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Hot deformation behavior and microstructure evolution of GH3536-TiB_(2) composites fabricated by powder metallurgy

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Science China(Technological Sciences) 2024年第7期67卷 2107-2124页

作者： ZHOU ShiPeng WANG Shuai HUANG LuJun ZHANG Rui CHEN Xin MENG FanChao CHEN Run SUN FengBo WANG CunYu GENG Lin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The hot deformation behavior and microstructure evolution of GH3536-TiB2composites fabricated by powder metallurgy(PM)were examined in the temperature range of 950–1150℃ and strain rate range of 0.001–1 s^(-1). The hot compression stress-strain curves and the constitutive equation were obtained. In addition, the hot processing map was drawn, which indicated that the appropriate hot working window was 950–1050℃/0.001–0.1 s^(-1)and 1050–1100℃/0.001–0.01 s^(-1). The microstructure analysis showed that the splitting and spheroidization of M3B2led to a decrease in size and volume fraction at 950–1100℃. At 1150℃,the eutectic microstructure of M_(3)B_(2)+ γ was formed due to the dissolution of M_(3)B_(2), which caused macroscopic cracking of the deformed sample. Additionally, the deformation temperature and the strain rate had little effect on the size and volume fraction of M_(3)B_(2). Besides, discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) were found in the deformed microstructure, while the former was dominant. Within the test range of this work, the dynamic recrystallization(DRX) fraction of the deformed composites was high due to the bulging nucleation of numerous interfaces. The DRX grain size increased with increasing deformation temperature or decreasing strain rate. Texture analysis showed that the deformation texture of //compression direction RD existed in the matrix when the deformation temperature was below 1100℃, and the texture type became //RD at 1100℃. Additionally, it was also found that the //RD texture was formed in M3B2under the strain rates of 0.1 and 0.01 s^(-1).

关键词： GH3536 alloy matrix composites powder metallurgy hot deformation behavior microstructure evolution

A wafer-level 3D packaging structure with Benzocyclobutene as a dielectric for multichip module fabrication

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Journal of Semiconductors 2009年第10期30卷 153-158页

作者：耿菲丁晓云徐高卫罗乐 Graduate University of the Chinese Academy of Sciences State Key Laboratory of transducer technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

A new wafer-level 3D packaging structure with Benzocyclobutene（BCB）as interlayer dielectrics（ILDs） for multichip module fabrication is proposed for application in the Ku-band *** packaging structure consists of two layers of BCB films and three layers of metallized films,in which the monolithic microwave IC（MMIC）,thin film resistors,striplines and microstrip lines are *** etched cavities fabricated on the silicon substrate are used for mounting active and passive *** layers cover the components and serve as ILDs for *** bumps are used as electric interconnections between different layers,which eliminates the need to prepare vias by costly dry etching and deposition *** order to get high-quality BCB films for the subsequent chemical mechanical planarization（CMP）and multilayer metallization processes,the BCB curing profile is optimized and the roughness of the BCB film after the CMP process is kept lower than 10 *** thermal,mechanical and electrical properties of the packaging structure are *** thermal resistance can be controlled below 2℃/*** average shear strength of the gold bumps on the BCB surface is around 70 N/mm^*** performances of MMIC and interconnection structure at high frequencies are optimized and *** S-parameters curves of the packaged MMIC shift slightly showing perfect transmission *** insertion loss change after the packaging process is less than 1 dB range at the operating frequency and the return loss is less than –8 dB from 10 to 15 GHz.

