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Selective laser melted high Ni content TiNi alloy with superior superelasticity and hardwearing

Journal of Materials Science & Technology 2022年第21期116卷 246-257页

作者： Hui Shen Qingquan Zhang Ying Yang Yang Ren Yanbao guo Yafeng Yang Zhonghan Li Zhiwei Xiong Xiangguang Kong Zhihui Zhang fangmin guo Lishan Cui Shijie Hao State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China The Key Laboratory of Bionic Engineering(Ministry of Education)and the College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Department of Physics City University of Hong KongKowloonHong KongChina College of Mechanical and Transportation Engineering China University of PetroleumBeijing 102249China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

TiNi alloys with high content Ni(52-55 at.%)are perfectly suitable for preparing wear-and corrosionresistant parts that service on the space station,spacecraft,and submarine,because of their superior superelasticity,high strength,and ***,the fabrication of complicated Ni-rich TiNi parts by the traditional machining method often faces problems of poor precision,low efficiency,and high *** this work,we succeed in preparing an excellent Ti_(47)Ni_(53) alloy by selective laser melting(SLM),and thus,open a new way for the efficient and precise formation of complicated Ni-rich TiNi parts with superelasticity and *** optimized processing window for compact parts without defects is *** elaborately fabricated Ti_(47)Ni_(53) alloy exhibited a breaking strain of 11%,a breaking stress of 2.0 GPa,a superelastic strain of 9%,and a better hardwearing than that of casting and quenched Ti_(47)Ni_(53) ***,the microstructure,phase transformation,and deformation,as well as their influence mechanisms are investigated by in situ transmission electron microscope(TEM)and high-energy X-ray diffraction(HE-XRD).The results obtained are of significance for both fundamental research and technological applications of SLM-fabricated high Ni content TiNi alloys.

关键词： Selective laser melting High Ni content TiNi Superelasticity Wear In situ high-energy X-ray diffraction Microstructure

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The theory and experiment of very-long-wavelength 256×1 GaAs/Al_(x)Ga_(1-x)As quantum well infrared detector linear arrays

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Science China(Physics,Mechanics & Astronomy) 2008年第7期51卷 805-812页

作者： guo fangmin LI Ning XIONG DaYuan ZHEN HongLou XU XiangYan HOU Ying DING RuiJun LU Wei HUANG Qi ZHOU JunMing National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Institute of Physics Chinese Academy of SciencesBeijing 100080China

The 256×1 linear array of multiple quantum wells infrared photodetector (QWIP) is designed and fabricated for the peak response wavelength at λP=14.6 μm. The response spectral width is bigger than 2.2 μm. The two-dimensional (2D) diffractive coupling grating has been formed on the top QWIP photosensitive pixel for coupling the infrared radiation to the infrared detective layers. The performance of the device at VB=3 V and T=45 K has the responsibility 4.28×10-2 (A/W), the blackbody detectivity Db*=5.14×109 (cm·Hz1/2/W), and the peak detectivity Dλ*=4.24× 1010 (cm·Hz1/2/W). The sensor pixels are connected with CMOS read out circuit (ROC) hybridization by indium bumps. When integral time is 100 μs, the linear array has the effective pixel of QWIP FPA Nef of 99.2%, the average responsibility  (V/W) of 3.48×106 (V/W), the average peak detectivity Dλ* of 8.29×109 (cm·Hz1/2/W), and the non-uniformity UR of 5.83%. This device is ready for the thermal image application.

关键词： quantum well focal plane arrays very long wavelength infrared detector diffraction grating

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Innovations in metallurgical and materials processes:advancing liquid theory and honoring ***-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research International 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,***-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of *** under the assumption that molecul... 详细信息

关键词： chemistry liquid complexes

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新原理光电探测阵列的微光响应测试研究

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红外与激光工程 2014年第8期43卷 2546-2551页

作者：刘晓艳王明甲郭方敏华东师范大学教育部极化材料与器件实验室上海200241

针对暗电流低、灵敏度高等优点的新原理量子效应光电探测器,设计和加工了增益可调CTIA读出电路,以获得宽动态范围读出。读出电路芯片与1×64元量子效应光电探测器集成封装,在室温(300K)条件下进行读出测试研究。光源采用633nmHe-Ne激光... 详细信息

