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Microstructure evolution of 7050 aluminum forgings during surface cumulative plastic deformation

Transactions of Nonferrous Metals Society of China 2025年第1期35卷 45-59页

作者： Jian-liang HU Ze-xiong ZHANG Cheng XING Xiu-jiang WU Shi-quan HUANG Hong BO Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Hebei Engineering Technology Research Center of Metal Precision Plastic Processing Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

To elucidate the mechanisms of regulating the microstructure uniformity in 7050 aluminum forgings through surface cumulative plastic deformation(SCPD),the microstructure under different solution treatments was investigated using metallographic observation(OM),electron backscatter diffraction(EBSD),transmission electron microscopy(TEM),and X-ray diffraction(XRD).The findings demonstrate that the most uniform microstructure in the forgings is achieved with a solution treatment at 470℃for 30 *** SCPD process generates a significant number of needle-shaped precipitates,resulting in a higher dislocation density and stored *** treatments alleviate the pinning effect of second-phase particles and facilitate static recrystallization(SRX)in forgings,leading to a reduction in grain ***,mechanical testing results demonstrate 7%−13%increase in tensile strength and more uniform elongation of the forgings in different directions.

关键词： microstructure homogeneity surface cumulative plastic deformation(SCPD) static recrystallization(SRX) dislocation density

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Effect of Co Content on Microstructure and Mechanical Properties of High-Entropy High-Temperature Shape Memory Alloy

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稀有金属材料与工程 2025年第1期54卷 10-16页

作者： Zhao Yanchun Jin Bo Feng Yuanfei Ma Huwen Yu Zhiqi Feng Li Liaw Peter K State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of Technology Wenzhou 325105China Department of Materials Science and Engineering University of TennesseeKnoxville TN37996USA

(TiZrHf)_(50)Ni_(30)Cu_(20-x)Co_(x)(x=2,4,6,at%)high-entropy high-temperature shape memory alloys were fabricated by watercooled copper crucible in a magnetic levitation vacuum melting furnace,and the effects of Co content on microstructure and mechanical properties were *** results indicate that the grain size of the alloy decreases with increasing the Co *** the as-cast state,the alloy consists primarily of the B19′phase,with a trace of B2 *** fracture morphology is predominantly composed of the B19′phase,whereas the B2 phase is nearly *** the Co content or reducing the sample dimensions(d)markedly enhance the compressive strength and ductility of the *** d=2 mm,the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy demonstrates the optimal mechanical properties,achieving a compressive strength of 2142.39±1.8 MPa and a plasticity of 17.31±0.3%.The compressive cyclic test shows that with increasing the compressive strain,the residual strain of the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy increases while the recovery ability *** superelastic recovery capability of the alloy is continuously *** superelastic recovery rate increases from 1.36%to 2.12%,the residual strain rate rises from 1.79%to 5.52%,the elastic recovery rate ascends from 3.86%to 7.36%,while the total recovery rate declines from 74.48%to 63.20%.

关键词： high-temperature shape memory alloy high-entropy alloy microstructure mechanical property

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Progress on Microstructure and Performance Optimization in H/MEAs Regulated by Single and Hierarchical Heterostructures

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稀有金属材料与工程 2025年第3期54卷 640-664页

作者： Wang Bing Li Chunyan Wang Xinhua Li Xiaocheng Kou Shengzhong State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China Wenzhou Engineering Institute of Pump&Valve Lanzhou University of TechnologyWenzhou 325105China

The development of high-performance structural and functional materials is vital in many industrial ***-and medium-entropy alloys(H/MEAs)with superior comprehensive properties owing to their specific microstructures are promising candidates for structural *** importantly,multitudinous efforts have been made to regulate the microstructures and the properties of H/MEAs to further expand their industrial *** various heterostructures have enormous potential for the development of H/MEAs with outstanding ***,multiple heterogeneous structures with single and hierarchical heterogeneities were discussed in ***,preparation methods for compositional inhomogeneity,bimodal structures,dualphase structures,lamella/layered structures,harmonic structures(core-shell),multiscale precipitates and heterostructures coupled with specific microstructures in H/MEAs were also systematically *** deformation mechanisms induced by the different heterostructures were thoroughly discussed to explore the relationship between the heterostructures and the optimized properties of H/*** contributions of the heterostructures and advanced microstructures to the H/MEAs were comprehensively elucidated to further improve the properties of the ***,this review discussed the future challenges of high-performance H/MEAs for industrial applications and provides feasible methods for optimizing heterostructures to enhance the comprehensive properties of H/MEAs.

