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Local chemical ordering and its impact on radiation damage behavior of multi-principal element alloys

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Journal of Materials Science & Technology 2023年第4期135卷 13-25页

作者： Leqing liu xiongjun liu Qing Du Hui Wang Yuan Wu Suihe Jiang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

Multi-principal element alloys(MPEAs)have attracted much attention as future nuclear materials due to their extraordinary radiation *** this work,we have elucidated the development of local chemical orderings(LCOs)and their influences on radiation damage behavior in the typical CrFeNi MPEA by hybrid-molecular dynamics and Monte Carlo *** was found that considerable LCOs consist-ing of the Cr-Cr and Ni-Fe short-range orders existed in the ordered configuration with optimized system *** modeling the accumulation cascades up to 1000 recoils,we revealed that the size of de-fect clusters and dislocation loops is smaller in the ordered configuration than those in the random one,although the former formed more Frenkel pairs(i.e.,self-interstitials and vacancies).In addition,the dis-tribution of dislocation loops is relatively more dispersed in the ordered configuration,and the stair-rod dislocations related to irradiation swelling are also smaller,implying that the existence of LCOs is con-ducive to enhancing radiation damage *** understand the underlying mechanism,the effects of LCOs on the formation and evolution of defects and radiation resistance were discussed from the aspects of atomic bonding,migration path,and energy of defect diffusion,which provides theoretical guidance for the design of MPEAs with enhanced radiation resistance.

关键词： Multi-principal element alloys Local chemical ordering Radiation damage Dislocation evolution Molecular dynamics simulation

Revealing the role of local shear strain partition of transformable particles in a TRIP-reinforced bulk metallic glass composite via digital image correlation

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 807-813页

作者： Xiaoyuan Yuan Yuan Wu xiongjun liu Hui Wang Suihe Jiang Zhaoping Lü State Key Laboratory for Advanced Metals and Materials Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China

The coupling effects of the metastable austenitic phase and the amorphous matrix in a transformation-induced plasticity(TRIP)-reinforced bulk metallic glass(BMG)composite under compressive loading were investigated by employing the digital image correlation(DIC)*** evolution of local strain field in the crystalline phase and the amorphous matrix was directly monitored,and the contribution from the phase transformation of the metastable austenitic phase was *** shear strain was found to be effectively consumed by the displacive phase transformation of the metastable austenitic phase,which relaxed the local strain/stress concentration at the interface and thus greatly enhanced the plasticity of the TRIP-reinforced BMG *** current study sheds light on in-depth understanding of the underlying deformation mechanism and the interplay between the amorphous matrix and the metastable crystalline phase during deformation,which is helpful for design of advanced BMG composites with further improved properties.

关键词： bulk metallic glass composite transformation-induced plasticity digital image correlation local shear strain

Effect of complex hydraulic variables and physicochemical factors on freshwater mussel density in the largest floodplain lake,China

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Ecological Processes 2023年第1期12卷 232-245页

作者： Chenchen Jia Chenhuizi Wu Xiaochen Huang Chunhua Zhou Shan Ouyang xiongjun liu Xiaoping Wu School of Life Sciences Nanchang UniversityNanchang 330031China Guangdong Provincial Key Laboratory of Conservation and Precision Utilization of Characteristic Agricultural Resources in Mountainous Areas School of Life SciencesJiaying UniversityMeizhou 514015China

Background Habitat degradation and flow regime alterations are two of the most prominent and common impact factors to freshwater mussel *** of the correlation between freshwater mussel distribution,density and habitat characteristics is important for maintaining and restoring their biodiversity and ecological *** on predicting habitat suitability of freshwater mussels is lacking in ***,we aimed to analyze the correlation between freshwater mussel density and complex hydraulic and physicochemical variables to predict habitat *** The results showed that four complex hydraulic variables(boundary Reynolds number,critical shear stress,bed roughness and mean sediment particle size)and four physicochemical variables(water temperature,chlorophylla,transparency and pH)were key factors for predicting habitat suitability of freshwater *** mussel density was significantly correlated with Froude number,water temperature and *** Our results confirmed that higher freshwater mussel density would be associated with areas that are stable in complex hydraulic and physicochemical *** results provide an important insight into the conservation of freshwater mussel diversity and their habitat restoration in China and globally.

关键词： Habitat suitability Freshwater mussel Complex hydraulic variable Habitat degradation

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Eight in one:high-entropy-alloy nanoparticles synthesized by carbothermal shock

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Science Bulletin 2018年第12期63卷 737-738页

作者： Yuan Wu Zhifeng Lei xiongjun liu Hui Wang Zhaoping Lu State Key Laboratory for Advanced Metals and Materials University of science and Technology Beijing

Since the Bronze Age to the early 21st century,development of metals and alloys have been limited to one principal element with minor addition of relatively small amounts of other elements,such as steels,titanium allo... 详细信息

关键词：钛合金青铜时代原子部分元素铝合金基础金属钢

Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

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Journal of Materials Science & Technology 2024年第14期181卷 220-230页

作者： Shenglong Liang Xiaochun liu Suihe Jiang Huihui Zhu Wei Li Leqing liu xiongjun liu Yuan Wu Xiaobin Zhang Hui Wang Zhaoping Lu Beijing Advanced Innovation Centre for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410000China Liaoning Academy of Materials Shenyang 110000China Inner Mongolia University of science and technology Instrumental Analysis CenterBaotou 014000China

