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High-temperature deformation behavior of titanium clad steel plate

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Rare Metals 2015年第11期34卷 764-769页

作者： Shang-Wu Zeng Ai-Min Zhao Hai-Tao Jiang Xiao-Qian Yan Ji-Xiong Liu Xiao-Ge Duan Engineering Research Institute University of Science and Technology Beijing Beijing Laboratory of Metallic Materials and Processing for Modern Transportation baoti Research Institute Baoti Group Co. Ltd.

In this paper, the single-pass hot compression experiment of titanium clad steel plate was carried out by Gleeble-3500 thermal mechanics simulation test machine,and the effect of deformation temperature(T), strain rate(ε),thickness ratio(k), and friction coefficient(l) on flow pattern of the metal and stress in the deformation zone was *** results show that the metal flow behavior and the stress during compressive deformation depend strongly on the deformation temperature. At 800 and 850 °C, the bimetal can flow uniformly, while at 900 °C, the TA2 flows faster than Q235 B, and the phenomenon of TA2 wrapping Q235 B is observed. The metal flow of the bimetal material will coordinate each other through the bonding interface. It is noted that the stress increases with the increase of the ε and l and decreases when the metal flows along the contact area.

关键词： Titanium clad steel plate Hot deformation simulati

SensFL:Privacy-Preserving Vertical Federated Learning with Sensitive Regularization

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 385-404页

作者： Chongzhen Zhang Zhichen Liu Xiangrui Xu Fuqiang Hu Jiao Dai Baigen Cai Wei Wang School of Automation and Intelligence Beijing Jiaotong UniversityBeijing100044China Shuohuang Railway Development Co. Ltd.National Energy GroupCangzhou062350China Beijing Key Laboratory of Security and Privacy in Intelligent Transportation School of Computer Science and TechnologyBeijing Jiaotong UniversityBeijing100044China

In the realm of Intelligent Railway Transportation Systems,effective multi-party collaboration is crucial due to concerns over privacy and data *** Federated Learning(VFL)has emerged as a promising approach to facilitate such collaboration,allowing diverse entities to collectively enhance machine learning models without the need to share sensitive training ***,existing works have highlighted VFL’s susceptibility to privacy inference attacks,where an honest but curious server could potentially reconstruct a client’s raw data from embeddings uploaded by the *** vulnerability poses a significant threat to VFL-based intelligent railway transportation *** this paper,we introduce SensFL,a novel privacy-enhancing method to against privacy inference attacks in ***,SensFL integrates regularization of the sensitivity of embeddings to the original data into the model training process,effectively limiting the information contained in shared *** reducing the sensitivity of embeddings to the original data,SensFL can effectively resist reverse privacy attacks and prevent the reconstruction of the original data from the *** experiments were conducted on four distinct datasets and three different models to demonstrate the efficacy of *** results show that SensFL can effectively mitigate privacy inference attacks while maintaining the accuracy of the primary learning *** results underscore SensFL’s potential to advance privacy protection technologies within VFL-based intelligent railway systems,addressing critical security concerns in collaborative learning environments.

关键词： Vertical federated learning privacy defenses

Phase precipitation behavior and tensile property of a Ti-Al-Sn-Zr-Mo-Nb-W-Si titanium alloy

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Rare Metals 2018年第12期37卷 1064-1069页

作者： Wen-Jing Zhang Xiao-Yun Song Song-Xiao Hui Wen-Jun Ye Wei-Qi Wang State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals School of Materials and Metallurgy Northeastern University baoti group Co. Ltd.

The characteristic of precipitation behavior of a2 phase and silicide, and the tensile properties at room temperature and 650℃after heat treatments in anovel TiAl-Sn-Zr-Mo-Nb-W-Si titanium alloy（BTi-6431 S） were investigated by microstructure analysis and mechanics performance testing. The results show that no second phase precipitates after solution treatment(980 ℃/2 h, air cooling（AC）). However, when the solution-treated specimens are aged at 600 ℃（600 ℃/2 h,AC）,α;phase precipitates in the primary α phase, and the size of α;phase increases with the aging temperature increasing to 750 ℃. Meanwhile, 50-100-nm S2-type silicide particles precipitate along lamellar phase boundaries of transformed β phase after aging at 750 ℃. BTi-6431 S alloy shows the best650 ℃ ultimate tensile strength（UTS） and yield strength（YS） when treated in solution treatment. However, aging treatment results in a decline in 650 ℃ ultimate tensile strength. This may be attributed to the loss of solution strengthening due to the depletion of Al, Si and Zr of the matrix caused by the precipitation of Ti;Al and（TiZr）;Si;.Silicide is a brittle phase; therefore, its precipitation causes a sharp decrease in the room-temperature ductility of BTi-6431 S alloy.