关键词： heterogeneous structures H/MEAs HDI effect microstructure regulation performance optimization

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Polarization-encoded neural networks with simplified grating patch

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Science China(Technological Sciences) 2025年第2期68卷 269-277页

作者： Chengyan ZHONG Xiang WANG Lingfei LI Yuanchi CUI Lei XIAO Dawei SONG Junxiong GUO Wen HUANG Yufeng GUO Yu LIU College of Integrated Circuit Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing 210023China College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation Centre Zhejiang UniversityHangzhou 310027China Nanjing Mumusili Technology Co. LTDNanjing 211100China School of Integrated Circuits Tsinghua UniversityBeijing 100084China Institute of Advanced Study School of Electronic Information and Electrical EngineeringChengdu UniversityChengdu 610106China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Optical neural networks(ONNs)offer a promising solution for high-performance,energy-efficient artificial intelligence hardware by leveraging the parallelism and speed of ***,the large-scale implementation of ONNs remains challenging due to the bulky footprint and complex control of optical *** this work,we propose and simulate a plasmonic polarized synaptic architecture that overcomes the diffraction limit and enables ultra-compact *** tuning the polarization state of incident light,the optical transmittance through each plasmonic unit can be dynamically adjusted to represent a synaptic *** plasmonic structures,with features as small as 40 nm,operate well below this limit in the visible spectrum(400-750 nm).Compared with diffraction and interference-based circuit designs,our proposed method achieves a substantial reduction in synaptic density by factors of 150000-fold and 1500-fold,***,we successfully demonstrate a proof-of-concept plasmonic ONN applied to the Canadian Institute for advanced Research—10 classes(CIFAR-10)dataset using a Visual Geometry Group network with 16 layers(VGG16)*** training for 80 epochs,the network achieves an accuracy of 93%.The polarization-tunable plasmonics paves the way towards scalable ONNs for next-generation artificial intelligence(AI)accelerators and smart sensors.

关键词： optical neural networks polarization dependent nanophotonic ultra-compact devices diffraction limit

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Knowledge-assisted Approach for Contactless Current Measurement in Multiconductor Systems

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IEEE Transactions on Industry Applications 2025年

作者： Ma, Chaojun Xu, Yingying Chen, Qing Jiao, Yang Qu, Zeming He, Cheng Huazhong University of Science and Technology School of Electrical and Electronic Engineering Institute of Artificial Intelligence School of Artificial Intelligence and Automation Wuhan430074 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

Current measurements of multiconductor systems are essential for smart grids, but conventional intrusive measurement approaches require power outages before deployment and maintenance and thus are expensive and may reduce system stability. Though many contactless current measurement approaches have been proposed in recent years, the challenge of easing the impact of conductor positions and decoupling current information remains. This paper proposes a novel approach that combines a cost-effective annular magnetic field (MF) sensor array with an inverse calculation technique for precise, contactless current measurements in multiconductor systems. Specifically, the MF sensor array captures the MF distribution surrounding the multiconductor systems for characterizing the coupled current information. Then, the hardware-oriented measurement task is reformulated into a computational optimization problem, where the currents and conductor positions are mathematically related to the MF distribution for decoupling. Meanwhile, an effective algorithm is tailored, where knowledge about the current and MF distribution is used to generate promising initial solutions for efficiency and effectiveness improvement. Experimental results demonstrate that the proposed approach achieves high accuracy in current measurement considering the impact of conductor positions, with error rates maintained below 1% and 2% in balanced and unbalanced cases, respectively. Additionally, an abnormal MF sensing data correction method is developed to further ensure measurement accuracy, showing resilience to sensor anomalies and maintaining a relative measurement error below 2% after correction. © 1972-2012 IEEE.

