddy current testing

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Quasi-Phase Equilibrium Prediction of Multi-Element Alloys Based on Machine Learning and Deep Learning

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Computers, materials & Continua 2023年第7期76卷 49-64页

作者： Changsheng Zhu Borui Zhao Naranjo Villota Jose Luis Zihao Gao Li Feng College of Computer and Communication Lanzhou University of TechnologyLanzhou730050China State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou730050China College of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050China

In this study,a phase field model is established to simulate the microstructure formation during the solidification of dendrites by taking the Al-Cu-Mg ternary alloy as an example,and machine learning and deep learning methods are combined with the Kim-Kim-Suzuki(KKS)phase field model to predict the quasi-phase *** paper first uses the least squares method to obtain the required data and then applies eight machine learning methods and five deep learning methods to train the quasi-phase equilibrium prediction *** obtaining different models,this paper compares the reliability of the established models by using the test data and uses two evaluation criteria to analyze the performance of these *** work find that the performance of the established deep learning models is generally better than that of the machine learning models,and the Multilayer Perceptron(MLP)based quasi-phase equilibrium prediction model achieves the best *** the Convolutional Neural Network(CNN)based model also achieves competitive *** experimental results show that the model proposed in this paper can predict the quasi-phase equilibrium of the KKS phase-field model accurately,which proves that it is feasible to combine machine learning and deep learning methods with phase-field model simulation.

关键词： Deep learning machine learning quasi-phase equilibrium material simulation

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Additive Manufacturing of Nickel-Based Superalloy Single Crystals with IN-738 Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 369-374页

作者： Yang Li Ye-Feng Yu Zhi-Bin Wang Xiao-Yu Liang Wen-Bin Kan Feng Lin Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaBeijing 100084China Bio-Manufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing 100084China

The production of non-weldable nickel-based superalloys,especially single-crystal superalloys,is important for additive ***-crystal specimens of non-weldable nickel-based superalloys were produced by electron beam selective melting using an IN-738 *** this study,single-crystal nickel-based superalloy specimens of diff erent sizes were prepared by a multiple preheating process and tight control of the melting parameters without the need for a grain selector or single-crystal seed for the first *** backscattered diff raction measurements were performed to confi rm the presence of a single *** transition boundaries between the polycrystalline and single-crystal regions at the edges and bottom of the samples were characterized to analyze the formation of single crystals.

关键词： Non-weldable superalloys Electron beam selective melting Single crystal Grain selection

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Engineering transcriptional regulatory networks for improving second-generation fuel ethanol production in Saccharomyces cerevisiae

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Synthetic and Systems Biotechnology 2025年第1期10卷 207-217页

作者： Dongming Sun Longhao Wu Xiaocong Lu Chenhao Li Lili Xu Hongxing Li Deyun He Aiqun Yu Tao Yu Jianzhi Zhao Hongting Tang Xiaoming Bao Key Laboratory of Biobased Material and Green Papermaking School of BioengineeringQilu University of TechnologyShandong Academy of Sciences3501 Daxue RoadJinan250353China School of Agriculture and Biotechnology Shenzhen Campus of Sun Yat-sen UniversitySun Yat-sen UniversityShenzhen518107GuangdongChina Center for Synthetic Biochemistry Shenzhen Institute of Synthetic BiologyShenzhen Institutes for Advanced TechnologyChinese Academy of SciencesShenzhen518055China State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial Fermentation Microbiology of the Ministry of EducationTianjin Key Laboratory of Industrial MicrobiologyCollege of BiotechnologyTianjin University of Science and TechnologyTianjin300457China

Presently,Saccharomyces cerevisiae demonstrates proficient co-fermentation of glucose and xylose,marking a significant advancement in second-generation fuel ethanol ***,the presence of high concen-trations of inhibitors in industrial lignocellulose hydrolysates and post-glucose effect caused by glucose con-sumption hinders severely impedes yeast robustness and xylose utilization for ethanol *** worse,the antagonism between xylose utilization ability and strain robustness was observed,which proposes a difficult challenge in the production of second-generation fuel ethanol by *** review introduces the effect of engineering transcriptional regulatory networks on enhancing xylose utilization,improving strain robustness,alleviating antagonism between xylose utilization and strain robustness,and reducing post-glucose ***,we provide an outlook on the developmental trends in this field,offering insights into future di-rections for increasing the production of second-generation fuel ethanol in ***.

