|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Si-Assisted Solidification Path and Microstructure Control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting显示文摘The construction and application of traditional high-strength 7075 aluminum alloy(Al7075) through selective laser melting(SLM) are currently restricted by the serious hot cracking phenomenon. To address this critical issue, in this study, Si is employed to assist the SLM printing of high-strength Al7075. The laser energy density during SLM is optimized, and the eff ects of Si element on solidification path, relative density, microstructure and mechanical properties of Al7075 alloy are studied systematically. With the modified solidification path, laser energy density, and the dense microstructure with refined grain size and semi-continuous precipitates network at grain boundaries, which consists of fine Si, β-MgSi, Q-phase and θ-AlCu, the hot cracking phenomenon and mechanical properties are eff ectively improved. As a result, the tensile strength of the SLM-processed Si-modified Al7075 can reach 486 ± 3 MPa, with a high relative density of ~ 99.4%, a yield strength of 291 ± 8 MPa, fracture elongation of(6.4 ± 0.4)% and hardness of 162 ± 2(HV) at the laser energy density of 112.5 J/mm~3. The main strengthening mechanism with Si modification is demonstrated to be the synergetic enhancement of grain refinement, solution strengthening, load transfer, and dislocation strengthening. This work will inspire more new design of high-strength alloys through SLM. | Junwei Sha Meixian Li Lizhuang Yang Xudong Rong Bowen Pu Dongdong Zhao Simi Sui Xiang Zhang Chunnian He Jianglin Lan Naiqin Zhao | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，9： | 1 |
| 2 | Manipulator tracking technology based on FSRUKF显示文摘Aiming at the shortcoming that the traditional industrial manipulator using off-line programming cannot change along with the change of external environment,the key technologies such as machine vision and manipulator control are studied,and a complete manipulator vision tracking system is designed.Firstly,Denavit-Hartenberg(D-H)parameters method is used to construct the model of the manipulator and analyze the forward and inverse kinematics equations of the manipulator.At the same time,a binocular camera is used to obtain the threedimensional position of the target.Secondly,in order to make the manipulator track the target more accurately,the fuzzy adaptive square root unscented Kalman filter(FSRUKF)is proposed to estimate the target state.Finally,the manipulator tracking system is built by using the position-based visual servo.The simulation experiments show that FSRUKF converges faster and with less error than the square root unscented Kalman filter(SRUKF),which meets the application requirements of the manipulator tracking system,and basically meets the application requirements of the manipulator tracking system in the practical experiments. | SHI Guoqing ZHANG Boyan ZHANG Jiandong YANG Qiming HUANG Xiaofeng QUE Jianyao PU Junwei GENG Xiutang | 2024 | Journal of Systems Engineering and Electronics2024，35，2： | 0 |
| 3 | Development of amulti-channel readout electronics verification system for MWDC detectors显示文摘Background The Multi-Wire Drift Chamber(MWDC)is among the significant detectors for CSR External Target Experiment(CEE).We require the MWDC detector’s front-end readout circuits to have a high integration,high count rate,and big dynamic range in order to measure the tracks of fore-angle products.Purpose In this paper,MWDC readout electronics verification system is shown,which is based on the front-end amplifier chip and Switched Capacitor Array(SCA)chip independently established by the project team.Results In the dynamic input range of 14 fC–950 fC,the readout electronics’energy measurement linearity is greater than 1%.The test results with MWDC illustrate that with a 55Fe source an energy resolution of 22.4%was acquired,and with cosmic rays the residual error is less than 400um. | Jiapeng Xu Canwen Liu Tianlei Pu Wei Liu Junwei Yan Zhi Qin Feng Li Zhi Deng Yi Qian Jie Kong | 2022 | Radiation Detection Technology and Methods2022，6，3： | 0 |
| 4 | Manipulating mechanical properties of graphene/Al composites by an in-situ synthesized hybrid reinforcement strategy显示文摘The structural deterioration caused by the relatively weak out-of-plane bending stiffness and the chemically-active edge area of graphene limits its outperformance in strengthening for Al matrix composites(AMCs).Introducing one-dimensional(1D)carbon nanotubes(CNTs)to graphene/metal system is one of the promised strategies to complement the weakness of 2D graphene and make full use of the outstanding intrinsic properties of the both reinforcements.To date,such synergistic strengthening and toughening mechanisms are largely unknown.In this study,AMCs reinforced by a novel hybrid reinforcement,i.e.,graphene nanosheets decorated with Cu nanoparticles and CNTs(Cu@GNS-CNTs),are fabricated by an in-situ synthesis method.The combined contrast experiments validated that the organically integrated reinforcing structure promotes the intrinsic load bearing capacity of GNS and the strain hardening capability of the Al matrix simultaneously.As a result,the composites achieved excellent tensile strength and uniform elongation with almost no loss.The strengthening mechanism originated primarily from the hybrid reinforcement exhibits superior load-transfer,fracture inhibition and dislocation storage capability by controlling the interface reaction to construct an effective interface structure without damaging the reinforcement.Our work identifies a promising structural modification strategy for 2D materials and provides mechanistic insights into the synergistic strengthening effect of graphene/CNTs hybrid reinforcement. | Lizhuang Yang Bowen Pu Xiang Zhang Junwei Sha Chunnian He Naiqin Zhao | 2022 | Journal of Materials Science & Technology2022，，28： | 0 |
| 5 | Development of the Mars energetic particles Completed by IMP analyzer显示文摘The Mars energetic particles analyzer(Mars-EPA for short)is one of the payloads of Mars probe,which de-veloped by IMP and Lanzhou Institute of Physics,will be lunched this year in China. | Zhao Hongyun Qian Yi Yang Haibo Su Hong Kong Jie Sun Zhiyu Yu Yuhong Sun Zhipeng Tang Shuwen Zhang Yongjie Fang Fang She Qianshun Pu Tianlei Yan Junwei Jing Yaran | 2019 | IMP & HIRFL Annual Report2019，，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员