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| 1 | Phase transition and heterogeneous strengthening mechanism in CoCrFeNiMn high-entropy alloy fabricated by laser-engineered net shaping via annealing at intermediate-temperature显示文摘High-entropy alloys(HEAs)have attracted tremendous attention owing to their controllable mechanical properties,whereas additive manufacturing(AM)is an efficient and flexible processing route for novel materials design.However,a profound appraisal of the fundamental material physics behind the strengthening of AM-printed HEAs upon low/intermediate-temperature annealing is essential.In this work,Co CrFe Ni Mn HEAs have been prepared using laser-engineered net shaping(LENS)and subsequently annealed at different temperatures.The Co Cr Fe Ni Mn HEA annealed at intermediate-temperature(873 K)exhibits a strong strain hardening capability,resulting in ultimate strength of 725 MPa and plasticity of 22%.A ternary heterogeneous strengthening mechanism is proposed to explain this phenomenon,in which equiaxed grains,columnar grains,andσprecipitates play different roles during tensile deformation.The resultant excellent strength and ductility can be ascribed to the heterostructure-induced mismatch.The equiaxed grains provide adequate grain boundaries(GBs),which induce dislocation plugging-up and entanglement;the columnar grains induce the onset and arrest of the dislocations for plastic deformation;and theσprecipitates hinder the movement of slip dislocations.The results provide new insights into overcoming the strength-ductility trade-off of LENS-printed HEAs with complex geometries. | Yunjian Bai Heng Jiang Kuo Yan Maohui Li Yanpeng Wei Kun Zhang Bingchen Wei | 2021 | Journal of Materials Science & Technology2021，，33： | 3 |
| 2 | Microstructural evolution and energetic characteristics of TiZrHfTa_(0.7)W_(0.3)high-entropy alloy under high strain rates and its application in high-velocity penetration显示文摘Energetic structural materials(ESMs)integrated a high energy density and rapid energy release with the ability to serve as structural materials.Here,a novel triple-phase TiZrHfTa_(0.7)W_(0.3)high-entropy alloy(HEA)was fabricated and investigated as a potential ESM.A hierarchical microstructure was obtained with a main metastable body-centered-cubic(BCC)matrix with distributed Ta-W-rich BCC precipitates of various sizes and interwoven hexagonal close-packed(HCP)lamellar nano-plates.The compressive me-chanical properties were tested across a range of strain rates and demonstrated a brittle-to-ductile tran-sition as the strain rate increased while maintaining a high ultimate strength of approximately 2.5 GPa.This was due to the phase transformation from metastable matrix BCC to HCP structures.In addition,during the dynamic deformation,metal combustion originating from the failure surface was observed.Furthermore,the composition of the fragments was studied,and the results indicated that the addition of tungsten promoted combustion.Finally,the potential application of this HEA was evaluated by high-velocity penetration tests,and the results were compared to other typical structural materials for pene-trators and bullets.A comparison was conducted by assessing the geometries of the penetration channel employing two dimensionless parameters normalized by the projectile size,representing longitudinal and lateral damage,respectively.The normalized depth of the TiZrHfTa_(0.7)W_(0.3)HEA projectile was comparable to those of the other investigated materials,but the normalized diameter was the largest,showing an excellent ability to deliver lateral damage. | Weiqi Tang Kun Zhang Tianyu Chen Qiu Wang Bingchen Wei | 2023 | Journal of Materials Science & Technology2023，，1： | 3 |
| 3 | Finite element model updating in struc- tural dynamics by using the response surface method 显示文摘 | Wei Xinren Hua Bingchen | 2010 | Engineer- ing Structures2010，32，4： | 1 |
| 4 | Pt/3D-graphene/FTO electrodes: Electrochemical preparation and their enhanced electrocatalytic activity显示文摘 | Shaolin Yang Yongwei Huang Wei Zhu Bingchen Deng Hong Wang Zihan Zhang Pengfei Bao Guanzhong Wang | 2014 | International Journal of Hydrogen Energy2014，，27： | 1 |
