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Science china(Technological Sciences) 2024年第4期67卷 1124-1132页

作者： XIAO Lu GUO XiaoXiang SUN YuTong WANG Gang LONG Weimin liaw Peter K. REN JingLi School of mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China Academy of mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China Institute of materials Shanghai UniversityShanghai 200444China SKL of Advanced Brazing metals&Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001China Department of materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

This study investigated the atomic-scale deformation mechanism of multiphase cocrFeNi high-entropy alloys(HEAs)at liquid helium,liquid nitrogen,and room temperatures.A million-atom multiphase HEA was prepared using molecular dynamics simulation involving melt and quench *** HEA exhibited high-density dislocations and some twins,consistent with experimental *** analysis revealed an inconsistent evolution of the microstructure under tensile *** particular,the elastic and initial plastic stages exhibited an increase in the disordered structure at the expense of the face-centered cubic and hexagonal close-packed structures,followed by a subsequent transformation involving multiple structural ***,through sparse identification,a model depicting microstructural evolution during tension was extracted for the cocrFeNi HEA at three typical temperatures and three tensile *** model highlighted the importance of the body-centered cubic structure in the evolutionary process.

关键词： high-entropy alloy data-driven method microstructure evolution multiphase structure molecular dynamics simulation

microstructure evolution and deformation mechanism of amorphous/crystalline high-entropy-alloy composites

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Journal of materials Science & Technology 2020年第19期54卷 14-19页

作者： Jia Li Haotian chen Hui Feng Qihong Fang Yong Liu Feng Liu Hong Wu Peter K liaw State Key Laboratory of Advanced Design and manufacturing for Vehicle Body Hunan UniversityChangsha 410082China State Key Laboratory of Powder metallurgy Central South UniversityChangsha 410083China Department of materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

High-entropy amorphous alloys present high hardness,but low tensile ***,deformation behavior of the amorphous/crystalline Fe co cr Ni high-entropy alloy(HEA)composite prepared by the previous experiment is investigated using atomic *** result shows the partial dislocations in the crystal HEA layer,and the formation of shear bands in the amorphous HEA layer occurs after *** strength of the amorphous/crystalline HEA composite reduces with increasing the thickness of the amorphous layer,agreeing with the previous *** coupled interaction between the crystal plasticity and amorphous plasticity in amorphous/crystalline HEA composites results in a more homogeneous redistribution of plastic deformation to cause interface hardening,due to the complex stress field in the amorphous *** current findings provide the insight into the deformation behavior of the amorphous/crystalline HEA composite at the nanoscale,which are useful for optimizing the structure of the HEA composite with high strength and good plasticity.

关键词： High-entropy alloy Amorphous/crystalline composite Deformation behavior Strengthening mechanism molecular dynamics

microstructural evolution of(TiAl)+Nb+W+B alloy

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Transactions of Nonferrous metals Society of china 2011年第10期21卷 2192-2198页

作者：黄岚 P.K.liaw c.T.LIU 刘咏黄劲松 Department of materials Science and Engineering The University of Tennessee 香港城市大学机械与生物医学工程系中南大学粉末冶金研究院长沙410083

A newly designed TiAl alloy containing W,Nb,and B was produced through magnetic-flotation-melting *** production of this TiAl-based alloy,15 kg ingot size,which is quite different from the 0.05 kg small ingot produced by arc-melting,has a large effect on the metallurgical properties,such as the grain size and the phase structures of the *** treatments were carefully designed in order to reduce the amount of the high-temperature remaining β phase in the alloy,and to obtain optimal microstructures for mechanical behavior studies.A room-temperature ductility of 1.9% was obtained in the cast TiAl-based alloy after the appropriate heat *** mechanical behavior of the large ingot through mass production of the TiAl-based alloy was largely improved by the alloy design and subsequent heat treatments.

关键词： TiAl intermetallics W B tensile ductility microstructural evolution large ingot

Glia-to-neuron reprogramming to the rescue?

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Neural Regeneration Research 2025年第5期20卷 1395-1396页

作者： Jack W.Hickmott cindi m.morshead Department of Surgery University of TorontoTorontoONCanada Donnelly centre for cellular and Biomolecular Research TorontoONCanada Institute of Biomedical Engineering University of TorontoTorontoONCanada The KITE Research Institute Toronto Rehabilitation InstituteUniversity Health NetworkTorontoONCanada

Over the last two decades,the dogma that cell fate is immutable has been increasingly challenged,with important implications for regenerative *** brea kth rough discovery that induced pluripotent stem cells could be generated from adult mouse fibroblasts is powerful proof that cell fate can be *** exciting extension of the discovery of cell fate impermanence is the direct cellular reprogram ming hypothesis-that terminally differentiated cells can be reprogrammed into other adult cell fates without first passing through a stem cell state.