关键词： Smart power grids

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Programming anti-ribozymes to sense trigger RNAs for modulating gene expression in mammalian cells

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Synthetic and Systems Biotechnology 2025年第3期10卷 827-834页

作者： Zhang, Wenhui Zhao, Shi Wang, Mengyuan Lou, Chunbo Xiang, Yanhui Wu, Qiong Center for Cell and Gene Circuit Design CAS Key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic Biology Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China State Key Laboratory of Green Biomanufacturing MOE Key Lab. Bioinformatics Center for Synthetic and Systems Biology School of Life Sciences Tsinghua University Beijing 100084 China

Synthetic RNA-based switches provide distinctive merits in modulating gene expression. Simple and flexible RNA-based switches are crucial for advancing the field of gene regulation, paving the way for innovative tools that can sense and manipulate cellular processes. In this research, we have developed programmable ribozymes that are capable of suppressing gene expression in response to specific, endogenously expressed trigger RNAs. We engineer ribozymes by introducing upstream antisense sequences (anti-ribozymes) to inhibit the self-cleaving activity of the hammerhead ribozyme and open the expression of the target gene. The trigger RNA is designed to recognize and bind to complementary sequences within the anti-ribozymes, thereby inhibiting their ability to direct protein synthesis. The anti-ribozyme performance is optimized by regulating the essential sequence modules that play a crucial role in determining the specificity and efficiency of the anti-ribozyme's interaction with its trigger RNA. By applying this switch mechanism to various ribozyme designs, we have shown that it is possible to achieve control over gene expression across a wide range of trigger RNAs. By exploiting these programmable anti-ribozymes, we aim to create a powerful tool for controlling gene expression in mammalian cells, which could have important implications for basic research, disease diagnosis, and therapeutic interventions. © 2025 The Authors

关键词： Anti-ribozyme Antisense RNA sequence Gene expression regulation Ribozyme RNA-based switch Trigger RNA sequence

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CO_(2) adsorption and activation on p-block catalyst Ga_(2)O_(3)

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Science China Materials 2025年第2期68卷 590-596页

作者： Zhizhuang Liu Xiaoxu Kuang Baowen Li Chenghua Sun Rong Tu Song Zhang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Chemistry and Biotechnology Swinburne University of TechnologyHawthornVictoria 3122Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The fixation and conversion of CO_(2)frommedium-and high-temperature industrial exhaust gases arescientifically important and challenging tasks owing to theharsh conditions ***_(2)O_(3),a stable p-block compound,is surprisingly active in the thermal conversion of hot CO_(2)waste gas,but its underlying mechanism remains *** study,we investigated CO_(2)adsorption and activationacross 11 different Ga_(2)O_(3)-terminated faces using densityfunctional *** transfer and chemical bond analysesrevealed the occurrence of two distinct activation mechanismsinvolving synchronous electron gain and loss,driven by astrong synergetic effect between Ga cations and O anions onthe substrate *** Ga-O synergy enhances the CO_(2)activation efficiency compared with single active sites,with CO_(2)^(δ+) cation more readily capturing H atom than CO_(2)^(δ–).Tothe best of our knowledge,such a dual activation mechanismhas not been reported before,particularly for p-block *** findings provide new insights into the direct catalyticconversion of CO_(2)emissions and offer strategies for the rational design of industrial-grade catalysts for medium-andhigh-temperature CO_(2)tail gas conversion.

关键词： p-block catalyst gallium oxide carbon dioxide density functional theory synergetic mechanism

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Mild photothermal therapy-enhanced nano-ferroptosis inducer for potent treatment of advanced prostate cancer

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Nano Research 2025年第4期18卷 375-387页

作者： Xiao Hu Fei Li Xin-Hang Qian Yu-Sen Zhang Shuai Ke Yun-Xia Jin Shuai Yuan Yuan-Yuan Zhang Rui Li Lei Cao Lang Rao Xian-Tao Zeng Ling-Ling Zhang Center for Evidence-Based and Translational Medicine Zhongnan Hospital of Wuhan UniversityWuhan 430071China Institute of Chemical Biology Shenzhen Bay LaboratoryShenzhen 518132China Department of Urology Zhongnan Hospital of Wuhan UniversityWuhan 430071China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules&College of Chemistry and Chemical EngineeringHubei UniversityWuhan 430062China Xinjiang Key Laboratory of Solid State Physics and Devices School of Physics Science and TechnologyXinjiang UniversityUrumqi 830017China