| 5 | Domain structure of hard magnetic NdAlFeCo bulk metallic glass显示文摘Magnetic domain structure of hard magnetic Nd60Al10Fe20Co10 bulk metallic glass (BMG) has been studied by using magnetic force microscopy. In the magnetic force images it is shown that the exchange interaction type magnetic domains with a period of about 360 nm do exist in the BMG, which is believed to be associated with the appearance of hard-magnetic properties in this system. As the scale of the magnetic domain is much larger than the size of the short-range ordered atomic clusters existing in the BMG, it is believed that the large areas of magnetic contrast are actually a collection of a group of clusters aligned in parallel by strong exchange coupling interaction. After fully crystallization, the BMG exhibits paramagnetism. No obvious magnetic contrast is observed in the magnetic force images of fully crystallized samples, except for a small quantity of ferromagnetic crystalline phase with low coercivity and an average size of 900 nm. | WEI Bingchen WANG Weihua PAN Mingxiang HAN Baoshan ZHANG Zhenrong HU Wenrui | 2001 | Chinese Science Bulletin2001，46，19： | 1 |
| 6 | Deformation behavior of Fe-based bulk metallic glass during nanoindentation显示文摘Fe-based bulk metallic glasses (BMGs) normally exhibit super high strength but significant brittleness at ambient temperature. Therefore,it is difficult to investigate the plastic deformation behavior and mechanism in these alloys through conven-tional tensile and compressive tests due to lack of distinct macroscopic plastic strain. In this work,the deformation behavior of Fe52Cr15Mo9Er3C15B6 BMG was in-vestigated through instrumented nanoindentation and uniaxial compressive tests. The results show that serrated flow,the typical plastic deformation feature of BMGs,could not be found in as-cast and partially crystallized samples during nanoinden-tation. In addition,the deformation behavior and mechanical properties of the alloy are insensitive to the applied loading rate. The mechanism for the appearance of the peculiar deformation behavior in the Fe-based BMG is discussed in terms of the temporal and spatial characteristics of shear banding during nanoindentation. | LI Lei LIU Yuan ZHANG TaiHua GU JianSheng WEI BingChen | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，4： | 1 |
| 7 | Microstructure and mechanical properties of a novel Zr-based bulk metallic glass composite显示文摘Zr48.5Cu46.5Al5 bulk metallic glass (BMG) com- posites with diameters of 3 and 4 mm were prepared through suction casting in an arc melting furnace by modulating the alloy composition around the monothetic BMG composition of the high glass forming ability. Microstructural charac- terization reveals that the composites contain micron-sized CuZr phase with martensite structure, as well as nano-sized Zr2Cu crystalline particles and Cu10Zr7 plate-like phase em- bedded in an amorphous matrix. Room temperature com- pression tests showed that the composites exhibited signifi- cant strain hardening and obvious plastic strain of 7.7% for 3 mm and 6.4% for 4 mm diameter samples, respectively. | SUN Yufeng WANG Yuren GUO Jian WEI Bingchen LI Weihuo | 2005 | Chinese Science Bulletin2005，50，24： | 1 |
| 8 | Preparation of Cu-based Bulk Metallic Glass Matrix Composites显示文摘在 situ 包含的金属性的玻璃(BMG ) 矩阵 composites 形成了的 Cu_(47 )Ti_(34 )Zr_(11 ) Ni_8 体积 TiC 粒子和 delta-TiCu 树突阶段被铜开发模子演员组。composites 的热稳定性和微观结构被调查。房间温度耐压试验表明合成样品展出更高的破裂力量和 0.2 percent-0.5 百分比的不同塑料紧张,把 Ti_(34 ) 与 correspondingCu_(47 ) 的作比较 Zr_(11 ) Ni_8 整体的 BMG。 | Yufeng SUN Yuren WANG Bingchen WEI Weihuo LI | 2006 | Journal of Materials Science & Technology2006，22，1： | 1 |
