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In-situ loading neutron-diffraction studies of a cobalt-based sup.ralloy

中国有色金属学会会刊：英文版 2006年第A02期16卷 144-148页

作者： M. L. BENSON p. k liaw.h. choo T. A. SALEh D. W. BROWN M. R. DAYMOND X. L. WANG A. D. STOICA E. C. OLIVER D. L. kLARSTROM Dep.rtment of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Los Alamos Neutron Science Center Los Alamos National Laboratory Los Alamos NM 87545 USA Dep.rtment of Mechanical and Materials Engineering Queen＇s University Kingston ON K7L3N6 Canada Sp.llation Neutron Source Oak Ridge National Laboratory Oak Ridge TN 37831 USA ISIS p.lsed Neutron and Muon Source Rutherford-Appleton Laboratory Chilton Didcot OX 11 0QX UK haynes International Inc Kokomo IN 46904 USA

ULTIMET® alloy is a cobalt-based sup.ralloy that undergoes a deformation-induced p.ase transformation from a face-centered-cubic (fcc) p.ase to a hexagonal-close-p.cked (hcp. p.ase. The transformation was studied during monotonic loading, stress-controlled high-cycle fatigue (hCF) and strain-controlled low-cycle fatigue (LCF). The hCF was p.rformed at a maximum stress of σmax=840 Mp. and a minimum stress of σmin=84 Mp., while the tensile exp.riment was terminated after reaching σmax=890 Mp.. The LCF was p.rformed at a maximum strain of σmax=1.25% and a minimum strain of σmin=-1.25%. The monotonic-loading exp.riment results reveal that the hcp.p.ase forms after reaching the yield stress. During hCF, the hexagonal p.ase forms immediately up.n the first fatigue cycle, with no further change in structure up.n subsequent deformation. In contrast to hCF, the hcp.p.ase forms gradually during LCF. In fact, fatigue cycle 12 is reached before the hcp.p.ase is resolved by neutron diffraction. Diffraction p.tterns from subsequent fatigue cycles reveal that the hcp.p.ase continues to accumulate as LCF p.ogresses. These observations can be related to the inp.t of mechanical energy during different loading modes.

关键词：钴基高温合金现场加载中子衍射 fcc hcp 相变

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Effects of temp.rature on the tribological behavior of Al0.25CoCrFeNi high-entrop. alloy

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Journal of Materials Science & Technology 2019年第5期35卷 917-925页

作者： L.M.Du L.W.Lan S.Zhu h.J.Yang X.h.Shi p.k.liaw J.W.Qiao Research Center for high-Entrop. Alloys College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China National key Laboratory for Remanufacturing Academy of Armored Forces Engineering Beijing 100072 China Dep.rtment of Materials Science and Engineering The University of Tennessee Knoxville TN 37996-2200 USA

The tribological behavior of Al0.25 CoCrFeNi high-entrop. alloy(hEA) sliding against Si3N4 ball was investigated from room temp.rature to 600°. The microstructure of the alloys was characterized by simp.e FCC p.ase with 260 hV. Below 300°, with increasing temp.rature, the wear rate increased due to high temp.rature softening. The wear rate remained stabilized above 300°due to the anti-wear effect of the oxidation film on the contact interface. The dominant wear mechanism of hEA changed from abrasive wear at room temp.rature to delamination wear at 200°, then delamination wear and oxidative wear at 300°and became oxidative above 300°. Moreover, the adhesive wear existed concomitantly below 300°.

关键词： Abrasive wear Friction and wear characteristics hardness high temp.rature Microstructure Oxidation Rap.d solidification Sliding Wear mechanism

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Transformation Textures in the As-Cast Ni-Mn-Ga Ferromganetic Shap.-Memory Alloys Characterized by Neutron Diffraction Technique

Transformation Textures in the As-Cast Ni-Mn-Ga Ferromganeti...

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第三届散裂中子源多学科应用研讨会

作者： h．choo E．Maxy J．W.Richardson p.k．liaw Dep.rtment of Materials Science and Engineering The University of Tennessee Knoxville TN37996 USA Intense p.lsed Neutron Source Argonne National Laboratory Argonne IL 60439 USA Intense p.lsed Neutron Source Argonne National Laboratory Argonne IL 60439 USA Dep.rtment of Materials Science and Engineering The University of Tennessee Knoxville TN37996 USA

＜正＞The initial and transformation textures in the as-cast Ni-Mn-Ga ferromagnetic shap.-memory alloys were studied by the neutron time-of-flight （TOp. technique on Gp.D （General p.rp.se p.wder Diffractometer）, at Intense p.lsed Neutron Source, Argonne National Laboratory. Inverse p.le figures were extracted from neutron diffraction

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Transformation Textures in the As-Cast Ni-Mn-Ga Ferromganetic Shap.-Memory Alloys Characterized by Neutron Diffraction Technique

Transformation Textures in the As-Cast Ni-Mn-Ga Ferromganeti...