Producing ultrafine-grained(UFG)microstructures with enhanced thermal stability is an important yet challenging route to further improve mechanical properties of structural ***,a high-performance bulk UFG copper that can stabilize even at temperatures up to 750℃(∼0.75 T m,T m is the melting point)was fabricated by manipulating its recrystallization behavior via low alloying of *** of 1 wt.%–1.5 wt.%of Co can trigger quick and copious intragranular clustering of Co atoms,which offers high Zener pinning pressure and pins the grain boundaries(GBs)of freshly recrystallized ul-trafine *** to the fact that the subsequent growth of the coherent Co-enriched nanoclusters was slow,sufficient particles adjacent to GBs remained to inhibit the migration of GBs,giving rise to the UFG microstructure with prominently high thermal *** work manifests that the strategy for pro-ducing UFGs with coherent precipitates can be applied in many alloy systems such as Fe-and Cu-based,which paves the pathway for designing advanced strain-hardenable UFGs with plain compositions.

关键词： Copper alloys Coherent precipitation Ultrafine-grained materials Recrystallization Microstructural stability

Atomic structures of Zr-based metallic glasses

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Science China(Physics,Mechanics & Astronomy) 2008年第4期51卷 400-413页

作者： HUI XiDong liu xiongjun GAO Rui HOU HuaiYu FANG HuaZhi liu ZiKui CHEN GuoLiang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering Nanjing University of Science and TechnologyNan-jing 210014China Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA

The atomic structures of Zr-Ni and Zr-Ti-Al-Cu-Ni metallic glasses were investigated by using classical molecular dynamic (MD),reverse Monte Carlo (RMC),ab initio MD (AIMD) simulations and high resolution transmission electron microscopy (HRTEM) techniques. We focused on the short-range order (SRO) and medium-range order (MRO) in the glassy structure. It is shown that there are icosahedral,FCC-and BCC-type SROs in the Zr-based metallic glasses. A structural model,characterized by imperfect ordered packing (IOP),was proposed based on the MD simulation and confirmed by the HRTEM observation. Furthermore,the evolution from IOP to nanocrystal during the crystallization of metallic glasses was also ex-plored. It is found that the growth from IOP to nanocrystal proceeds through three distinct stages: the formation of quasi-ordered structure with one-dimensional (1D) periodicity,then 2D periodicity,and finally the formation of 3D nanocrystals. It is also noted that these three growth steps are crosslinked.

关键词： metallic glasses atomic structure short-range order medium-range order molecular dynamics reverse Monte Carlo

Characterization of local chemical ordering and deformation behavior in high entropy alloys by transmission electron microscopy

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 877-886页

作者： Qiuhong liu Qing Du Xiaobin Zhang Yuan Wu Andrey A.Rempel Xiangyang Peng xiongjun liu Hui Wang Wenli Song Zhaoping Lü Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences Ekaterinburg 620016Russia China Nuclear Power Technology Research Institute Co.Ltd. Shenzhen 518000China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China

Short-range ordering(SRO)is one of the most important structural features of high entropy alloys(HEAs).However,the chemical and structural analyses of SROs are very difficult due to their small size,complexed compositions,and varied *** electron microscopy(TEM)as well as its aberration correction techniques are powerful for characterizing SROs in these compositionally complex *** this short communication,we summarized recent progresses regarding characterization of SROs using TEM in the field of *** using advanced TEM techniques,not only the existence of SROs was confirmed,but also the effect of SROs on the deformation mechanism was ***,the perspective related to application of TEM techniques in HEAs are also discussed.

关键词： high entropy alloys transmission electron microscopy short-range ordering deformation mechanisms

In-situ Mg_(77)Cu_(12)Zn_5Y_6 bulk metallic glass matrix composite with extraordinary plasticity

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Chinese Science Bulletin 2006年第2期51卷 229-234页

作者： HUI Xidong DONG Wei WANG Meiling liu xiongjun YU Jialing CHEN Guoliang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

We report experimental evidence of in-situ Mg77Cu12Zn5Y6 bulk metallic glass (BMG) ma- trix composite with extraordinary plastic strain of 18.5% and specific strength of 4.31×105 N·m·kg?1, which are the highest plasticity and specific strength in Mg base BMG alloys reported to date. The excel- lent mechanical properties are attributed to the for- mation of the composite structure which is composed of amorphous matrix and hexagonal-close-packed (hcp) Mg solid solution needle phase with a width less than 500 nm. As plastic phase, the Mg needles not only possess the capability of deformation but also have work hardening phenomenon effect. They give rise to multiple shear bands, and hinder the propagation of local shear band in amorphous matrix.

关键词： Mg77Cu12Zn5Y6 金属玻璃定向凝固共晶体复合材料塑性强度系数

Enhancing properties of high-entropy alloys via manipulation of local chemical ordering

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Journal of Materials Science & Technology 2024年第13期180卷 23-31页

作者： Yihan Wang Meiyuan Jiao Yuan Wu xiongjun liu Hui Wang Suihe Jiang Xiaobin Zhang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

*** High entropy alloys(HEAs),arising from the incorporation of multiple principal elements[1,2],have garnered extensive atten-tion due to their great potential to be utilized under extreme con-ditions[3-5].

关键词： alloys entropy utilized