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| 1 | Investigation on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys with various Zn/Mg ratios显示文摘The effects of Zn/Mg ratios on microstructure and mechanical properties of Al-Zn-Mg-Cu alloys aged at 150℃have been investigated by using tensile tests,optical metallography,scanning electron microscopy,transmission electron microscopy and atom probe tomography analyses.With increasing Zn/Mg ratios,the ageing process is significantly accelerated and the time to peak ageing is reduced.T’phase predominates in alloys of lower Zn/Mg ratios whileη’phase predominates in alloys with a Zn/Mg ratio over 2.86.Co-existence of T’phase andη’phase with a large number density is beneficial to the high strength of alloys.Such precipitates together with narrow precipitate free zones cause a brittle intergranular fracture.A strength model has been established to predict the co-strengthening effect of T’phase andη’phase in Al-Zn-Mg-Cu alloys,including the factors of the grain boundary,solid solution and precipitation. | Yan Zou Xiaodong Wu Songbai Tang Qianqian Zhu Hui Song Mingxing Guo Lingfei Cao | 2021 | Journal of Materials Science & Technology2021，，26： | 12 |
| 2 | Clustering behaviour in an Al–Mg–Si–Cu alloy during natural ageing and subsequent under-ageing显示文摘 | Lingfei Cao Paul A. Rometsch Malcolm J. Couper | 2013 | Materials Science & Engineering A2013，，： | 3 |
| 3 | Effect of pre-ageing and natural ageing on the paint bake response of alloy AA6181A显示文摘 | Lingfei Cao Paul A. Rometsch Malcolm J. Couper | 2013 | Materials Science & Engineering A2013，，： | 1 |
| 4 | Tailoring the microstructure and mechanical properties of the final Al-Mn foils by different intermediate annealing process显示文摘In this work, two different intermediate annealing processes, single-step annealing(SSA, 530?C/15 h)and two-step annealing(TSA, 450?C/5 h + 530?C/15 h), were used to tailor microstructure before coldrolling and annealing of the final twin-roll cast Al-Mn foils. The recrystallization behavior and mechanical properties during annealing of severely cold-rolled foils were systematically studied. Our results show that discontinuous recrystallization occurs in SSA-foils during annealing at 150–310?C, in contrast with continuous recrystallization in TSA-foils. The continuous recrystallization develops much finer grains(~1.35 μm) in the TSA-foils than those by discontinuous recrystallization in the SSA-foils(~14.7 μm). The texture components in cold-rolled TSA-foils hardly change(retained rolling-textures) after continuous recrystallization, while those in the cold-rolled SSA-foils mainly transform into a strong cube component{001} <100> after discontinuous recrystallization. Finally, a maximized elongation to fracture of ~23.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts, ~8.3%. The relationships between the microstructure and mechanical properties were discussed. | Li Huang Guangjie Huang Yunchang Xin Lingfei Cao Xiaodong Wu Zhihong Jia Qilei Li Qing Liu | 2017 | Journal of Materials Science & Technology2017，33，9： | 1 |
| 5 | Macroscopic assembled graphene nanofilms based room temperature ultrafast mid-infrared photodetectors显示文摘Graphene with linear energy dispersion and weak electron-phonon interaction is highly anticipated to harvest hot electrons in a broad wavelength range.However,the limited absorption and serious backscattering of hot-electrons result in inadequate quantum yields,especially in the mid-infrared range.Here,we report a macroscopic assembled graphene(nMAG)nanofilm/silicon heterojunction for ultrafast mid-infrared photodetection.The assembled Schottky diode works in 1.5-4.0μm at room temperature with fast response(20-30 ns,rising time,4 mm2 window)and high detectivity(1.61011 to 1.9109 Jones from 1.5 to 4.0μm)under the pulsed laser,outperforming single-layer-graphene/silicon photodetectors by 2-8 orders.These performances are attributed to the greatly enhanced photo-thermionic effect of electrons in nMAG due to its high light absorption(~40%),long carrier relaxation time(~20 ps),low work function(4.52 eV),and suppressed carrier number fluctuation.The nMAG provides a long-range platform to understand the hot-carrier dynamics in bulk 2D materials,leading to broadband and ultrafast MIR active imaging devices at room temperature. | Li Peng Lixiang Liu Sichao Du Srikrishna Chanakya Bodepudi Lingfei Li Wei Liu Runchen Lai Xiaoxue Cao Wenzhang Fang Yingjun Liu Xinyu Liu Jianhang Lv Muhammad Abid Junxue Liu Shengye Jin Kaifeng Wu Miao-Ling Lin Xin Cong Ping-Heng Tan Haiming Zhu Qihua Xiong Xiaomu Wang Weida Hu Xiangfeng Duan Bin Yu Zhen Xu Yang Xu Chao Gao | 2022 | InfoMat2022，4，6： | 1 |
