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| 1 | Effects of temperature on the tribological behavior of Al0.25CoCrFeNi high-entropy alloy显示文摘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°. | L.M.Du L.W.Lan S.Zhu H.J.Yang X.H.Shi P.K.Liaw J.W.Qiao | 2019 | Journal of Materials Science & Technology2019，35，5： | 17 |
| 2 | 3种高温合金的蠕变-疲劳交互作用行为及寿命预测显示文摘通过在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. | 陈立佳 吴崴 P.K.Liaw | 2006 | 金属学报2006，42，9： | 9 |
| 3 | (TiAl)+Nb+W+B合金的微观组织演变(英文)显示文摘通过磁悬浮法制备含有W、Nb、B的重15kgTiAl合金大锭。此合金大锭与电弧熔炼的0.05kg的小样品相比,存在晶粒大小和相组织结构性质方面的区别。设计了一系列热处理工艺来消除大锭合金的高温残留β相,并获取理想的微观组织。铸态大锭合金在经过适当的热处理工艺后室温伸长率可达1.9%。这种大批量方式生产的TiAl合金,通过新合金设计与相应的热处理后,其力学性能可获得显著提高。 | 黄岚 P.K.LIAW C.T.LIU 刘咏 黄劲松 | 2011 | Transactions of Nonferrous Metals Society of China2011，21，10： | 5 |
| 4 | High strength-superplasticity combination of ultrafine-grained ferritic steel:The significant role of nanoscale carbides显示文摘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 temperature.In 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 strength.Nevertheless,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(<0.42 Tm)superplasticity(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. | J.W.Liang Y.F.Shen R.D.K.Misra P.K.Liaw | 2021 | Journal of Materials Science & Technology2021，，24： | 5 |
| 5 | High throughput synthesis enabled exploration of CoCrFeNi-based high entropy alloys显示文摘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 space.These 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 computationally.From 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 alloys.In 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. | 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 | 2022 | Journal of Materials Science & Technology2022，，15： | 4 |
| 6 | Microstructural evolution and mechanical properties of FeCoCrNiCu high entropy alloys:a microstructure-based constitutive model and a molecular dynamics simulation study显示文摘High entropy alloys(HEAs)attract remarkable attention due to the excellent mechanical performance.However,the origins of their high strength and toughness compared with those of the traditional alloys are still hardly revealed.Here,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 indentation.Due to the interaction between the dislocation and solution,the high dislocation density in FeCoCrNiCu leads to strong work hardening.Plentiful slip systems are stimulated,leading to the good plasticity of FeCoCrNiCu.The plastic deformation of FeCoCrNiCu is basically affected by the motion of dislocation loops.The 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 the<111>slip direction.In 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 curve.Strong dislocation strengthening and remarkable lattice distortion strengthening occur in the deformation process of FeCoCrNiCu,and improve the strength.Therefore,the origins of high strength and high toughness in FeCoCrNiCu HEAs come from lattice distortion strengthening and the more activable slip systems compared with Cu.These results accelerate the discovery of HEAs with excellent mechanical properties,and provide a valuable reference for the industrial application of HEAs. | Gangjie LUO Li LI Qihong FANG Jia LI Yuanyuan TIAN Yong LIU Bin LIU Jing PENG P.K.LIAW | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，8： | 3 |
| 7 | Predicting temperature-dependent ultimate strengths of body-centered-cubic(BCC)high-entropy alloys显示文摘This paper presents a bilinear log model,for predicting temperature-dependent ultimate strength of high-entropy alloys(HEAs)based on 21 HEA compositions.We 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 specifications.For reliable operation,the operating temperature of alloys may need to stay below Tbreak.We introduce a technique of global optimization,one enabling concurrent optimization of model parameters over low-temperature and high-temperature regimes.Furthermore,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 strength.We 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. | B.Steingrimsson X.Fan X.Yang M.C.Gao Y.Zhang P.K.Liaw | 2021 | npj Computational Materials2021，，1： | 1 |
| 8 | Effects of rapid heating cyclic heat treatment on microstructures and compression mechanical properties of TiAl-based alloy显示文摘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. | 彭超群 贺跃辉 黄伯云 P.K.Liaw | 2004 | 中国有色金属学会会刊:英文版2004，14，3： | 1 |
| 9 | Effects of grain boundary on irradiation-induced zero-dimensional defects in an irradiated copper显示文摘Grain boundaries(GBs)can serve as effective sinks for radiation-induced defects,thus notably influencing the service performance of materials.However,the effect of GB structures on the zero-dimensional defects induced by irradiation has not been fully elucidated.Here,the evolution of cascade collision in the single-crystal(SC),bicrystalline(BC),and twinned crystalline(TC)copper is studied by atomic simulations during irradiation.The spatial distributions of vacancies and interstitials are closely related to the GB at a certain primary knock-on atom(PKA)energy.Compared 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 energy.The 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 distribution.There are similar sub-conical defect distributions and microstructures induced by cascade collision in the TC and the SC.It has been found that the influence range of the GB is wider in the BC.Meanwhile,the average flow stress of the irradiated copper is quantitatively calculated by establishing a physical strengthening model.The 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 vacancies.This study provides a theoretical basis for further understanding and customization of the metal-based equipment with good radiation resistance. | Jing PENG Shiyong CUI Yuanyuan TIAN Qihong FANG Jia LI P.K.LIAW | 2022 | Applied Mathematics and Mechanics(English Edition)2022，43，2： | 0 |
| 10 | 磁控功能合金功能行为的原位表征——高能X射线与中子衍射技术显示文摘报道了课题组在国际上率先开展利用同步辐射高能X射线衍射和中子衍射技术,成功地实现了多场(温度场,磁场,应力场)耦合作用下,铁磁性记忆合金微结构、晶粒取向、磁结构、母相与变体取向及其与功能行为耦合的原位研究。利用原位飞行时间中子衍射技术,跟踪了铁磁性形状记忆合金Ni-Mn-Ga在单轴压力下马氏体变体的转变行为,这是目前其它方法(如EBSD)仍无法实现的。测试了M_s点为393K的Ni_(47)Mn_(25)Ga_(22)Co_4合金在不同的单轴压力(0,-60MPa,-110MPa,-140MPa,-7MPa)下从523~298K之间的中子衍射花样,并利用GSAS软件获得了不同单轴压力下马氏体相的反极图(IPFs)。利用高能球磨及后续热处理的方法制备出了Ni_(51)Mn_(27)Ga_(22)纳米颗粒。铁磁性Ni_2MnGa纳米颗粒功能行为受晶粒尺寸,原子有序度及固有磁结构交互作用的影响,经历了各种不同的结构转变序,这与它们相应的块体材料是完全不同的。通过高能球磨法制备出尺寸分布均匀约10 nm左右的Ni_(51)Mn_(27)Ga_(22)颗粒,其室温晶体结构由原始的体心四方结构转变为一种无序面心立方结构。高能球磨后的纳米颗粒经过623K,4h退火后,又完全转变为Heusler母相结构。利用高能X射线研究了该纳米颗粒在退火过程中结构的原位转变,证明转变动力学由一种具有非晶结构的中间相控制。高能球磨及后续热处理之后的纳米粒子,在约274K下转变为调制马氏体(14M)结构,并且该结构可以稳定到4K。 | 王沿东 聂志华 刘冬梅 徐家桢 左良 Yang Ren P.K.Liaw D.W.Brown | 2007 | 功能材料信息2007，，5： | 0 |
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