| 9 | Critical serrated flow features during nanoindentation in La-based bulk metallic glasses显示文摘La57.6Al17.5(Cu,Ni)24.9 and La64Al14(Cu,Ni)22 bulk metallic glasses (BMGs) were prepared by copper-mould casting method. Plastic deformation behavior of the two BMGs at various loading rates was studied by nanoindentation. The results showed that the La57.6Al17.5(Cu,Ni)24.9 BMG with a glass transition temperature of 423 K exhibited prominent serrated flow at low loading rates, whereas less pronounced serrated flow at high rates during nanoindentation. In contrast, the La64Al14(Cu,Ni)22 BMG with a glass transition temperature of 401 K exhibited prominent serrated flow at high loading rates. The different rate dependency of serrated flow in the two La-based BMGs is related to the different glass transition temperature, and consequently the degree of viscous flow during indentation at room temperature. A smoother flow occurs in the alloy with relatively lower glass transition temperature, due to the relaxation of stress concentration. | Wei Peng1), Taihua Zhang2), Yuan Liu1), Lei Li1), and Bingchen Wei1) 1) National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China 2) State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China | 2007 | International Journal of Minerals,Metallurgy and Materials2007，15，S1： | 0 |
| 10 | A SAR imaging method based on generalized minimax-concave penalty显示文摘Dear editor,Sparse signal processing offers a framework for synthetic aperture radar(SAR)imaging [1,2].As an efficient tool in sparse signal processing,L1 minimization is often used in the reconstruction of SAR images.When implemented in SAR imaging [3-5],L1 minimization offers significant improvement in the properties by suppressing the sidelobes and clutter. | Zhonghao WEI Bingchen ZHANG Yirong WU | 2019 | Science China(Information Sciences)2019，62，2： | 0 |
| 11 | An Online Website Fingerprinting Defense Based on the Non-Targeted Adversarial Patch显示文摘Website Fingerprinting(WF)attacks can extract side channel information from encrypted traffic to form a fingerprint that identifies the victim’s destination website,even if traffic is sophisticatedly anonymized by Tor.Many offline defenses have been proposed and claimed to have achieved good effectiveness.However,such work is more of a theoretical optimization study than a technology that can be applied to real-time traffic in the practical scenario.Because defenders generate optimized defense schemes only if the complete traffic traces are obtained.The practicality and effectiveness are doubtful.In this paper,we provide an in-depth analysis of the difficulties faced in porting existing offline defenses to the online scenarios.And then the online WF defense based on the non-targeted adversarial patch is proposed.To reduce the overhead,we use the Gradient-weighted Class Activation Mapping(Grad-CAM)algorithm to identify critical segments that have high contribution to the classification.In addition,we optimize the adversarial patch generation process by splitting patches and limiting the values,so that the pre-trained patches can be injected and discarded in real-time traffic.Extensive experiments are carried out to evaluate the effectiveness of our defense.When bandwidth overhead is set to 20%,the accuracies of the two state-of-the-art attacks,DF and Var-CNN,drop to 10.83%and 15.49%,respectively.Furthermore,we implement the real-time patch traffic injection based on WFPadTools framework in the online scenario,and achieve a defense accuracy of 95.50%with 12.57%time overhead. | Xiaodan Gu Bingchen Song Wei Lan Ming Yang | 2023 | Tsinghua Science and Technology2023，28，6： | 0 |
| 12 | Deformation behavior during nanoindentation in Ce-based bulk metallic glasses显示文摘The deformation behavior and the ef- fect of the loading rate on the plastic deformation in Ce-based bulk metallic glasses (BMGs) were inves- tigated through nanoindentation tests. The results showed that the loading rate dependence of plastic deformation during nanoindentation measurements in the Ce-based BMGs is quite unique in contrast to that of other BMG alloys. The load-displacement (P-h) curves of Ce60Al15Cu10Ni15 BMG exhibit a homoge- neous plastic deformation at low loading rates, and a prominent serrated flow at high strain rates, whereas, the P-h curves of Ce65Al10Cu10Ni10Nb5 exhibit ho- mogenous plastic deformation at all studied loading rates. The room temperature creep behavior could clearly be observed in these two alloys. The mecha- nism of the unique plastic deformation feature in the Ce-based BMGs was studied. | ZHANG Lingchen XING Dongmei ZHANG Taihua WEI Bingchen LI Weihuo WANG Yuren | 2006 | Chinese Science Bulletin2006，51，13： | 0 |
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