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Large field of view computed laminography with the asymmetric rotational scanning geometry

Science china(Technological Sciences) 2010年第8期53卷 2261-2271页

作者： fu jian 1,2.,{2.,{2.,Beijing 100191,china 2.Research Center of Digital Radiation Imaging and Biomedical Imaging,{2.,Beijing 100191,china 1. school of mechanical {{2. and automation Beihang University Beijing 100191 China2. Research Center of Digital Radiation Imaging and Biomedical Imaging Beihang University Beijing 100191 China

X-ray computed laminography(CL)is used in the fields of industrial inspection and medical *** can provide the internal structure three-dimensional(3D)information of a region of the objects *** is important to the clinical diagnosis and the quality control of flat objects like printed circuit boards,aircraft wings and satellite solar *** the restriction that the imaging region must be within the X-ray beam formed by the X-ray source and the detector,the imaging field of view of CL is limited by the size of detector.A new CL method with an asymmetric rotational cone-beam scanning geometry,called large field of view CL,is presented to overcome the existing *** can extend the imaging region when the imaging spatial resolution keeps the same as that of the conventional *** can also improve the imaging spatial resolution when the imaging region keeps the same as that of the conventional *** asymmetric configuration can be achieved by offsetting the detector from the conventional symmetric *** does not,however,require new detectors and X-ray source nor alter the scanning mechanical *** filtered back-projection(FBP)reconstruction algorithm and the data truncation smoothing {2.nctions have been deduced to reconstruct the images directly from the data acquired with this asymmetric *** performed numerical studies and experiments to demonstrate and validate the proposed approach. Results in these studies and experiments confirm that the proposed method can enlarge the imaging region and improve the spatial *** proposed approach may find applications in the CL system with the rotational scanning geometry.

关键词： computed laminography image reconstruction reconstruction algorithm imaging field of view imaging spatial resolution

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{1012.twin–twin intersection-induced lattice rotation and dynamic recrystallization in Mg–6Al–3Sn–2.n alloy

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Journal of Magnesium and Alloys 2024年第4期12卷 1529-1539页

作者： bin-jiang Lv Sen Wang {2.-Hao Gao Ning Cui Yi-Nan li Tie-Wei Xu Feng Guo school of mechanical and Automotive {{2. Qingdao University of Technology266520China Key Lab of industrial Fluid Energy Conservation and Pollution Control Qingdao University of Technology266520China

This study investigated the formation mechanism of new grains due to twin–twin intersections in a coarse-grained Mg–6Al–3Sn–2.n alloy during different strain rates of an isothermal *** results of electron backscattered diffraction investigations showed that the activated twins were primarily{1012.tension twins,and 60°1010>boundaries formed due to twin–twin intersections under different strain *** twin variants with 60°1010>boundaries transformed into new grains through lattice rotations at a low strain rate(0.01 s^(−1)).At a high strain rate(10 s^(−1)),the regions surrounded by subgrain boundaries through high-dens{2. dislocation arrangement and the 60°1010>boundaries transformed into new grains via dynamic recrystallization.

关键词： Mg alloy Twin-twin intersection Lattice rotation Dynamic recrystallization

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Ultrasonic vibration enabled under-liquid forming of metallic glasses

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Science Bulletin 2024年第2期69卷 163-166页

作者： Xin li Luyao li Sajad Sohrabi Jia'nan fu Zhen li Zhe Chen Rongce Sun Yu Zhang Jinbiao Huang Heting Zhang jian Zhu Xiangyan Chen Kaikai Song {2. Ma school of mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China State Key Laboratory of Radio Frequency Heterogeneous Integration College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Department of Mechanics and Aerospace engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Research Institute of Shandong univer.ity Shenzhen 518057China

Advancements in forming technology offer significant advantages for the manufacturing industry,including enhanced efficiency,energy conservation,and improved material utilization[1].However,traditional additive manufacturing[2.,thermoplastic forming[3],and laser cutting[4]encounter challenges when applied in under-liquid environments,mainly due to difficulties in temperature control and heat source provision.

关键词： glasses liquid metallic

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Grain refinement of Mg-li-Al cast alloys by adding typical master alloys

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Progress in Natural Science:Materials International 2011年第3期21卷 236-239页

作者： bin jiang~(1,{2.,Qing-shan YANG~{2.Ming-xing ZHANG~3,Dong QIU~3,Rui-hong li~{2.fu-sheng PAN~(1,{2. 1.National {{2. Research Center for Magnesium Alloys,Chongqing univer.ity,Chongqing 400044,china {2.College of Materials Science and {{2.,Chongqing univer.ity,Chongqing 400044,china 3.Division of Materials,school of mechanical and Mining {{2., The univer.ity of Queensland,St Lucia,QLD 407{2.Australia [a] National engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China [b] College of Materials Science and engineering Chongqing University Chongqing 400044 China [c] Division of Materials School of Mechanical and Mining Engineering The University of Queensland St Lucia QLD 4072 Australia