关键词： Saccharomyces cerevisiae Second-generation fuel ethanol Strain robustness Xylose utilization Antagonism Post-glucose effect

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Disrupting variant selection memory effect in laser powder bed fusion to improve strength-ductility synergy of Ti-6Al-4V alloys

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Journal of materials Science and technology 2025年 219卷 19-32页

作者： Yang, C. Liu, B. Pan, L.L. Yang, Y. Zhou, Y. Cai, W.S. Liu, Le-hua National Engineering Research Center of Near-net-shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials South China University of Technology Guangzhou 510640 China Shenzhen Leadwell Technology Co. Ltd. Shenzhen Guangdong 518000 China

Texture formation is frequently observed in parts produced by Laser Powder Bed Fusion (L-PBF), which can induce anisotropy and may potentially degrade plasticity. In this study, we introduce a laser remelting strategy to mitigate these adverse effects. By employing experimental observations and numerical simulations, we established the relationship between melt pool thermal history, variant selection, and mechanical properties. Our results indicate that the strengthening of texture can be prevented by disrupting the variant selection memory effect when there is a difference in scanning speeds between the printing and remelting lasers. The achieved random variant orientation is attributed to the altered cooling rates and temperature gradient directions during solidification across different layers. The optimized Ti-6Al-4V alloy demonstrates high strength (1211.5 ± 13.3 MPa) and significant elongation (12.3 % ± 0.8 %), exhibiting a superior strength-ductility synergy compared to samples produced by direct printing or laser remelting with consistent parameters, as well as most reported L-PBF processed Ti-6Al-4V alloys. Our findings provide new insights into phase transformation kinetics in L-PBF of Ti-6Al-4V alloys and facilitate the optimization of this process for manufacturing high-performance components. © 2024

关键词： Titanium alloys

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Asymmetric wettability channel of membranes for water and oil concurrent recovery from emulsions

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Science China materials 2025年

作者： Lu Tie Xiaoping Zheng Department of Applied Physics School of Science Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and Engineering Lanzhou University of Technology

Oily wastewater is a global water pollutant, while trace water in transportation fuels/lubricants threatens vehicle safety. advanced oil-water separation technologies are crucial for mitigating water pollution and upgrading oil purity. Conventional separation methods like centrifugation(density-dependent [1]) and flocculation(chemical additives, secondary pollution [2]) have limitations, whereas membrane filtration is widely used in the oil-water separation [3,4].

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Mesoscale deformation mechanisms in relation with slip and grain boundary sliding in TA15 titanium alloy during tensile deformation

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Journal of materials Science & technology 2022年第3期98卷 72-86页

作者： Yanxi Li Pengfei Gao Jingyue Yu Shuo Jin Shuqun Chen Mei Zhan State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Advanced Functional Materials Education Ministry of ChinaSchool of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Revealing the mesoscale deformation mechanisms of titanium alloy with tri-modal microstructure is of great significance to improve its mechanical properties. In this work, the collective behavior and mechanisms of slip activities, slip transfer, and grain boundary sliding of tri-modal microstructure were investigated by the combination of quasi-in-situ tensile test, SEM, EBSD and quantitative slip trace analyses. It is found that the slip behavior presents different characteristics in the equiaxed α(α_(p)) and lamellar α(α_(l))grains. Under a low level of deformation, almost all the slip deformation is governed by single basal and prismatic slips for both of α_(p)and α_(l),despite small amount of < a >-pyramidal slip exists in α_(l)grains. As deformation proceeds, < a >-pyramidal and < c + a >-pyramidal slip systems with high Schmid factors were activated in quantities. Specially, certain coarse prismatic slip bands were produced across both of single and colony α_(l)grains whose major axes tilting about 40 °–70 ° from the tensile axis. Slip transfer occurs at the boundaries of α_(p)/α_(p)and α_(l)/β under the condition that there exists perfect alignment between two slip systems and high Schmid factors of outgoing slip system. The slip transfer across α_(l)/β boundary can be divided into two types: straight slip transfer and deflect slip transfer with a deviation angle of 5 °–12 °, depending on the alignment of slip planes of two slip systems. The grain boundary sliding along boundaries of α_(l)/β and α_(p)/β was captured by covering micro-grid on tensile sample. It is found that the crystallographic orientation and the geometrical orientation related to loading axis play great roles in the occurrence of grain boundary sliding.

关键词： Titanium alloy Tri-modal microstructure Slip modes Slip transfer Grain boundary sliding

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Simulation of macrosegregation in a 36-t steel ingot using a multiphase model

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International Journal of Minerals,Metallurgy and materials 2020年第2期27卷 200-209页

作者： Zhuo Chen Hou-fa Shen Key Laboratory for Advanced Material Processing Technology Ministry of Education School of Material Science and Engineering Tsinghua University

Macrosegregation is the major defect in large steel ingots caused by solute partitioning and melt convection during *** this study,a three-phase(liquid,columnar dendrites,and equiaxed grains)model is proposed to simulate macrosegregation in a 36-t steel ingot.A supplementary set of conservation equations are employed in the model such that two types of equiaxed grains,either settling or adhering to the solid shell,are well *** predicted concentration agrees quantitatively with the experimental value.A negative segregation cone was located at the bottom owing to the grain settlement and solute-enriched melt leaving from the mushy *** interdendritic liquid flow was carefully analyzed,and the formation of A-type segregations in the mid-height of the ingot is *** segregation was observed near the riser neck due to the specific relationship between flow direction and temperature ***,the as-cast macrostructure of the ingot is presented,including the grain size distribution and columnar–equiaxed transition.

关键词： macrosegregation multiphase model transportation solidification steel ingot

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