关键词： High-temperature titanium alloy Precipitation behavior α_2 phase Silicide Tensile properties

Substructure evolution in two phases based constitutive model for hot deformation of TC18 inα+βphase region

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Chinese Journal of Aeronautics 2023年第4期36卷 573-588页

作者： Lian LI Jixiong LIU Ning DING Miaoquan LI School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’anShaanxi 710072China baoti group Co. LtdXi’an 721014China

Theα+βdual phase titanium alloys are key structural materials in aviation and aero-space industries,and the complicated flow behavior of these titanium alloys during hot deformation requires to establish a constitutive model incorporating physical mechanism for optimizing process-ing parameters and designing forming *** work aims to establish a constitutive model incor-porating physical mechanism for hot deformation of TC18 inα+βphase ***,the flow behavior and microstructure evolution for hot deformation of TC18 inα+βphase region are *** TC18 shows significant strain hardening rate and negative strain hardening exponent around and after peak flow stress,*** peak flow stress,Dynamic Recovery(DRV)mechanism dominates the evolution of a and b phases according to the results of substructure ***,the internal state variables method is applied to establish a constitutive model incor-porating physical mechanism for hot deformation of dual phase titanium *** variation of dislocation density during the hot deformation of titanium alloys is modeled by considering the accumulation of dislocation due to the impediment to dislocation movement by substructure obsta-cles and the annihilation of dislocation due to the dynamic restoration *** interaction between dislocations,the subgrain boundaries and the grain/phase boundaries obstruct the disloca-tion movement in the a phase,and the first two obstructs the dislocation movement in the b phase during the hot deformation of *** dislocation annihilation process in theαandβphases dur-ing the hot deformation of TC18 is dominated by ***,the substructure evolution in the two phases based constitutive model for hot deformation of TC18 inα+βphase region is *** model is well applied to predict the flow stress and quantitively analyze the role of DRV effect in the evolution ofαandβphases during the hot deformation of TC18.

关键词： Constitutive model Dynamic recovery Hot deformation Substructure TC18

PREPARATION OF MDPE-g-MAH COPOLYMERS AND THEIR EFFECT ON PROPERTIES OF MDPE/CaCO_3 SYSTEMS

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Chinese Journal of Polymer Science 2013年第9期31卷 1271-1275页

作者： Guo-dong Zhao Xiao-bo Liu Guang-nan Qiu Jian-ming Xu Shi-ping Xie Xian-feng Liu Jian-song Yang Lan-hang Xu Changyuan Electronics Co. Ltd. Changyuan group Co. Ltd.

MDPE-g-MAH copolymers were prepared with MDPE （medium density polyethylene） and MAH （maleic anhydride） under different irradiation doses of high-energy electron accelerator, and FTIR spectra confirmed their structure. The effect of the different contents of MDPE-g-MAH copolymers on properties of MDPE/CaCO3 system is studied intensively. By adding 4 Phr （parts per hundred of resin） MDPE-g-MAH in MDPE/CaCO3 system under irradiation dose of 0.7 MGy, the tensile strength increases from 16.3 MPa to 19.9 MPa, and elongation at break increases from 437% to 518%. SEM images show the domain size of CaCO3 in MDPE-g-MAH systems becomes small. Definitely, MDPE-g-MAH copolymer could improve the compatibility of MDPE/CaCO3 system effectively.

关键词： MDPE-g-MAH copolymer MDPE CaCO3, Irradiation modification Compatibility.

Effect ofαphase on fatigue crack growth of Ti-6242 alloy

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Journal of Iron and Steel Research International 2017年第8期24卷 811-822页

作者： Hang-wei Zhou Hui-qun Liu Dan-qing Yi Yu Xiao Xiao-long Zhao Jian Wang Qi Gao School of Materials Science and Engineering Central South UniversityChangsha 410088HunanChina Key Laboratory of Nonferrous Materials Ministry of EducationCentral South UniversityChangsha 410083HunanChina baoti group ltd. Baoji 721014ShanxiChina

Fatigue crack growth as a function ofαphase volume fraction in Ti-6Al-2Sn-4Zr-2Mo（Ti-6242）alloy was investigated using fatigue testing,optical microscopy,scanning electron microscopy,and transmission electron ***α＋βannealing treatments with different solid solution temperatures and cooling rates were conducted in order to tailor microstructure with differentαphase features in the Ti-6242 alloy,and fatigue crack growth mechanism was discussed after detailed microstructure *** results showed that fatigue crack growth rate of Ti-6242 alloy decreased with the decrease in volume fraction of the primaryαphase（αp）.Samples with a large-sizedαgrain microstructure treated at high solid solution temperature and slow cooling rate have lower fatigue crack growth *** appearance of secondaryαphase（αs）with the increase of solid solution temperature led to crack ***,a fatigue crack growth transition phenomenon was observed in the Paris regime of Ti-6242 alloy with 29.8% αp（typical bi-modal microstructure）and large-sizedαgrain microstructure,owing to the change of fatigue crack growth mechanism.