关键词： programming passing proof

Effects of temperature on the tribological behavior of Al0.25cocrFeNi high-entropy 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-Entropy 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 Department of materials Science and Engineering The University of Tennessee Knoxville TN 37996-2200 USA

The tribological behavior of Al0.25 cocrFeNi high-entropy alloy(HEA) sliding against Si3N4 ball was investigated from room temperature to 600°. The microstructure of the alloys was characterized by simple Fcc phase with 260 HV. Below 300°, with increasing temperature, the wear rate increased due to high temperature 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 temperature 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 temperature microstructure Oxidation Rapid solidification Sliding Wear mechanism

Fundamental electronic structure and multiatomic bonding in 13 biocompatible high-entropy alloys

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npj computational materials 2020年第1期6卷 1296-1305页

作者： Wai-Yim ching Saro San Jamieson Brechtl Ridwan Sakidja miqin Zhang Peter K.liaw Department of Physics and Astronomy University of Missouri Kansas CityKansas CityMO 64110USA The Bredesen center for Interdisciplinary Research and Graduate Education The University of TennesseeKnoxvilleTN 37996-3394USA Department of Physics Astronomy and Materials ScienceMissouri State UniversitySpringfieldMO 65897USA Department of materials Science and Engineering The University of WashingtonSeattleWA 98195USA Department of materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2100USA

High-entropy alloys(HEAs)have attracted great attention due to their many unique properties and potential *** nature of interatomic interactions in this unique class of complex multicomponent alloys is not fully developed or *** report a theoretical modeling technique to enable in-depth analysis of their electronic structures and interatomic bonding,and predict HEA properties based on the use of the quantum mechanical metrics,the total bond order density(TBOD)and the partial bond order density(PBOD).Application to 13 biocompatible multicomponent HEAs yields many new and insightful results,including the inadequacy of using the valence electron count,quantification of large lattice distortion,validation of mechanical properties with experiment data,modeling porosity to reduce Young’s *** work outlines a road map for the rational design of HEAs for biomedical applications.

关键词： alloys bonding entropy

Phase stability and mechanical properties of wire+arc additively manufactured H13 tool steel at elevated temperatures

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Journal of materials Science & Technology 2021年第8期67卷 80-94页

作者： A.N.m.Tanvir md.R.U.A hsan Gijeong Seo Brian Bates chanho Lee Peter K.liaw mark Noakese Andrzej Nycz changwook Ji Duck Bong Kim Department of mechanical Engineering Tennessee Technological UniversityCookevilleTN 38505USA Department of manufacturing and Engineering Technology Tennessee Technological UniversityCookevilleTN 38505USA center for manufacturing Research Tennessee Technological UniversityCookevilleTN 38505USA Department of materials Science and Engineering University of TennesseeKnoxvilleTN 37996USA manufacturing Demonstration Facility Oak Ridge National LaboratoryOak RidgeTN 37830USA Advanced Forming Process R&D Group Korea Institute of Industrial TechnologyUlsan 44413Republic of Korea

Wire+arc additive manufacturing(WAAm)is considered an innovative technology that can change the manufacturing landscape in the near *** offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium-and large-sized parts such as die-casting *** this study,AISI H13 tool steel,a popular die-casting tool metal,is manufactured by cold metal transfer(cmT)-based WAAm and is then comprehensively analyzed for its microstructural and mechanical ***-dependent phase combinations are observed,which could be explained by nonequilibrium thermal cycles that resulted from the layer-by-layer stacking mechanism used in *** addition,remelting and reheating of the layers reduces welding anomalies(e.g.,pores and voids).The metallurgical characteristics of the H13 strongly correlate with the mechanical *** combinations of phases at different locations of the additively manufactured part exhibit a periodic microhardness ***,Retained Austenite,Ferrite,and carbide phases are found in combination at different locations of the part based on the part’s temperature distribution during additive ***,the tensile properties at elevated temperatures(23℃,300℃,and 600℃)are comparable to those from other WAAm and additive manufacturing(Am)*** X-ray diffraction results verify that the microstructural stability of the fabricated parts at high temperatures would allow them to be used in high temperatures.