关键词： wafer-level benzocyclobutene embedded MMIC and passives RF application

A triangular architectural relation model among sustainability,beauty,and power

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Frontiers of Architectural Research 2024年第4期13卷 699-711页

作者： Ján Legény RobertŠpaček TomášHubinský Lucia Benkovičová Faculty of Architecture and Design Slovak University of Technology in BratislavaBratislavaSlovakia

Sustainability,beauty,and power are notions that hit our contemporary perception every ***,they have been an integral part of architecture and urban planning in various forms since the *** paper presents their fundamental descriptions,followed by an assessment of their mutual relations and impact on architecture through a triangular architectural relation model developed by the authors of the *** the theoretical thought experiment,it highlights eight boundary models along with their main characteristics,in particular,the implosion,explosion,shared-control,utilitarian,no-control,supremacy,inside-forced,and outside-forced architectural related *** models can help predict future events,explain past events,make decisions,and plan strategies,or reveal problems and propose new *** applications include determination of the causes of certain results or finding out the responsibility and mechanisms that led to *** authors are of the opinion that the mutual denominator of sustainability,beauty,and power represents ethics that should be forced in architectural education and practice.

关键词： Triangular architectural relation model Sustainability Beauty Power Thought experiment Interpretation

Heteroepitaxial Growth of Single-Crystalline Diamond Film

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Chinese Physics Letters 1998年第11期15卷 819-821页

作者： WANG Qi-min CHEN Qing-gui SHI Ri-hua DONG Rong-kang NI Ru-shan ZHU Ji-qian State Key Laboratory of transducer technology Shanghai Institute of MetallurgyChinese Academy of SciencesShanghai 200050

Using high temperature heteroepitaxial growth method the single-crystalline diamond film growth conditions have been studied by Raman spectrum and transmission electron *** temperature,low alcohol concentration,slow gas flow velocity,long epitaxial time and substrate located near the gas exit side on the susceptor are the favourable conditions for growing single-crystalline diamond film.

关键词： diffraction. film. epitaxial

In situ nanoscale refinement by highly controllable etching of the(111) silicon crystal plane and its influence on the enhanced electrical property of a silicon nanowire

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Journal of Semiconductors 2011年第12期32卷 53-57页

作者：龚宜彬戴鹏飞高安然李铁周萍王跃林 Science and technology on Micro-System Laboratory State Key Laboratory of Transducer TechnologyShanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

Nanoscale refinement on a （100） oriented silicon-on-insulator （SOI） wafer was introduced by using tetra-methyl-ammonium hydroxide （TMAH, 25 wt%） anisotropic silicon etchant, with temperature kept at 50 ℃ to achieve precise etching of the （111） crystal plane. Specifically for a silicon nanowire （SiNW） with oxide sidewall protection, the in situ TMAH process enabled effective size reduction in both lateral （2.3 nm/min） and vertical （1.7 nm/min） dimensions. A sub-50 nm SiNW with a length of microns with uniform triangular cross-section was achieved accordingly, yielding enhanced field effect transistor （FET） characteristics in comparison with its 100 nm- wide pre-refining counterpart, which demonstrated the feasibility of this highly controllable refinement process. Detailed examination revealed that the high surface quality of the （111） plane, as well as the bulk depletion property should be the causes of this electrical enhancement, which implies the great potential of the as-made cost-effective SiNW FET device in many fields.

关键词： TMAH etching nanofabrication silicon nanowire field effect transistor

The effects of cure temperature history on the stability of polyimide films

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Journal of Semiconductors 2013年第6期34卷 27-31页

作者：宁文果李珩朱春生罗乐陈栋段珍珍 The State Key laboratories of transducer technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences R&D Department Jiangyin Changdian Advanced Packaging Co.LTD

The effects of cure temperature history on the stability of hinged structure poly（4,4-oxydiphenylene pyromellitimide）（PMDA-ODA） polyimide were studied by dynamic mechanical *** polyimide films were cured under different curing conditions and peeled off by substrate *** was found that a proper cure time and temperature ramp rate improves the stability in terms of higher glass transition *** minutes at 375℃or 200℃is a beneficial high glass transition *** temperature ramp rate should be between 2℃/min and 10℃/min,which is neither too high nor too low.

