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SSRN 2022年

作者： Zhao, Ning Tang, Wei Zhang, Guofeng Li, Jijing Yang, Maogong Liu, Dexue School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China The National Key Laboratory for Precision Hot Forming of Metals Harbin Institute of Technology Harbin150001 China

Driven by the concept of high entropy alloy, Mg62.9Li30Al3Y1.3Gd1.5Sc1.3(at.%), a new multicomponent alloy is designed to solve the brittleness of lightweight high entropy alloys (LWHEAs). The microstructure and mechanical properties are also studied. As cast, the alloy consists of bcc solid solution phase with a large number of second phases and stands out for the low density (1.62 g/cm3) and the high compression strain (>45%). Then two typical deformation processes, cold rolling and equal channel angular pressing (ECAP), were applied to improve the strength. After cold rolling, the ultimate tensile strength improved from 107MPa to 145MPa and the ductility increased by two times;After ECAP processing, the ultimate tensile strength considerably increased to 211MPa without ductility loss. © 2022, The Authors. All rights reserved.

关键词： Equal channel angular pressing

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Electrospun poly(L-lactic acid)/gelatine membranes loaded with doxorubicin for effective suppression of glioblastoma cell growth in vitro and in vivo

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Regenerative Biomaterials 2021年第5期8卷 108-119页

作者： Boxun Liu Zhizhong Jin Haiyan Chen Lun Liang Yao Li Guo Wang Jing Zhang Tao Xu Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhen 518055China Department of Neurosurgery the First Hospital of China Medical UniversityShenyang 110122China Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South ChinaGuangzhou 510060China East China Institute of Digital Medical Engineering Shangrao 334000China Medprin Regenerative Medical Technologies Co. LtdGuangzhou 510663China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Electrospun membranes are attracting interest as a drug delivery system because of their material composition flexibility and versatile drug *** this study,the electrospun membrane was loaded with doxorubicin(DOX)via electrostatic adsorption for long-term drug *** loading process was optimized by varying temperature,time,drug concentration,pH and ionic strength of *** loading process did not impair the structural properties of the ***,we investigated the drug release kinetics using spectroscopic *** composite membranes released 22%of the adsorbed DOX over the first 48 h,followed by a slower and sustained release over 4 *** DOX release was sensitive to acidic solutions that the release rate at pH 6.0 was 1.27 times as that at pH *** DOX-loaded membranes were found to be cytotoxic to U-87 MG cells in vitro that decreased the cell viability from 82.92%to 25.49%from 24 to 72 h of *** membranes showed strong efficacy in suppressing tumour growth in vivo in glioblastoma-bearing mice that decreased the tumour volume by 77.33%compared with blank membrane-treated group on Day *** conclusion,we have developed an effective approach to load DOX within a clinically approved poly(L-lactic acid)/gelatine membrane for local and longterm delivery of DOX for the treatment of glioblastoma.

关键词： electrospinning electrostatic adsorption glioblastoma doxorubicin delivery poly(L-lactic acid)/gelatine

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Multi-Metal Substituted Fe-Based Prussian Blue as High-Capacity Cathode Material for Potassium Ion Batteries

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SSRN 2024年

作者： Yang, Shujie Feng, Xi Min, Xin Ma, Bin Liu, Yangai Mi, Ruiyu Wu, Xiaowen Wang, Wei Huang, Zhaohui Fang, Minghao China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Material Sciences and Technology China University of Geosciences Beijing100083 China Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming Qinghai University Xining810016 China State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing100083 China

Fe-based Prussian blue (FePB) has been widely studied as cathode materials of potassium ion batteries due to its three-dimensional open framework structure and large ion migration channels. In this study, the multi-metal (Co2+, Cu2+, Ni2+, Mn2+) doping on the rate and cycling properties of FePB were investigated. MnCoNiFePB cathode material shows better electrochemical performance, with the initial discharge capacity of 91.3 and 75.4 mAh g-1 (capacity retention is 56.7% after 100 cycles) at 20 and 100 mA g-1, respectively. These results inspire new ideas for the development and application of potassium ion battery electrode materials. © 2024, The Authors. All rights reserved.

关键词： Cathodes

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Predicting temperature-dependent ultimate strengths of body-centered-cubic(BCC)high-entropy alloys

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npj Computational Materials 2021年第1期7卷 1384-1393页

作者： B.Steingrimsson X.Fan X.Yang M.C.Gao Y.Zhang P.K.Liaw Imagars LLC 2062 Thorncroft Drive Suite 1214HillsboroOR 97124USA Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringBeijing 100049China National Energy Technology Laboratory 1450 Queen Ave.SWAlbanyOR 97321USA Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming Qinghai UniversityXining 810016China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China

This paper presents a bilinear log model,for predicting temperature-dependent ultimate strength of high-entropy alloys(HEAs)based on 21 HEA *** consider the break temperature,Tbreak,introduced in the model,an important parameter for design of materials with attractive high-temperature properties,one warranting inclusion in alloy *** reliable operation,the operating temperature of alloys may need to stay below *** introduce a technique of global optimization,one enabling concurrent optimization of model parameters over low-temperature and high-temperature ***,we suggest a general framework for joint optimization of alloy properties,capable of accounting for physics-based dependencies,and show how a special case can be formulated to address the identification of HEAs offering attractive ultimate *** advocate for the selection of an optimization technique suitable for the problem at hand and the data available,and for properly accounting for the underlying sources of variations.