Commercial Al-3Ti-1C and Al-5Ti-1B master alloys were added in order to refine the grains of Mg-li-Al *** effects of their addition levels on grain refinement of Mg-li-Al cast alloy were investigated and the mechanism of the grain refinement was *** results showed that the addition of Al-3Ti-1C master alloy reduced the grain size of LA141 cast alloy from 900μm to 400μm,while the addition of Al-5Ti-1B master alloy reduced the grain size of LA51 cast alloy from 500μm to 2.0μ*** grain refining mechanism was the heterogeneity nucleation of TiC and TiB2.because of less than 10%mismatches of TiC/β-li and TiB2.α-Mg.

关键词： magnesium lithium alloy master alloy grain refinement

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纤维排布对CFRP感应加热固化成型过程影响表征

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北京航空航天大学学报 2024年第1期50卷 198-207页

作者：付天宇杨宁古云飞许家忠蒋悦李斌常州信息职业技术学院智能装备学院常州213164 山西大同大学计算机与网络工程学院大同037009 哈尔滨理工大学机械动力工程学院哈尔滨150080 哈尔滨理工大学自动化学院哈尔滨150080 重庆市特种设备检测研究院重庆401120

在采用电磁感应加热方式实现碳纤维复合材料(CFRP)加热固化成型的过程中,如何准确表征材料各组成部分的属性参数状态对研究材料加热过程中温度、固化度及应力场分布至关重要。根据纤维实际铺层方式对材料各组成部分进行独立表征,以及碳... 详细信息

在采用电磁感应加热方式实现碳纤维复合材料(CFRP)加热固化成型的过程中,如何准确表征材料各组成部分的属性参数状态对研究材料加热过程中温度、固化度及应力场分布至关重要。根据纤维实际铺层方式对材料各组成部分进行独立表征,以及碳纤维壳体的等效电-磁-热特性建立了CFRP感应加热有限元细观分析模型,将纤维织构和树脂基体单独建立,实现CFRP在感应加热过程中其内部纤维织构中物理场的变化规律以及对材料整体升温变化规律进行系统分析。通过该模型计算了材料温度、固化度及应力场分布的变化规律,揭示了碳纤维排布对材料感应加热效果的影响,并根据感应加热实验验证了该模型可以准确表征各物理场的分布状态。为研究CFRP在感应加热中各物理场变化规律提供了有效的计算模型和分析方法。

关键词：碳纤维感应加热温度场固化度应力场

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Effect of feeding parameters on ingot segregation and shrinkage pore in vacuum arc remelting

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Journal of Iron and Steel Research International 2023年第6期30卷 1268-1278页

作者： Dong-bin jiang {2.-zhong Yang {2. Zhang Yang Zhou li-feng Zhang school of Metallurgy and Ecological engineering University of Science and Technology BeijingBeijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Chengdu 610303SichuanChina school of mechanical and Materials {{2. North China University of TechnologyBeijing 100144China

The feeding parameters in the final stage of vacuum arc remelting process obviously affect the solute segregation and shrinkage pore *** with the electromagnetic field,fluid flow,and solute transport,a numerical model was built to investigate the effect of feeding parameters on the ingot solidification *** Nb segregation and shrinkage pore depth in the solidified ingot were *** results show that the liquid moves along the solidification front and the vertex flow is formed in the liquid pool,which promotes solute *** the solidified ingot,the Nb segregation in the lower part is negative,while that in the upper part is *** the differential electrode applied,the positive segregation is slightly reduced but the segregation distribution remains *** the feeding current decreases,the positive segregation zone moves toward the ingot top surface,due to the final solidification position moving *** the feeding time extended,the positive segregation moves to the top surface and the shrinkage pore depth is *** the feeding time is set at 12.min,the shrinkage pore depth can be reduced to 2. mm.

关键词： Vacuum arc remelting Feeding parameter Macrosegregation Shrinkage pore Solidification

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Searching for^(76)Ge neutrinoless double beta decay with the CDEX-1B experiment

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Chinese Physics C 2024年第10期48卷 11-22页