关键词： Ti-6242 alloy Microstructure tailoring Fatigue crack growth α phase Fatigue crack growth rate Crack propagation transition

Microstructure/texture evolution maps to optimize hot deformation process of near-α titanium alloy

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Progress in Natural Science:Materials International 2020年第1期30卷 86-93页

作者： Zhixin Zhang Jiangkun Fan Bin Tang Hongchao Kou Jian Wang Zhiyong Chen Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University baoti group ltd. National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Institute of Metal Research Chinese Academy of Sciences

The microstructure/texture evolution(MTE,for short) map and processing map of a new near a titanium alloy Ti65 were constructed in order to investigate the workability and microstructure evolution of hot *** processing map illustrated four domains,two summit domains and two instability *** morphologies of the a phase changed from the spheroidization(α+β region) to the deformed and elongated β grains(near the βtransus temperature Tβ),and then to the obvious dynamic recrystallization(DRX)(β region) with the temperature rising from 930 ℃ to 1140℃.Deformation in the α+β field mainly generated the texture component with [0001]or [0223] parallel to radial directions(RDs).While deformation in the β phase field formed two types of texture component with [0001] parallel to RDs and [2110] parallel to compression *** optimized processing map was summarized by overlaying the macro-instability map on the original processing map,and the instability domain of Ti65 alloy was confirmed in the area with the strain rate higher than 0.01 s-1.

关键词： Titanium alloy Hot deformation Deformation mechanism Microstructure evolution Texture

Process optimization of neodymium chloride solutions precipitated by magnesium bicarbonate

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Journal of Rare Earths 2019年第4期37卷 437-442页

作者： Yannan Yan Yang Xu Xiaowei Huang Zongyu Feng Yongke Hou Kai Li Liangshi Wang Yihanna Hu National Engineering Research Center for Rare Earth Materials GRINM Group Co. Ltd. Grirem Advanced Materials Co. Ltd. GRINM Group Co. Ltd. China United Test & Certification Co. Ltd.

Rare earths(REs) are of vital importance for the development of new materials and green *** bicarbonate is one of the most recyclable and environmental-friendly precipitant for REs recovery from leaching solutions. Nd_2(CO_3)_3 has difficulties in industrial production. So in this study,the precipitation of neodymium from chloride solution by magnesium bicarbonate are investigated. The effects of feeding method, [HCO_3^-]/[Nd^(3+)] mole ratio, feeding speed and reaction temperature on yield and impurity(magnesia) content are systematically studied. Results show that the impurity(magnesia)content decreases to 0.010 wt% with a yield approaching to 100% obtained under the conditions of[HCO_3^-]/[Nd^(3+)] = 3.00 by parallel flow addition at 50 ℃. The major impurity(magnesia) in rare earth carbonates mainly presents in the form of physical absorption, which can be easily removed by scrubbing. Therefore, it offers a promising green process that uses magnesium bicarbonate to produce neodymium carbonate due to its cycling of carbon dioxide, magnesium salt and waste water.

关键词： Rare earth Magnesium bicarbonate Precipitation process Yield

Highly efficient quantum dot light-emitting diodes with the utilization of an organic emission layer

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Nano Research 2023年第7期16卷 10545-10551页

作者： Yang Li Dejiang Zhao Wei Huang Zhiqiang Jiao Lu Wang Qingyu Huang Peng Wang Mengna Sun Guangcai Yuan BOE Technology group. Ltd.Beijing 100176China

The relative balance of electron and hole injection is crucial for the achievement of highly efficient quantum dot(QD)lightemitting diodes(QLEDs).Here,an inverted red QLED with the utilization of an organic emitting layer(EML)was obtained,exhibiting peak current efficiency(CE)and external quantum efficiency(EQE)of 25.63 cd/A and 23.20%,*** the proposed device,the organic EML,which is a blend of fac-tris(2-phenylpyridine)iridium(Ir(ppy)_(3))and 4,4’-bis(N-carbazolyl)-1,1’-biphenyl(CBP),works as an exciton harvester to capture the leaked electrons from QD layer and the injected holes from hole transporting layer(HTL),then affording energy transfer from organic EML to the adjacent QD layer so that the emission of QD is enhanced *** the same time,according to the results of hole-only and electron-only devices,the insertion of organic EML promotes the hole injection,and eliminates excess electrons from QD to HTL,thus leading to a better match of hole and electron injection in the *** the basis of the above benefits,the optimal QLED with a 10 nm organic EML offered~2-fold improvements of CE and EQE,respectively,relative to the control ***,a better operational lifetime of QLEDs based on the organic EML was achieved.

关键词： quantum dot light emitting diodes organic emitting layer energy transfer