关键词： alloys strength alloy

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Fabrication and characterization of Ti6Al4V by selective electron beam and laser hybrid melting 28

Fabrication and characterization of Ti6Al4V by selective ele...

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28th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2017

作者： Zhou, Bin Zhou, Jun Li, Hongxin Lin, Feng Department of Mechanical Engineering Tsinghua University Beijing100084 China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing China Key Laboratory for Advanced Materials Processing Technology Ministry of Education of China China

A hybrid process, which combines electron beam selective melting(EBSM) and selective laser melting(SLM), is proposed in this study. Laser is led into the vacuum chamber through the lens so that laser can be used to fabricate the metal powder at the same time with electron beam. In this study, Laser is used to pre-preheat the metal powder in order to preventing powder spreading and laser is also used to fabricate the contour of the parts both inside and outside. Electron beam is used to preheat the metal powder to the specified temperature and to fabricate the interior of the parts. It can be sure that through the hybrid process we can fabricate the parts with both better surface quality, higher precision and higher efficiency. Ti6Al4V samples were fabricated by selective electron beam and laser hybrid melting. The surface roughness of the parts was measured, the microstructures of the contour and interior were characterized using scanning electron microscopy (SEM). The results are that as-fabricated parts have better surface quality than the parts fabricated only using EBM process. Copyright © SFF *** rights reserved.

关键词： Ternary alloys

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Molecular Dynamics Simulation Analysis of the Indentation Hardness of Nano-Twinned Ni

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SSRN 2022年

作者： Zhang, Qin Zhou, Bingrao Wang, Wei Li, Rongbin Lv, Zhiqing Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao066004 China State Key Laboratory of Metastable Material Science and Technology Yanshan University Qinhuangdao066004 China Shanghai Engineering Research Center of Hot Manufacturing Shanghai Dianji University Shanghai200245 China

Molecular dynamics simulations were employed to perform the nanoindentation analysis of nanocrystalline nickel with different crystal structures (single-crystal, polycrystalline, and nano-twinned) and twin layer thicknesses under a spherical indenter. To understand the effects of crystal structure and twin spacing on nanoindentation responses, the crystal structure, dislocation, strain, indentation force, temperature, hardness, Young's modulus, and elastic recovery rate of the indentation region were analyzed. It was noticed that crystal structure and twin spacing had great influences on the mechanical properties and elastic recovery rate of the three types of nanocrystalline nickel. In the single-crystal structure, plastic deformation occurred mainly due to dislocations and slips. In the polycrystalline structure, plastic deformation occurred due to dislocation–grain boundary interactions, whereas in the nano-twinned structure, dislocation–grain boundary and dislocation–twin boundary interactions were the main reasons for plastic deformation. In the single-crystal structure, the hydrostatic pressure was distributed in a "V"-shape below the indenter. In the polycrystalline structure, atoms under the compressive stress were distributed below the indenter and at crystal boundaries. In the nano-twinned structure, atoms under the compressive stress were mainly distributed below the indenter. © 2022, The Authors. All rights reserved.

关键词： Nanoindentation

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Customized heat treatment process enabled excellent mechanical properties in wire arc additively manufactured Mg-RE-Zn-Zr alloys

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International Journal of Extreme Manufacturing 2024年第4期6卷 276-289页

作者： Dong Ma Chunjie Xu Shang Sui Yuanshen Qi Can Guo Zhongming Zhang Jun Tian Fanhong Zeng Sergei Remennik Dan Shechtman School of Materials Science and Engineering Xi'an University of TechnologyXi'anShaanxi 710048People's Republic of China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an 710048People's Republic of China Xi'an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi'anShaanxi 710048People's Republic of China Department of Materials Science and Engineering and Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyShantou 515063People's Republic of China MGM Nobel Prize New Materials Co. LtdTongchuan 727100People's Republic of China Department of Materials Science and Engineering Technion-Israel Institute of TechnologyHaifa 32000Israel Center for Nanoscience&Nanotechnology Hebrew University of JerusalemEdmond J.Safra CampusJerusalem 91904Israel

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials,especially for alloys with complex phase constituents and heterogenous ***,the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment ***,we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys,and a wire arc additively manufactured(WAAM)Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility *** this method,the optimal microstructures(fine grain,controllable amount of long period stacking ordered(LPSO)structure and nano-scaleβ'precipitates)and the corresponding customized heat treatment processes(520°C/30 min+200°C/48 h)were obtained to achieve a good combination of a high strength of 364 MPa and a considerable elongation of 6.2%,which surpassed those of other state-of-the-art WAAM-processed Mg ***,we evidenced that the favorable effect of the undeformed LPSO structures on the mechanical properties was emphasized only when the nano-scaleβ'precipitates were *** is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment processes for additively manufactured materials.