关键词： curing of polymers polyimide stabilization DMA

Self-assembled all-oxides three-phase vertically aligned nanocomposite thin film with multifunctionality

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Nano Research 2024年第9期17卷 8226-8232页

作者： Jijie Huang Yuan Fang Ping Lu Juanjuan Lu Haiyan Wang School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China School of Materials Engineering Purdue UniversityWest LafayetteIN 47907USA Sandia National laboratories AlbuquerqueNew Mexico 87185USA School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47907USA

Multi-phase vertically aligned nanocomposite(MP-VAN)thin films represent a promising avenue for achieving complex multifunctionality,exploring novel interfacial phenomena,and enabling complex metamaterial designs and *** this study,a novel self-assembled all-oxides three-phase VAN system was conceptualized and fabricated utilizing pulsed laser deposition(PLD)with a single composite *** microstructural analysis reveals the presence of three distinct phases:LiNbO_(3),CeO_(2-x),and LiNbCe_(1-x)O_(y)within the MP-VAN ***,ferroelectric,dielectric,optical anisotropy,and magnetic properties were systematically investigated to showcase the multifunctionality inherent in these *** work presents a pioneering approach to designing and realizing MP-VAN systems,and opens up opportunities for tailoring the complex three-dimensional(3D)physical properties and property coupling of VAN films towards diverse device applications.

关键词： thin film three-phase vertically aligned nanocomposite multifunctionality ferroelectricity optical anisotropy

Ultrasonic Energy Transference Based on an MEMS ZnO Film Array

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Chinese Physics Letters 2012年第12期29卷 208-210页

作者： WU Shao-Hua ZHAO Zhan ZHAO Jun-Juan GUO Li-Jun DU Li-Dong FANG Zhen KONG De-Yi XIAO Li GAO Zhong-Hua State Key Laboratory of transducer technology Institute of ElectronicsChinese Academy of SciencesBeijing 100190 Graduate University of Chinese Academy of Sciences Beijing 100049 State Key Laboratory of transducer technology Institute of Intelligent MachinesChinese Academy of SciencesHefei 230031

An ultrasonic energy transference system with a ZnO square piezoelectric thin-film array(SPTFA)structure is *** design principle of the system is analyzed,and a device with the SPTFA structure is successfully fabricated based on MEMS *** characteristics of the energy transference system are investigated in *** experimental results reveal that the resonant frequency of the system is 13 MHz,the maximum voltage of the receiving end reaches 10.87 V when the amplitude of excitation voltage is 10 V,at that time the output power of system is 5.377 mW,and power density is 2.581 mW/cm^(2).The light emitting diode is lit successfully by the system in a distance of 3 mm.

关键词： system excitation resonant

Reputation-based joint optimization of user satisfaction and resource utilization in a computing force network

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Frontiers of Information technology & Electronic Engineering 2024年第5期25卷 685-700页

作者： Yuexia FU Jing WANG Lu LU Qinqin TANG Sheng ZHANG China Mobile Research Institute Beijing 100053China Purple Mountain laboratories Nanjing 211111China China Mobile Communications Corporation Beijing 100033China

Under the development of computing and network convergence,considering the computing and network resources of multiple providers as a whole in a computing force network(CFN)has gradually become a new ***,since each computing and network resource provider(CNRP)considers only its own interest and competes with other CNRPs,introducing multiple CNRPs will result in a lack of trust and difficulty in unified *** addition,concurrent users have different requirements,so there is an urgent need to study how to optimally match users and CNRPs on a many-to-many basis,to improve user satisfaction and ensure the utilization of limited *** this paper,we adopt a reputation model based on the beta distribution function to measure the credibility of CNRPs and propose a performance-based reputation update ***,we formalize the problem into a constrained multi-objective optimization problem and find feasible solutions using a modified fast and elitist non-dominated sorting genetic algorithm(NSGA-II).We conduct extensive simulations to evaluate the proposed *** results demonstrate that the proposed model and the problem formulation are valid,and the NSGA-II is effective and can find the Pareto set of CFN,which increases user satisfaction and resource ***,a set of solutions provided by the Pareto set give us more choices of the many-to-many matching of users and CNRPs according to the actual situation.

关键词： Computing force network Resource scheduling Performance-based reputation User satisfaction