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Effects of grain boundary on irradiation-induced zero-dimensional defects in an irradiated copper

Applied Mathematics and Mechanics(English Edition) 2022年第2期43卷 233-246页

作者： Jing pENG Shiyong CUI Yuanyuan TIAN Qihong FANG Jia LI p.k.liaw State key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTennessee37996U.S.A

Grain boundaries(GBs)can serve as effective sinks for radiation-induced defects,thus notably influencing the service performance of ***,the effect of GB structures on the zero-dimensional defects induced by irradiation has not been fully ***,the evolution of cascade collision in the single-crystal(SC),bicrystalline(BC),and twinned crystalline(TC)copper is studied by atomic simulations during *** spatial distributions of vacancies and interstitials are closely related to the GB at a certain primary knock-on atom(pkA)*** with the TC,the BC displays a more obvious segregation of the interstitial atoms near GB,due to the characteristic of the greater interstitial binding *** evolution of Frenkel pairs is more sensitive to the change of the GB position in the BC.A more prominent defect annihilation rate is caused by the effect of the GB than that of the twin boundary(TB).The marked secondary emission phenomenon has been observed in the BC,which promotes the formation of an inverted pagoda-like defect *** are similar sub-conical defect distributions and microstructures induced by cascade collision in the TC and the *** has been found that the influence range of the GB is wider in the ***,the average flow stress of the irradiated copper is quantitatively calculated by establishing a physical strengthening *** contribution of vacancy to the average flow stress in the irradiated BC and TC is obvious than that in the SC,due to the formation of many *** study provides a theoretical basis for further understanding and customization of the metal-based equipment with good radiation resistance.

关键词： irradiation cascade collision grain boundary(GB) interstitial and vacancy molecular dynamics(MD)simulation physical strengthening model

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Effects of rapid heating cyclic heat treatment on microstructures and compression mechanical properties of TiAl-based alloy

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中国有色金属学会会刊：英文版 2004年第3期14卷 459-463页

作者：彭超群贺跃辉黄伯云 p.k.liaw State key Laboratory for powder Metallurgy Materials Science and Engineering Department

By means of rapid heating cyclic heat treatment, the microstructure of a TiAl-based alloy was refined. The colony size and lamellar spacing were measured to be 50 μm and 0.12 μm, respectively. The compression mechanical properties were determined at room temperature and the best comprehensive mechanical properties can reach σ0.2 of 745.1 Mpa, σp of 1 672.2 Mpa and δ of 19.40%. The improvement of mechanical properties is caused by the microstructural refinement and the phase interface nucleation contributes a lot to the refinement of microstructure.

关键词： TiAl合金钛合金热处理显微结构机械性能压缩试验

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High strength-superplasticity combination of ultrafine-grained ferritic steel:The significant role of nanoscale carbides

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Journal of Materials Science & Technology 2021年第24期83卷 131-144页

作者： J.W.Liang Y.F.Shen R.D.k.Misra p.k.liaw key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang110004China The State key Lab of Rolling&Automation Northeastern UniversityShenyang110819China Laboratory for Excellence in Advanced Steel Research University of Texas at El PasoTX79968USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA

There is currently a gap in our understanding of mechanisms that contribute to high strength and high plasticity in high strength UFG ferritic steel with nano-size Fe3 C carbides in situations that involve combination of various strain rates and high *** this regard,we describe the mechanistic basis of obtaining high strength-high plasticity combination in an ultrafine-grained(UFG)(~500±30 nm)ferritic steel with nano-size carbides,which sustained large plastic deformation,exceeding 100%elongation at a temperature significantly below 0.5 of the absolute melting point(Tm).To address the missing gap in our knowledge,we conducted a series of experiments involving combination of strain rate and temperature effects in conjunction with electron microscopy and atom probe tomography(ApT).Strain rate studies were carried out at strain rates in the range of 0.0017-0.17 s^(-1)and at different temperatures from 25℃to 600℃.Dynamic recrystallization occurred at 600℃,resulting in a significant decrease in yield and tensile ***,the UFG ferritic steels had an advantage in tensile strength(UTS)and elongation-to-failure(εf)at 600℃,especially at strain rate of 0.0017 s^(-1),with high UTSof 510 Mpa and excellent low temperature(perplasticity(εf=110%).These mechanical properties are significantly superior compared to similar type of steels at identical temperature.A mechanistic understanding of mechanical behavior of UFG ferritic steels is presented by combining the effect of strain rate,temperature,and nano-size carbides.

关键词： UFG ferritic steel Strain rate Temperature Nano-size precipitate Low temperature superplasticity

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High throughput synthesis enabled exploration of CoCrFeNi-based high entropy 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 precision 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 Department of Materials Science and Engineering The University of Tennessee37996USA

To accelerate the exploration,screening,and discovery of structural high-entropy alloys with targeted properties,the newly developed High-Throughput Hot-Isostatic-pressing based Micro-Synthesis Approach(HT-HIp-MSA)is employed to efficiently synthesize and characterize 85 combinatorial alloys in a 13-principal element alloying *** Co Cr Fe Ni-based high entropy alloys span 1 quaternary,9 quinary,and 36 senary alloy systems,and their composition-structure-property relationships are characterized and analyzed experimentally and *** the single-phase FCC CoCrFeNi alloy base,with Mn,Cu,Ti,Nb,Ta,Mo,W,Al,and Si as principal element alloying additions,we find(1)the extended Mn solubility in the single-phase 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 computational methods,the HT-HIp-MSA can be systematic and economic to explore and refine the compositions,structures,and properties of structural high-entropy alloys.