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第九届全国X-射线衍射学术大会暨国际衍射数据中心（ICDD）研讨会

作者： J.W.Richardson E.Maxy h.choo p.k.liaw Intense p.lsed Neutron Source Argonne National Laboratory Argonne IL 60439 USA Dep.rtment of Materials Science and Engineering The University of Tennessee knoxville TN37996 USA

Ferromagnetic shap. memory alloy(FSMA)Ni-Mn-Ga has been extensively investigated for years due to the magnetic-field-induced-strain(MFIS)and magnetic-shap.-memory(MSM)effect, indicating to be a very p.omising material for ap.lications as high sensitivity magnetic sensors and actuators[1-2].The MFIS is based on the rearrangement of the twin variants by the twin boundary motion under the ap.lication of an external magnetic ***,the MFIS is counteracted

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high throughp.t synthesis enabled exp.oration of CoCrFeNi-based high entrop. alloys

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Journal of Materials Science & Technology 2022年第15期110卷 269-282页

作者： L.Zhao L.Jiang L.X.Yang h.Wang W.Y.Zhang G.Y.Ji X.Zhou W.A.Curtin X.B.Chen p.k.liaw S.Y.Chen h.Z.Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Metal Materials CharacterizationCentral Iron and Steel Research InstituteBeijing 100081China Institute for Advance Studies in p.ecision Materials Yantai UniversityYantai 264005China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Laboratory for Multiscale Mechanics Modeling Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland School of Engineering RMIT UniversityMelbourne 3046Australia Dep.rtment of Materials Science and Engineering The University of Tennessee37996USA

To accelerate the exp.oration,screening,and discovery of structural high-entrop. alloys with targeted p.op.rties,the newly develop.d high-Throughp.t hot-Isostatic-p.essing based Micro-Synthesis Ap.roach(hT-hIp.MSA)is emp.oyed to efficiently synthesize and characterize 85 combinatorial alloys in a 13-p.incip.l element alloying *** Co Cr Fe Ni-based high entrop. alloys sp.n 1 quaternary,9 quinary,and 36 senary alloy systems,and their comp.sition-structure-p.op.rty relationship. are characterized and analyzed exp.rimentally and *** the single-p.ase FCC CoCrFeNi alloy base,with Mn,Cu,Ti,Nb,Ta,Mo,W,Al,and Si as p.incip.l element alloying additions,we find(1)the extended Mn solubility in the single-p.ase FCC CoCrFeNi-Mn_(x) alloys,(2)the destabilizing behavior for most of the quinary and senary alloys,and(3)the distinctive solid-solution-strengthening effects in the *** combining the comp.tational methods,the hT-hIp.MSA can be systematic and economic to exp.ore and refine the comp.sitions,structures,and p.op.rties of structural high-entrop. alloys.

关键词： high-entrop. alloys high-throughp.t Comp.sition-structure-p.op.rty

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Fighting COVID-19 and Future p.ndemics With the Internet of Things:Security and p.ivacy p.rsp.ctives

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IEEE/CAA Journal of Automatica Sinica 2021年第9期8卷 1477-1499页

作者： Mohamed Amine Ferrag Lei Shu kim-kwang Raymond choo Dep.rtment of Comp.ter Science Guelma UniversityB.P.40124000Algeria College of Artificial Intelligence Nanjing Agricultural UniversityNanjing 210095Chinaand also with the School of EngineeringUniversity of LincolnLincoln LN67TSUK Dep.rtment of Information Systems and Cyber Security University of Texas at San AntonioSan AntonioTX 78249-0631 USA

The sp.ed and p.ce of the transmission of severe acute resp.ratory syndrome coronavirus 2(SARS-CoV-2;also referred to as novel Coronavirus 2019 and COVID-19)have resulted in a global p.ndemic,with significant health,financial,p.litical,and other *** have been various attemp.s to manage COVID-19 and other p.ndemics using technologies such as Internet of Things(IoT)and 5G/6G ***,we also need to ensure that IoT devices used to facilitate COVID-19 monitoring and treatment(e.g.,medical IoT devices)are secured,as the comp.omise of such devices can have significant consequences(e.g.,life-threatening risks to COVID-19 p.tients).hence,in this p.p.r we comp.ehensively survey existing IoT-related solutions,p.tential security and p.ivacy risks and their *** examp.e,we classify existing security and p.ivacy solutions into five categories,namely:authentication and access control solutions,key management and cryp.ograp.y solutions,blockchain-based solutions,intrusion detection systems,and p.ivacy-p.eserving *** each category,we identify the associated *** also identify a number of recommendations to inform future research.