关键词： Tool steel martensitic steel Wire+arc additive manufacturing(WAAm) High temperature tensile test High temperature XRD

Advancing healthcare through laboratory on a chip technology:Transforming microorganism identification and diagnostics

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World Journal of clinical cases 2025年第3期13卷 9-19页

作者： carlos m Ardila Department of Basic Sciences Biomedical Stomatology Research GroupUniversidad de Antioquia U de AMedellín 0057Colombia

In a recent case report in the World Journal of clinical cases,emphasized the crucial role of rapidly and accurately identifying pathogens to optimize patient treatment ***-on-a-chip(LOc)technology has emerged as a transformative tool in health care,offering rapid,sensitive,and specific identification of *** editorial provides a comprehensive overview of LOc technology,highlighting its principles,advantages,applications,challenges,and future *** studies from the field have demonstrated the practical benefits of LOc devices in clinical diagnostics,epidemiology,and food *** studies have underscored the superiority of LOc technology over traditional methods,showcasing improvements in speed,accuracy,and *** future integration of LOc with biosensors,artificial intelligence,and data analytics promises further innovation and *** call to action emphasizes the importance of continued research,investment,and adoption to realize the full potential of LOc technology in improving healthcare outcomes worldwide.

关键词： Laboratory-on-a-chip microorganism identification Diagnostics Point-ofcare testing Biosensors

Butt-welding Residual Stress of Heat Treatable Aluminum Alloys

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Journal of materials Science & Technology 2007年第2期23卷 217-222页

作者： c.m. cheng Department of Industrial Education National Taiwan Normal University Taipei Taiwan China　

This study, taking three types of aluminum alloys 2024-T351, 6061-T6 and 7075-T6 as experimental materials, conducted single V-groove GTAW （gas tungsten arc welding） butt-welding to analyze and compare the magnitude and differences of residual stress in the three aluminum alloys at different single V-groove angles and in restrained or unrestrained conditions. The results show that the larger the grooving angle of butt joint, the higher the residual tensile stress. Too small grooving angle will lead to dramatic differences due to the amount of welding bead filler metal and pre-set joint geometry. Therefore, only an appropriate grooving angle can reduce residual stress. While welding, weldment in restrained condition will lead to a larger residual stress. Also, a residual stress will arise from the restraint position. The ultimate residual stress of weldment is determined by material yield strength at equilibrium temperature. The higher the yield strength at equilibrium temperature, the higher the material residual stress. Because of its larger thermal conductivity, aluminum alloy test specimens have small temperature differential. Therefore, the residual tensile stress of all materials is lower than their yield strength.

关键词： Residual stress Hole-drilling strain-gage method Aluminum alloy Single-V groove

Achieving high strength-ductility synergy in a mg_(97)Y_(1)Zn_(1)Ho_(1) alloy via a nano-spaced long-period stacking-ordered phase

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Journal of magnesium and Alloys 2023年第4期11卷 1321-1331页

作者： mingyu Fan Ye cui Yang Zhang Xinghao Wei Xue cao Peter K.liaw Yuansheng Yang Zhongwu Zhang Key Laboratory of Superlight materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001PR China college of computer Science and Technology Harbin Engineering UniversityHarbin 150001PR China Department of materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2100USA Institute of metal Research Chinese Academy of SciencesShenyang 110016PR China

Achieving high strength in mg alloys is usually accompanied by ductility ***,a novel mg97Y1Zn1Ho1 at.%alloy with a yield strength of 403 mPa and an elongation of 10%is *** strength-ductility synergy is obtained by a comprehensive strategy,including a lamella bimodal microstructure design and the introduction of nano-spaced solute-segregated 14H long-period stacking-ordered phase(14H LPSO phase)through rare-earth Ho *** lamella bimodal microstructure consists of elongated un-recrystallized(un-DRXed)coarse grains and fine dynamically-recrystallized grains(DRXed regions).The nano-spaced solute-segregated 14H LPSO phase is distributed in DRXed *** outstanding yield strength is mainly contributed by grain-boundary strengthening,18R LPSO strengthening,and fiberlike reinforcement strengthening from the nano-spaced 14H LPSO *** high elongation is due primarily to the combined effects of the bimodal and lamellar microstructures through enhancing the work-hardening capability.

关键词： mg wrought alloy mechanical properties Long-period stacking-ordered(LPSO)phase Age-strengthening behavior Strengthening mechanism