关键词： High-entropy alloys High-throughput Composition-structure-property

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3种高温合金的蠕变-疲劳交互作用行为及寿命预测

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金属学报 2006年第9期42卷 952-958页

作者：陈立佳吴崴 p.k.liaw 沈阳工业大学材料科学与工程学院沈阳110023 Department of Materials Science and Engineering

通过在816和927℃下进行总应变控制的不同拉伸应变保持时间的低周疲劳实验,研究了3种高温合金(HAYNES 188,HAYNES 230和HASTELLOY X)的蠕变-疲劳交互作用行为．结果表明,这3种高温合金的应变疲劳寿命主要取决于合金类型、应变保持周期... 详细信息

通过在816和927℃下进行总应变控制的不同拉伸应变保持时间的低周疲劳实验,研究了3种高温合金(HAYNES 188,HAYNES 230和HASTELLOY X)的蠕变-疲劳交互作用行为．结果表明,这3种高温合金的应变疲劳寿命主要取决于合金类型、应变保持周期及实验温度．这些高温合金所表现出的不同应变疲劳寿命行为可归因于蠕变和氧化损伤方面的差异．此外,应用频率修正的非弹性拉伸应变能作为损伤函数对这3种合金进行了应变疲劳寿命预测,结果显示该寿命预测方法对3种高温合金均表现出较好的寿命预测能力．

关键词：高温合金蠕变-疲劳交互作用应力松弛寿命预测

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Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-type nanoparticle-strengthened high-entropy 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 Department 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 Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of Hong kong China

The precipitate morphologies,coarsening kinetics,elemental partitioning behaviors,grain structures,and tensile properties were explored 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-entropy alloys(HEAs).By substituting Ti with Nb,the spheroidal-to-cuboidal precipitate morphological transition,increase in the coarsening kinetics,and phase decomposition upon aging at 800°C *** excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1_(2)to lamellar-structured D019 phase upon the long-term aging *** partially substituting Ti with Nb,the chemically complex and thermally stable L12 phase with a composition 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 phase structure and clean grain boundaries,which guarantees the superb high-temperature mechanical properties(791±7 Mpa for yielding and 1013±11 Mpa for failure)at 700℃.Stacking faults(SFs)were observed to prevail during the plastic deformation,offering a high work-hardening capability at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1_(2)particles.

关键词： High-entropy alloys Coarsening kinetics Coherent precipitation strengthening Mechanical properties

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Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys:a microstructure-based constitutive model and a molecular dynamics simulation study

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1109-1122页

作者： Gangjie LUO Li LI Qihong FANG Jia LI Yuanyuan TIAN Yong LIU Bin LIU Jing pENG p.k.liaw College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China State key Laboratory for powder Metallurgy Central South UniversityChangsha 410083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996U.S.A.

High entropy alloys(HEAs)attract remarkable attention due to the excellent mechanical ***,the origins of their high strength and toughness compared with those of the traditional alloys are still hardly ***,using a microstructure-based constitutive model and molecular dynamics(MD)simulation,we investigate the unique mechanical behavior and microstructure evolution of FeCoCrNiCu HEAs during the *** to the interaction between the dislocation and solution,the high dislocation density in FeCoCrNiCu leads to strong work *** slip systems are stimulated,leading to the good plasticity of *** plastic deformation of FeCoCrNiCu is basically affected by the motion of dislocation *** prismatic dislocation loops inside FeCoCrNiCu are formed by the dislocations with the Burgers vectors of a/6[112]and a/6[112],which interact with each other,and then emit along theslip *** addition,the mechanical properties of FeCoCrNiCu HEA can be predicted by constructing the microstructure-based constitutive model,which is identified according to the evolution of the dislocation density and the stress-strain *** dislocation strengthening and remarkable lattice distortion strengthening occur in the deformation process of FeCoCrNiCu,and improve the ***,the origins of high strength and high toughness in FeCoCrNiCu HEAs come from lattice distortion strengthening and the more activable slip systems compared with *** results accelerate the discovery of HEAs with excellent mechanical properties,and provide a valuable reference for the industrial application of HEAs.

关键词： molecular dynamics(MD)simulation microstructure-based constitutive model high entropy alloy(HEA) deformation behavior

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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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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

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Crystal Structures and Textures in the Hot-Forged Ni-Mn-Ga Shape Memory Alloys

Crystal Structures and Textures in the Hot-Forged Ni-Mn-Ga S...

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第三届散裂中子源多学科应用研讨会

作者： p．Zetterstrm p.k.liaw The Studsvik Neutron Research Laboratory （NFL） Uppsala University S-61182 Nykping Sweden Department of Materials Science and Engineering The University of Tennessee Knoxville TN37996 USA

＜正＞Three ferromagnetic shape-memory alloys with the chemical compositions of Ni53Mn25Ga22, Ni48Mn30Ga22 and Ni48Mn25Ga22Co5 were prepared by the induction-melting and hot-forging process. The crystal structures were investigated by the neutron powder diffraction technique, showing that Ni53Mn25Ga22 and Ni48Mn25Ga22Co5 have a tetragonal,

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