| 6 | Synergetic effect of natural ageing and pre-stretching on the ageing behavior in Tʹ/ηʹ phase-strengthened Al-Zn-Mg-Cu alloys显示文摘Al-Zn-Mg-Cu alloys with different major strengthening precipitates are subjected to a novel combinatorial pre-treatment,including natural ageing and pre-stretching.The evolution of hardness and microstructure during the combinatorial pre-treatment and subsequent artificial ageing has been investigated.The results reveal that the growth rate of hardness in alloy B(Zn/Mg=10.0)is much higher than that of alloy A(Zn/Mg=1.5)due to the fast precipitation kinetics ofηphase compared with T phase.Both GP I zones and dislocations introduced by the combinatorial pre-treatment can act as heterogeneous nucleation sites for precipitation,resulting in more precipitates and higher hardness than pre-stretched alloys A and B.Dislocations distribute uniformly in combinatorial pre-treated alloys owing to the existence of GP I zones and dislocations,which promote the precipitation and refine the precipitate size.Moreover,these alloys with distinct pre-stretching(2%–10%)show similar precipitation behavior and peak hardness,and it indicates that the dislocation-induced precipitation will not be affected by the density of dislocations when plenty of GP I zones pre-exist. | Yan Zou Lingfei Cao Xiaodong Wu Songbai Tang Mingxing Guo | 2023 | Journal of Materials Science & Technology2023，，15： | 0 |
| 7 | Caudal dorsal artery generates hematopoietic stem and progenitor cells via the endothelial-to-hematopoietic transition in zebrafish显示文摘Zebrafish hematopoietic stem and progenitor cells(HSPCs) originate from the hemogenic endothelium of the ventral wall of the dorsal aorta(DA) through the endothelial-to-hematopoietic transition(EHT) from approximately 30 to 60 hours post fertilization(hpf). However, whether other artery sites can generate HSPCs de novo remains unclear. In this study, using live imaging and lineage tracing, we found that the caudal dorsal artery(CDA) in the caudal hematopoietic tissue directly gave rise to HSPCs through EHT.This process initiated from approximately 60 hpf and terminated at approximately 156 hpf. Compared with that in the DA, fewer EHT events were observed in the CDA. The EHT events in the DA and CDA were similarly regulated by Runx1 but differentially influenced by blood flow(i.e., the EHT frequency in CDA was affected to a lesser extent when circulation was compromised in the tnnt2a^(-/-)mutant). Therefore,the whole artery, including both DA and CDA, was endowed with the ability to produce HSPCs during a much longer time period. Coincidently, the lineage tracing results indicated that adult hematopoietic cells originated from the embryonic endothelium, and those produced later preferentially colonized the adult thymus. Collectively, our study revealed that the CDA serves as an additional source of hematopoiesis, and it shows similar but not identical properties with the DA. | YANDong Zhan Youkui Huang Jingying Chen Zigang Cao Jianbo He Jingjing Zhang Honghui Huang Hua Ruan Lingfei Luo Li Li | 2018 | Journal of Genetics and Genomics2018，45，6： | 0 |
| 8 | Development of augmented reality serious games with a vibrotactile feedback jacket显示文摘Background In the past few years,augmented reality(AR)has rapidly advanced and has been applied in different fields.One of the successful AR applications is the immersive and interactive serious games,which can be used for education and learning purposes.Methods In this project,a prototype of an AR serious game is developed and demonstrated.Gamers utilize a head-mounted device and a vibrotactile feedback jacket to explore and interact with the AR serious game.Fourteen vibration actuators are embedded in the vibrotactile feedback jacket to generate immersive AR experience.These vibration actuators are triggered in accordance with the designed game scripts.Various vibration patterns and intensity levels are synthesized in different game scenes.This article presents the details of the entire software development of the AR serious game,including game scripts,game scenes with AR effects design,signal processing flow,behavior design,and communication configuration.Graphics computations are processed using the graphics processing unit in the system.Results/Conclusions The performance of the AR serious game prototype is evaluated and analyzed.The computation loads and resource utilization of normal game scenes and heavy computation scenes are compared.With 14 vibration actuators placed at different body positions,various vibration patterns and intensity levels can be generated by the vibrotactile feedback jacket,providing different real-world feedback.The prototype of this AR serious game can be valuable in building large-scale AR or virtual reality educational and entertainment games.Possible future improvements of the proposed prototype are also discussed in this article. | Lingfei ZHU Qi CAO Yiyu CAI | 2020 | Virtual Reality & Intelligent Hardware2020，2，5： | 0 |
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