针对暗电流低、灵敏度高等优点的新原理量子效应光电探测器,设计和加工了增益可调CTIA读出电路,以获得宽动态范围读出。读出电路芯片与1×64元量子效应光电探测器集成封装,在室温(300K)条件下进行读出测试研究。光源采用633nmHe-Ne激光器,直径50μm光斑聚焦照射。测试结果表明:器件偏压为-0.1V,激光功率150pW,积分时间78μs,响应电压55mV,电压响应率达到3.67E+08V/W。根据测试结果,提出了进一步降低暗电流影响的改进测试方案。

关键词：微光读出量子效应器件高灵敏度增益可调读出电路暗电流

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NiTi-Nb原位复合材料的准线性超弹性变形

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金属学报 2023年第11期59卷 1419-1427页

作者：姜江郝世杰姜大强郭方敏任洋崔立山江西省科学院江西省铜钨新材料重点实验室南昌330096 中国石油大学(北京)新能源与材料学院昌平102249 X-ray Science Division Argonne National LaboratoryArgonneIllinois 60439USA

据文献报道,Nb纳米线增强NiTi记忆合金复合材料可展现超常的准线性超弹特性。为揭示该准线性超弹特性的产生和变形机制,通过真空感应熔炼、锻造、拔丝方法原位合成了NiTi-Nb复合材料丝材。TEM显微分析表明,Nb纳米线沿丝材轴向平行分布... 详细信息

据文献报道,Nb纳米线增强NiTi记忆合金复合材料可展现超常的准线性超弹特性。为揭示该准线性超弹特性的产生和变形机制,通过真空感应熔炼、锻造、拔丝方法原位合成了NiTi-Nb复合材料丝材。TEM显微分析表明,Nb纳米线沿丝材轴向平行分布在纳米晶NiTi基体中。该材料在经历一次9%的预变形后会展现准线性超弹特性,其屈服强度达1.7 GPa,表观Young's模量约34 GPa,准线性超弹性应变接近5.5%。同步辐射高能X射线原位拉伸实验结果表明,准线性超弹性的产生与以下2点原因有关:(1)复合材料经历预变形后,Nb纳米线和NiTi基体间会产生耦合力,再次加载时,NiTi所受的耦合拉应力可以将局部区域应力诱发马氏体相变所需的外应力降低到零附近,并且耦合力越大,加载初期的相变速率越高,经过适当的预变形后,加载初始就能够持续发生高速率相变;(2) NiTi中耦合拉应力呈梯度分布,使相变应力-应变曲线不再是常见的“平台型”,转变为“硬化型”斜线。

关键词： NiTi-Nb复合材料应力诱发马氏体相变准线性超弹性

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NiTi-NbTi原位复合材料的Lüders带型变形和载荷转移行为

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金属学报 2021年第7期57卷 921-927页

作者：姜江郝世杰姜大强郭方敏任洋崔立山江西省科学院江西省铜钨新材料重点实验室南昌330096 中国石油大学(北京)新能源与材料学院北京102249 X-ray Science Division Argonne National LaboratoryArgonneIllinois 60439USA

采用电弧熔炼、锻造和拔丝方法原位合成了一种高Nb含量的NiTi-NbTi记忆合金复合材料。TEM显微分析显示,在材料内部纳米尺度的NbTi和NiTi纤维沿丝材轴向交替分布,NbTi纤维体积分数高达约70%。通过同步辐射高能X射线原位拉伸实验研究了复... 详细信息

采用电弧熔炼、锻造和拔丝方法原位合成了一种高Nb含量的NiTi-NbTi记忆合金复合材料。TEM显微分析显示,在材料内部纳米尺度的NbTi和NiTi纤维沿丝材轴向交替分布,NbTi纤维体积分数高达约70%。通过同步辐射高能X射线原位拉伸实验研究了复合材料的变形机制。结果显示,虽然NiTi体积分数仅约30%,但复合材料的变形仍受NiTi的应力诱发相变控制。在加载初期,复合材料先发生均匀变形,并且在拉伸曲线出现屈服平台之前,NiTi已发生均匀相变。当平台出现之后,NiTi转而发生Lüders带型相变,进而诱发NbTi也随之发生Lüders带型变形,使整个复合材料都展现Lüders带型变形。Lüders带前沿存在载荷转移现象,载荷由正在发生相变的B2-NiTi同时转移到NbTi相及之前在均匀相变过程中形成的B19’-TiNi马氏体相。