Androgen deprivation therapy(ADT)and androgen receptor signaling inhibitors(ARSis)often have limited efficacy in patients with advanced prostate cancer(PCa)(especially AR-negative).Inducing ferroptosis in PCa cells is an attractive therapeutic *** this work,mesoporous polydopamine nanoparticles(MPDA NPs)were developed to simultaneously deliver Cu^(+)/Cu^(2+)ion pairs and glutathione peroxidase 4(GPX4)inhibitor RSL3 to tumor sites for enhanced treatment of *** prepared MPDA-Cu-RSL3@HA(MPCRH)NPs induced ferroptosis by promoting lipid peroxidation and regulating phospholipid profiles in PCa cells,and the above effects were further enhanced by mild photothermal therapy(mPTT)without damaging normal *** can promote reactive oxygen species(ROS)generation and degrade tumor extracellular matrix in vivo to promote nanodrugs intratumoral *** short,this work shows the great application potential of mPTT-enhanced nano-ferroptosis inducers in the field of PCa treatment,in order to provide a reasonable paradigm for nanodrug development and PCa treatment.

关键词： prostate cancer ferroptosis mild photothermal therapy chemodynamic therapy mesoporous polydopamine

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A universal approach to high-performance thermoelectric module design for power generation (vol 9, 101818, 2025)

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JOULE 2025年第4期9卷

作者： Cheng, Jinxuan Xue, Wenhua Zhang, Tianyu Li, Xiaofang Zhu, Yichen Yin, Li Yao, Honghao Fu, Zixuan Wu, Longzhi Chen, Chen Zhao, Peng Ma, Xiaojing Jiang, Feng Wang, Xiaodong Li, Mingyu Mao, Jun Wang, Yumei Cao, Feng Zhang, Qian School of Materials Science and Engineering and Institute of Materials Genome & Big Data Harbin Institute of Technology Shenzhen 518055 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 China School of Science Harbin Institute of Technology Shenzhen 518055 China Sauvage Laboratory for Smart Materials School of Materials Science and Engineering Harbin Institute of Technology Shenzhen 518055 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China School of Physical Sciences Great Bay University Dongguan 523000 China Institute of Special Environments Physical Sciences Harbin Institute of Technology Shenzhen 518055 China Beijing Branch of Songshan Lake Materials Laboratory Dongguan 523808 China

Thermoelectric modules fabricated by traditional welding fall short of achieving optimal conversion efficiencies, primarily due to performance degradation of materials at high temperatures, severe elemental diffusion, and residual thermal stress at the interface. Transient liquid phase bonding enables the realization of joints with high-melting-point compounds at low bonding temperatures, providing a promising solution for achieving "low-temperature bonding and high-temperature service." Owing to the low eutectic point of the solder and high melting points of compounds, we optimize the design of a germanium-telluride-based module at 533 K, which is successfully applied at the hot-side temperature of 773 K. Attributed to high-performance materials and reliable joints, the module realizes a high conversion efficiency of ∼15.1% and remains stable throughout 150 h of service. By adopting the same approach, the low- (Bi2Te3) and high-temperature (half-Heusler) modules are assembled. We provide a promising and general route for the assembly of full-temperature-range thermoelectric devices.

关键词： transient liquid phase bonding thermoelectric module intermetallic compounds GeTe

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Investigation on tensile modulus of lumen-bast fiber reinforced composites using multiscale simulation method

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2025年第5期42卷 2528-2537页

作者： Xia, Fan He, Liping Chen, Dachuan State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicles Hunan University Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China College of Civil Engineering Hunan University Changsha410082 China

Currently, the models for predicting the tensile modulus of bast fiber reinforced composites have not considered unique lumen microstructure of bast fibers. Therefore, in the present work, an equivalent model of lumen-bast fiber and its theoretical formula for calculating the elastic modulus were proposed in this study by combining the rule of mixture and Micro-CT technology. On this basis, a representative volume element (RVE) model of ramie fiber reinforced composite (RFPC) which considered lumen microstructures was established using multiscale simulation method, and its tensile modulus was computed. The validity of the RVE model was verified by experimental results. Additionally, the influence weights of four parameters (fiber content, fiber lumen ratio, fiber orientation, and aspect ratio) on the tensile elastic modulus of RFPC were investigated using orthogonal experimental design and variance analysis. It was found that fiber content and fiber orientation are the primary factors affecting the tensile modulus of RFPC. A polynomial fitting method was employed to obtain a predictive equation for estimating the tensile modulus of RFPC using these four parameters as independent variables. The main effects and synergistic effects of parameters on the tensile modulus of RFPC were systematically analyzed. This research provides a prediction method for estimating the tensile modulus of lumen-bast fiber reinforced composites and can be served as a theoretical basis for controlling their tensile performance. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Jute fibers

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