关键词： wire arc additive manufacturing heat treatment Mg-RE-Zn-Zr alloys LPSO structure mechanical properties

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δ-phase precipitation regularity of cold-rolled fine-grained GH4169 alloy plate and its effect on mechanical properties

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Transactions of Nonferrous Metals Society of China 2020年第12期30卷 3287-3295页

作者： Hao XUE Jing-qi ZHAO Yong-kang LIU Chun-xiang ZHANG Jun-ting LUO Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

Cold rolling and heat-treatment were used for the grain refinement of GH4169 superalloy *** effects of cold rolling reduction ratio and heat-treatment time on the precipitatedδphase,and the effects ofδ-phase content and morphology on the mechanical properties of the GH4169 alloy plates,are *** results demonstrate that coldrolling can promote the precipitation of theδphase and its transformation from theδ-Ni3Nb phase to theδ-NbNi4 *** comprehensive properties of the alloy are better when the heat treatment time is 1 h,with 132 MPa increase in the tensile strength and only 2.9%decrease in the elongation relative to those of the original *** mechanical properties of the alloy are shown to change greatly with the change in theδ-phase morphology.

关键词： fine-grained GH4169 alloy cold rolling δphase mechanical properties

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Hot Deformation Behavior and Resultant Microstructural Evolution of Dilute Mg-Bi-Sn-Mn Alloy During Hot Compression

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SSRN 2023年

作者： You, Zhi-Yong Cheng, Wei-Li Luo, Lin Yu, Hui Wang, Li-Fei Li, Hang Cui, Ze-Qin Wang, Jin-Hui School of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China School of Materials Science and Engineering Hebei University of Technology Tianjin300132 China Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming Qinghai University Xining810016 China Key Laboratory of Interface Science and Engineering in Advanced Materials

The current study systematically investigates the hot deformation behavior and dynamic recrystallization (DRX) mechanism of the solution-treated Mg-0.5Bi-0.5Sn-0.5Mn (BTM000) alloy during hot compression. The results show that the established optimal constitutive model accurately predicts the hot deformation behavior of the BTM000 alloy. The stable zones of hot deformation, exhibiting the highest power dissipation efficiency, are predominantly observed within the medium temperature range of 210–290 °C and high strain rate range of 0.37‒1 s–1. The calculated value of n is 7.96, suggesting that the prevailing deformation mechanism is cross-slip, which aligns with the observations of TEM analysis. At a strain rate of 0.001 s–1, the dominant deformation mechanism is pyramidal slip. However, as the strain rate is increased to 1 s–1, the deformation mode transitions from being dominated by basal slip to a synergy between basal slip and the pyramidal slip, with this transition occurring over the temperature range of 175 °C to 325 °C. Notably, at low temperatures and low strain rates (175 °C/0.001 s−1), the continuous dynamic recrystallization (CDRX) mechanism is dominant. However, with increasing strain rates or deformation temperatures, discontinuous dynamic recrystallization (DDRX) mechanism occurs in addition to CDRX. Furthermore, the driving forces behind various DRX mechanisms are explored through quasi-situ kernel average misorientation (KAM) analysis. © 2023, The Authors. All rights reserved.

关键词： Dynamic recrystallization

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Experimental Investigation on Micro Deep Drawing of Stainless Steel Foils with Different Microstructural Characteristics

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Chinese Journal of Mechanical Engineering 2021年第2期34卷 179-189页

作者： Jingwei Zhao Tao Wang Fanghui Jia Zhou Li Cunlong Zhou Qingxue Huang Zhengyi Jiang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan 030024China TYUT-UOW Joint Research Center Taiyuan University of TechnologyTaiyuan 030024China TYUT-UOW Joint Research Center University of WollongongWollongongNSW 2522Australia School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongNSW 2522Australia Shanxi Provincial Key Laboratory on Metallurgical Device Design and Theory Taiyuan University of Science and TechnologyTaiyuan 030024China

In the present work,austenitic stainless steel(ASS)304 foils with a thickness of 50μm were first annealed at temperatures ranging from 700 to 1100℃for 1 h to obtain different microstructural *** the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing(MDD)were studied,and the mechanism involved was *** results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using *** wrinkling problem occurs on the drawn cup,and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700℃.At annealing temperatures of 900 and 950℃,the drawn cups are both characterized with very few wrinkles,and the distribution of height profile,symmetry and mouth thickness are uniform on the mouths of the drawn *** wrinkling becomes increasingly significant with a further increase of annealing temperature from 950 to 1100℃.The optimal annealing temperatures obtained in this study are 900 and 950℃for reducing the generation of wrinkling,and therefore improving the quality of drawn *** non-optimized microstructure,the distribution of the compressive stress in the circumferential direction of the drawn foils becomes inhomogeneous,which is thought to be the cause of the occurrence of localized deformation till wrinkling during MDD.

关键词： Microforming Micro deep drawing Stainless steel foils Wrinkling Annealing Microstructure

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