作者： bing-Tao Zhang Jun-Zheng Wang li-Tao Yang Qian Yue Ke-Jun Kang Yuan-Jing li Hai-Peng An C.Greeshma jian-Ping Chang Yun-Huan Chen jian-Ping Cheng Wen-Han Dai Zhi Deng Chang-Hao Fang Xin-Ping Geng Hui Gong Qiu-Ju Guo Xu-Yuan Guo li He Sheng-Ming He Jin-Wei Hu Han-Xiong Huang Tu-Chen Huang Hai-Tao Jia Xi jiang S.Karmakar Hao-bin li jian-Min li Jin li Qian-Yun li Ren-Ming-Jie li Xue-Qian li Yu-Lan li Yi-Fan liang bin liao Fong-Kay lin Shin-Ted lin Jia-Xuan liu Shu-Kui liu Yan-Dong liu Yu liu Yuan-Yuan liu Zhong-Zhi liu Hao Ma Yu-Cai Mao Qi-Yuan Nie Jin-Hua Ning Hui Pan Ning-Chun Qi Jie Ren Xi-Chao Ruan Ze She Manoj Kumar Singh Tian-Xi Sun Chang-jian Tang Wei-You Tang Yang Tian Guang-fu Wang li Wang Qing Wang Yu-Feng Wang Yun-Xiang Wang Henry-Tsz-King Wong Shi-Yong Wu Yu-Cheng Wu Hao-Yang Xing Rui Xu Yin Xu Tao Xue Yu-Lu Yan Nan Yi Chun-Xu Yu Hai-Jun Yu jian-Feng Yue Ming Zeng Zhi Zeng Feng-Shou Zhang Lei Zhang Zhen-Hua Zhang Zhen-Yu Zhang Kang-Kang Zhao Ming-Gang Zhao Ji-Fang Zhou Zu-Ying Zhou Jing-Jun Zhou Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of engineering Physics Tsinghua UniversityBeijing 100084 Department of Physics Tsinghua UniversityBeijing 100084 Institute of Physics Academia SinicaTaipei 11529 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875 College of Physics Sichuan UniversityChengdu 610065 school of Physics Peking UniversityBeijing 100871 Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413 Sino-French Institute of Nuclear and Technology Sun Yat-sen UniversityZhuhai 519082 school of Physics Nankai UniversityTianjin 300071 Department of Physics Banaras Hindu UniversityVaranasi 221005 Department of Physics Beijing Normal UniversityBeijing 100875

We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the china Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of^(76)Ge.A total of 504.3 kg⋅day effective exposure data was *** anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–{2.89 keV for this work)with a factor of {2..A background level of 0.33 counts/(keV⋅kg⋅yr)was *** lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1/{2.^(0ν)>1.0×10^({2.)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:2.7.5 eV.

关键词： neutrinoless double beta decay CDEX point-contact germanium detector ^(76)Ge

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Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Wen Huang fu-Jie Yu Qi Zhao Xin-Dong Zhu Tao Feng Yao jiang Xiao-Ming li Xue-Fei Miao He Zhu Si Lan Xue-Qian Wang Bao-Long Shen Zhe Jia Feng-Qi Zhang Wei Wang Qi liu Yang Ren Xun-li Wang Xiao-Ya Cui Xiao-Yang Wang Ya-Nan Chen {2.g-{2.g Fan Meng-Ru li Qi-Long Gao Jia-Ming Guo Zeng-Bao Jiao Zhi-Min Guo Yu-Ping Zhao Qian Yu Rui Huang ling-Kun Zhang Yi-Ping Lu Xu-Bo li Huai-Jun lin Yan Ma Wei-Ming Yang Zhi-Hua Shen Hai-Yan He Yong-Gang Sun Yong-jiang Huang De-Zhuang Wang Qing-Feng liu Fei-Yang Wang Hui liu Hong-Hui Wu li-Qiang Wang Yang Lu Nan Wang Tian-li Wang Wei-{2.g liao Yi-Han Wang Yuan Wu Yu-Zhen Yin Jie Pan Yi Zhang Qing Wang jian-Yang Zhang Tao Yang Yasir Sohail Jin-Yu Zhang Hua Ji Qiang li Wei-Di liu Zhi-Gang Chen Xiong-Jun liu Wen Ma liang Mao Zhen-Duo Wu school of Materials Science and engineering Nanjing University of Science and Technology jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and Engineering Southeast University Department of Physics City University of Hong Kong school of Materials Science and engineering Tianjin University school of Physics and Microelectronics Zhengzhou University Department of mechanical engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Key Laboratory of Solidification Control and Digital Preparation Technology (liaoning Province) School of Materials Science and Engineering Dalian University of Technology Institute of Advanced Wear & Corrosion Resistance and functional Materials Jinan University school of Mechanics and Civil engineering China University of Mining and Technology school of Physical Sciences Great Bay University school of Materials Science andengineering Harbin Institute of Technology State Key Laboratory of Materials-Oriented Chemical engineering College of Chemical Engineering Nanjing Tech University Beijing Advanced Innovation Center for Materials Genome engineering Research Institute for Carbon Neutrality University of Science and Technology Beijing Department of mechanical engineering The University of Hong Kong school of Computing Macquarie University Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Institute of materials Shanghai University Department of Materials Science and engineering C