关键词： NiTi-NbTi复合材料形状记忆合金 Lüders带型变形

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宽动态范围读出电路研究

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半导体技术 2011年第1期36卷 41-44页

作者：韩建强郭方敏华东师范大学信息学院教育部极化材料与器件重点实验室上海200241

为提高光电探测器的读出性能,设计的电容互阻放大器(CTIA)注入效率大于99%,线性度达99.84%。相关双采样电路(CDS)采用不同控制时序,读出电路可以工作在噪声抑制模式和两次采样模式。噪声抑制模式时读出电路平均噪声为0.91 mV,动态范围为... 详细信息

为提高光电探测器的读出性能,设计的电容互阻放大器(CTIA)注入效率大于99%,线性度达99.84%。相关双采样电路(CDS)采用不同控制时序,读出电路可以工作在噪声抑制模式和两次采样模式。噪声抑制模式时读出电路平均噪声为0.91 mV,动态范围为66.85 dB,两次采样模式平均噪声为5.82 mV,动态范围扩展到90.82 dB。

关键词：光电探测器读出电路电容互导放大器噪声动态范围

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Emerging direct current triboelectric nanogenerator for high-entropy mechanical energy harvesting

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Science China(Technological Sciences) 2024年第5期67卷 1297-1316页

作者： CHEN Jie guo RuiLong guo HengYu College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Department of Applied Physics Chongqing UniversityChongqing 401331China

In the era of the Internet of Things(IoT),the provision of sustainable power to distributed,mobile,and low-power-consumption electronic devices is a critical *** overcome this challenge,the triboelectric nanogenerator(TENG),a highly efficient high-entropy mechanical energy harvesting device,was developed in *** device enables the direct conversion of irregular and low-frequency mechanical energy into pulsed alternating current(AC)***,the incompatibility of most electronic devices with AC signals necessitates rectifier circuits or generators that deliver direct current(DC)*** recent years,DC-TENGs have undergone extensive development,achieving significant milestones in various application fields while also facing crucial challenges that require *** this review,three categories of DC-TENG devices with distinct operating mechanisms are comprehensively explored:multiphase coupling,mechanical rectification,and air *** typical structures and working mechanisms are thoroughly discussed,and specific output performance limitations,along with corresponding optimization strategies,are ***,the applications of DC-TENGs in various scenarios are ***,the challenges faced by DC-TENGs and potential solutions are analyzed to guide further advancements in this technology.

关键词： TENG direct current working mechanisms output performance limitations optimization strategies

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Physicochemical principles of hydrogen metallurgy in blast furnace

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Journal of Iron and Steel Research International 2024年第1期31卷 46-63页

作者： Han-jie guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China

Based on the stoichiometric method and the free energy minimization method,an ideal model for the reduction of iron oxides by carbon and hydrogen under blast furnace conditions was established,and the reduction efficiency and theoretical energy consumption of the all-carbon blast furnace and the hydrogen-rich blast furnace were *** results show that after the reduction reaction is completed at the bottom of the blast furnace,the gas produced by reduction at 1600℃still has a certain excessive reduction capacity,which is due to the hydrogen brought in by the hydrogen-rich blast as well as the excess carbon monoxide generated by the reaction of the coke and the oxygen brought in by the *** the process of the gas with excessive reduction capacity rising from the bottom of the blast furnace and gas reduction process,the excessive reduction capacity of the gas gradually decreases with the increase in the dydrogen content in the *** the all-carbon blast furnace,the excess gas reduction capacity is the strongest,and the total energy consumption per ton of iron reduction is the *** shows that,for the current operation mode of the blast furnace,adding hydrogen in the blast furnace cannot reduce the consumption of carbon required for reduction per ton of iron,but rather increases the consumption of carbon.

关键词： Hydrogen metallurgy Excess gas reduction capacity Theoretical energy consumption Hydrogen-rich blast furnace Thermodynamic model Gibbs minimum free energy method

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Control Strategies for Digital Twin Systems

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 170-180页

作者： guo-Ping Liu IEEE the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

With the continuous breakthrough in information technology and its integration into practical applications, industrial digital twins are expected to accelerate their development in the near future. This paper studies various control strategies for digital twin systems from the viewpoint of practical *** make full use of advantages of digital twins for control systems, an architecture of digital twin control systems, adaptive model tracking scheme, performance prediction scheme, performance retention scheme, and fault tolerant control scheme are proposed. Those schemes are detailed to deal with different issues on model tracking, performance prediction, performance retention, and fault tolerant control of digital twin systems. Also, the stability of digital twin control systems is analysed. The proposed schemes for digital twin control systems are illustrated by examples.

关键词： Digital twin control systems fault tolerant control model tracking performance prediction performance retention

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