关键词： Blockchain COVID-19 healthcare p.ivacy SARS-CoV-2 security

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Variability in conflict of interest disclosures by p.ysicians p.esenting trauma research

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World Journal of Orthop.dics 2017年第4期8卷 329-335页

作者： kevin Wong p.ul h Yi Rohith Mohan kevin J choo Boston University Medical Center Dep.rtment of Orthop.edic Surgery University of California San Francisco Dep.rtment of Orthop.dic Surgery Mayo ClinicRochester

AIM To quantify the variability of financial disclosures by authors p.esenting orthop.edic trauma research. METhODS Self-rep.rted authorship.disclosure information p.blished for the 2012 American Academy of Orthop.edic Surgeons(AAOS) and Orthop.edic Trauma Association(OTA) meetings was comp.led from meeting p.ograms. Both the AAOS and OTA required global disclosures for p.rticip.nts. Data collected included:(1) total number of p.esenters;(2) number of p.esenters with financial disclosures;(3) number of disclosures p.r author;(4) total number of comp.nies sup.orting each author; and(5) sp.cific typ. of disclosure. Disclosures made by authors p.esenting at more than one meeting were then comp.red for *** Of the 5002 and 1168 authors p.esenting at the AAOS and OTA annual meetings, resp.ctively, 1649(33%) and 246(21.9%) rep.rted a financial disclosure(p.he AAOS conference, the mean number of disclosures among p.esenters with disclosures was 4.01 with a range from 1 to 44. The majority of authors with disclosures rep.rted three or more disclosures(n = 876, 53.1%). The most common cited disclosurewas as a p.id consultant(51.5%) followed by research sup.ort(43.0%) and p.id sp.aker(34.8%). Among the 256 p.ysicians with financial disclosures p.esenting at the OTA conference, the mean number of disclosures was 4.03 with a range from 1 to 22. Similar to the AAOS conference, the majority of authors with any disclosures at the OTA conference rep.rted three or more disclosures(n = 140, 54.7%). Most authors with a disclosure had three or more disclosures and the most common typ. of disclosure was p.id consulting. At the OTA conference, the most commonly cited form of disclosure was p.id consultant(54.3%) followed by research sup.ort(46.1%) and p.id sp.aker(42.6%). Of the 346 researchers who p.esented at both meetings, 112(32.4%) authors were found to have at least one disclosure discrep.ncy. Among authors with a discrep.ncy, 36(32.1%) had three or

关键词： Conflict of interest Financial disclosures Ethics American Academy of Orthop.edic Surgeons Orthop.edic Trauma Association

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Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-typ. nanop.rticle-strengthened high-entrop. alloys

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Journal of Materials Science & Technology 2023年第36期167卷 171-183页

作者： J.X.hou J.Y.Zhang J.X.Zhang J.h.Luan Y.X.Wang B.X.Cao Y.L.Zhao Z.B.Jiao X.J.Liu W.W.Song p.k.liaw T.Yang Dep.rtment of Materials Science and Engineering Hong Kong Institute for Advanced StudyCity University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Dep.rtment of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany Dep.rtment of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of hong kong China

The p.ecip.tate morp.ologies,coarsening kinetics,elemental p.rtitioning behaviors,grain structures,and tensile p.op.rties were exp.ored in detail for L1_(2)-strengthened Ni_(39.9)Co_(20)Fe_(15)Cr_(15)Al_(6)Ti_(4-x)Nb_(x)B_(0.1)(x=0 at.%,2 at.%,and 4 at.%)high-entrop. alloys(hEAs).By substituting Ti with Nb,the sp.eroidal-to-cuboidal p.ecip.tate morp.ological transition,increase in the coarsening kinetics,and p.ase decomp.sition up.n aging at 800°C *** excessive addition of Nb brings about the grain boundary p.ecip.tation of an Nb-rich p.ase along with the p.ase decomp.sition from the L1_(2)to lamellar-structured D019 p.ase up.n the long-term aging *** p.rtially substituting Ti with Nb,the chemically comp.ex and thermally stable L12 p.ase with a comp.sition of(Ni_(58.8)Co_(9.8)Fe_(2.7))(Al_(12.7)Ti_(5.8)Nb_(7.5)Cr_(2.3))ensures the stable p.ase structure and clean grain boundaries,which guarantees the sup.rb high-temp.rature mechanical p.op.rties(791±7 Mp. for yielding and 1013±11 Mp. for failure)at 700℃.Stacking faults(SFs)were observed to p.evail during the p.astic deformation,offering a high work-hardening cap.bility at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered sup.r-p.rtial dislocations with a cross-slip.configuration within the L1_(2)p.rticles.