Owing to their exceptional properties, high-entropy alloys(HEAs) and high-entropy materials have emerged as promising research areas and shown diverse applications. Here,the recent advances in the field are comprehensively reviewed,organized into five sections. The first section introduces the background of HEAs, covering their definition, significance,application prospects, basic properties, design principles, and microstructure. The subsequent section focuses on cutting-edge high-entropy structural materials, highlighting developments such as nanostructured alloys, grain boundary engineering,eutectic systems, cryogenic alloys, thin films, micro-nano-lattice structures, additive manufacturing, high entropy metallic glasses, nano-precipitate strengthened alloys, composition modulation, alloy fibers, and refractory systems. In the following section, the emphasis shifts to functional materials, exploring HEAs as catalysts, magneto-caloric materials, corrosion-resistant alloys, radiation-resistant alloys, hydrogen storage systems, and materials for biomedicine. Additionally, the review encompasses functional high-entropy materials outside the realm of alloys, including thermoelectric, quantum dots, nanooxide catalysts, energy storage materials, negative thermal expansion ceramics,and high-entropy wave absorption materials. The paper concludes with an outlook, discussing future directions and potential growth areas in the field. Through this comprehensive review,researchers, engineers, and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： Cutting-edge structural materials Cutting-edgefunctional materials High entropy alloys

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基于改进的MOGWO高强度钢辊弯成形工艺的多目标优化

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塑性工程学报 2024年第7期31卷 89-99页

作者：赵彬荐李兆军蒋春玲刘忆恒黄伟广西大学机械工程学院广西南宁530000 中国重汽集团柳州运力专用汽车有限公司广西柳州545000 广西科技大学机械与汽车工程学院广西柳州545000

为了探究成形参数对高强度钢辊弯件成形质量的影响,并对工艺参数进行优化,提出了一种辊弯成形工艺优化方法。首先,应用LS-DYNA有限元软件模拟LG700高强度钢U型辊弯件的成形过程。然后,通过Box-Behnken响应面设计对高强度钢U型辊弯件进... 详细信息

为了探究成形参数对高强度钢辊弯件成形质量的影响,并对工艺参数进行优化,提出了一种辊弯成形工艺优化方法。首先,应用LS-DYNA有限元软件模拟LG700高强度钢U型辊弯件的成形过程。然后,通过Box-Behnken响应面设计对高强度钢U型辊弯件进行仿真试验,分析辊弯道次、过弯角、辊站间距和辊缝间距等成形工艺参数以及厚度、法兰高度、圆角半径等几何参数对辊弯件偏差角和纵弓高度的影响,并通过拟合得到偏差角和纵弓高度二者的二阶响应模型。最后,采用改进的多目标灰狼优化(MOGWO)算法对特定尺寸辊弯件进行工艺优化,并通过实例进行验证。结果表明,将优化后的工艺参数用于高强度钢辊弯成形过程中导致其偏差角由0.78°降至0.2.°,纵弓高度由1.58 mm降至1.2. mm,成形质量得到提高,满足相关产品的装配精度要求。

关键词：辊弯成形 LS-DYNA 高强度钢响应面法多目标灰狼优化算法

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Interface Analysis and Hot Deformation Behaviour of a Novel Laminated Composite with High-Cr Cast Iron and Low Carbon Steel Prepared by Hot Compression Bonding

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Journal of Iron and Steel Research International 2015年第5期22卷 438-445页

作者： Zheng-yi jiang Xing-jian GAO Sheng-li li Hong-mei ZHANG Deng-{2. CHEN jian-zhong XU school of Materials and Metallurgy University of Science and Technology Liaoning school of mechanical Materials and Mechatronic EngineeringUniversity of Wollongong College of Materials Science and engineering Chongqing University State Key Laboratory of Rolling and automation Northeastern University

A hot compression bonding process was developed to prepare a novel laminated composite consisting of high-Cr cast iron （HCCI） as the inner layer and low carbon steel （LCS） as the outer layers on a Gleeble 3500 ther- momechanicat simulator at a temperature of 950 ℃ and a strain rate of 0. 001 s 1. Interfacial bond quality and hot deformation behaviour of the laminate were studied by mierostructural characterisation and mechanical tests. Experi- mental results show that the metallurgical bond between the constituent metals was achieved under the proposed bonding conditions without discernible defects and the formation of interlayer or intermetallic layer along the inter- face. The interfacial bond quality is excellent since no deterioration occurred around the interface which was deformed by Vickers indentation and compression test at room temperature with parallel loading to the interface. After well cladding by the LCS, the brittle HCCI can be severely deformed （about 57 % of reduction） at high temperature with crack-free. This significant improvement should be attributed to the decrease of crack sensitivity due to stress relief by soft claddings and enhanced flow property of the HCCI by simultaneous deformation with the LCS.

关键词： bonding laminated metal composite interface structure hot working high-Cr cast iron

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