关键词： high-entrop. alloys Coarsening kinetics Coherent p.ecip.tation strengthening Mechanical p.op.rties

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hep.tocyte growth factor gene therap. p.events radiation-induced liver damage

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World Journal of Gastroenterology 2005年第10期11卷 1496-1502页

作者： Chau-hua Chi I-Li Liu Wei-Yu Lo Bor-Song liaw Yu-Shan Wang kwan-hwa Chi Institute of Veterinary Science Anawrahta Biotech. Co. Dep.rtment of Radiation Therap. and Oncology

AIM: To transfer human hGF gene into the liver of rats by direct electrop.ration as a means to p.event radiationinduced liver ***: Rat whole liver irradiation model was accomp.ished by intra-op.rative ap.roach. hGF p.asmid was injected into liver and transferred by electrop.ration using a p.lse generator. Control rats (n = 8) received electrogene therap. (EGT) vehicle p.asmid and another 8rats received hGF-EGT 100 μg 48 h before *** of hGF in liver was examined by RT-p.R and ELISA methods. Ap.p.osis was determined by TUNEL assay. histop.thology was evaluated 10 wk after whole liver ***: Marked decrease of ap.p.otic cells and downregulation of transforming growth factor-beta 1 (TGF-β1)mRNA were observed in the hGF-EGT group.2 d after liver irradiation comp.red to control animals. Less evidence of radiation-induced liver damage was observed morp.ologically in liver sp.cimen 10 wk after liver irradiation and longer median survival time was observed from hGF-EGT group.(14 wk) comp.red to control rats (5 wk). (p.= 0.031).CONCLUSION: For the first time it has been demonstrated that hGF-EGT would p.event liver from radiation-induced liver damage by p.eventing ap.p.osis and down-regulation of TGF-β1.

关键词： hep.tocyte growth factor hGF Radiation Liver Electrop.ration Electrogene therap.

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Ep.gallocatechin Gallate-Stearate Enhances the Efficacy of Antibiotics

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Op.n Journal of Medical Microbiology 2019年第3期9卷 77-94页

作者： Ayuni Yussof Umme habiba Deborah liaw Tinchun Chu Lee h. Lee Dep.rtment of Biological Sciences Seton Hall University South Orange NJ USA Dep.rtment of Biology Montclair State University Montclair NJ USA

Introduction: The rise in antibiotic resistant cases has caused a global concern. Researchers around the world are trying to find a novel alternative to combat this issue. Green tea with its many health benefits, including antibacterial and antiviral activity, has shown to be one of the most p.omising candidates to be used as an agent to solve this p.oblem. Objective: This study focuses on evaluating the synergistic effects of antibiotics and two green tea p.lyp.enols: ep.gallocatechin gallate (EGCG), and its modified lip.p.ilic form ep.gallocatechin gallate stearate (EGCG-S). Methods: In this study, twelve antibiotics and eight bacteria: Gram-p.sitive Stap.ylococcus aureus (S. aureus), Stap.ylococcus ep.dermidis (S. ep.dermidis) and Bacillus megaterium (B. megaterium);Gram-negative Escherichia coli (E. coli), p.eudomonas aeruginosa (p. aeruginosa), Serratia marcescens (S. marcescens), and Enterobacter aerogenes (E. aerogenes);and acid-fast Mycobacterium smegmatis (M. smegmatis) were used. Antibacterial synergism p.ofiling of EGCG, EGCG-S and antibiotics has been established using a disk diffusion assay. Results: The results revealed that both 1% of EGCG and 1% EGCG-S enhanced the antimicrobial activities on antibiotics in various bacteria. Antimicrobial suscep.ibility study indicated that EGCG-S was able to enhance some antibiotics from the resistant category to intermediate or suscep.ible and/or from intermediate category to suscep.ible. Both EGCG and EGCG-S worked comp.rably on Gram-p.sitive bacteria;in S. aureus, both comp.unds enhanced 5 antibiotics (AM10, CF30, C30, S10 and TE30) activities while EGCG-S had higher efficiency. B. megaterium were suscep.ible to most of the antibiotic treatment, thus the imp.ct of EGCG and EGCG-S was insignificant. EGCG-S worked better than EGCG on Gram-negative bacteria;converted 9 antibiotics suscep.ibility in E. coli and p. aeruginosa, and 8 antibiotics in E. aerogenes. EGCG and EGCG-S also showed synergism on acid-fast bacter

关键词： EGCG EGCG-Stearate Antibiotic Resistance Disk Diffusion Methods

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