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Microstructures and micromechanical behaviors of high -entropy alloys investigated by synchrotron X-ray and neutron diffraction techniques: A review

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1333-1349页

作者： Yubo Huang Ning Xu Huaile Lu Yang Ren shilei li Yandong Wang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China AnSteel Beijing Research Institute Co.Ltd. Beijing 102200China Spallation Neutron Source Science Center Dongguan 523803China Department of Physics City University of Hong KongHong Kong 999077China Institute for Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)possess outstanding features such as corrosion resistance,irradiation resistance,and good mechan-ical properties.A few HEAs have found applications in the fields of aerospace and defense.Extensive studies on the deformation mech-anisms of HEAs can guide microstructure control and toughness design,which is vital for understanding and studying state-of-the-art structural materials.Synchrotron X-ray and neutron diffraction are necessary techniques for materials science research,especially for in situ coupling of physical/chemical fields and for resolving macro/microcrystallographic information on materials.Recently,several re-searchers have applied synchrotron X-ray and neutron diffraction methods to study the deformation mechanisms,phase transformations,stress behaviors,and in situ processes of HEAs,such as variable-temperature,high-pressure,and hydrogenation processes.In this review,the principles and development of synchrotron X-ray and neutron diffraction are presented,and their applications in the deformation mechanisms of HEAs are discussed.The factors that influence the deformation mechanisms of HEAs are also outlined.This review fo-cuses on the microstructures and micromechanical behaviors during tension/compression or creep/fatigue deformation and the application of synchrotron X-ray and neutron diffraction methods to the characterization of dislocations,stacking faults,twins,phases,and intergrain/interphase stress changes.Perspectives on future developments of synchrotron X-ray and neutron diffraction and on research directions on the deformation mechanisms of novel metals are discussed.

关键词： high-entropy alloys microstructures micromechanical behaviors synchrotron X-ray diffraction neutron diffraction

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Industrialization progress and challenges of cultivated meat

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Journal of Future Foods 2024年第2期4卷 119-127页

作者： Jiaqi Cai Shouwei Wang Yingying li Shengyan Dong Jun liang Yisen liu shilei li China Meat Research Center Beijing 100068China Beijing Academy of Food Sciences Beijing 100068China College of light Industry Science and Engineering Tianjin University of Science&TechnologyTianjin 300457China

With its more sustainable production mode and higher healthy food supplying,cultivated meat is gradually regarded as the promising alternative meat food in future by human beings.Most of the countries in the planet had participated in the cut-throat competition for sustainable protein searching,especially for the regions with low food self-sufficiency rate.In this paper,by reviewing the commercial market participation,product development stage,and technical research progress related to cultivated meat in detail,we demonstrated the industrialization progress of cultivated meat and explored the challenges of cultivated meat in the near future.1)Seeded cell and serum free medium were the basic raw materials,which were directly related to the food safety regulation,production cost control and productivity improvement;2)Bioreactor and regulation were the cornerstone of industrialization,which were closely related to the capacity expansion,product marketing;3)Technological improvements in taste,texture,safety,scale,cost were the foundation of realizing product iterative upgrade and market acceptance.

关键词： Cultivated meat Industrialization Progress Challenge

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Research on organized method and regulatory mechanism of Cell cultured meat based on modified silk

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Food Science and Human Wellness 2024年

作者： Feng Yang Haijuan Hu Yingying li shilei li Wenting liu Yu Qi Shouwei Wang China Meat Research Center Beijing Institute of Food Science

Cell cultured meat has been extensively studied as an environmentally friendly， energy-saving and more effective technology. However， there are many technical bottlenecks， especially the regulatory mechanism and manufacturing method of in vitro myogenesis. Based on an edible modified silk protein scaffold， with 3D culturing， in situ differentiated and transcriptome analysis， this study describes novel scaffolds and fabrication methods for cell cultured meat. The results showed that the effective space and utilization efficiency for cell culture of the scaffold is 26-1000 that of the traditional culture dish; it could form a tissue-like structure. Transcriptomics revealed the regulatory pathways and key factors of different cycles. It clarifies that the multi-cycle process of myoblast myogenesis in vitro is different from the single feedback regulation in vivo. More importantly， a novel scaffold-based cell cultured meat manufacturing method was developed， further develop a new tissue culture solution that is different from existing cell culture meat production.For manufacturing processes， it provides a new cell culture meat technology system， provides a theoretical basis for the regulation of cell proliferation and muscle growth， and lays the technical foundation for in situ tissue culture of cell cultured meat in vitro.

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Ultrahigh tensile strength achieved in a lightweight medium Mn steel via prominent work hardening

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Journal of Materials Science & Technology 2023年第14期145卷 156-164页

作者： Bin Hu Guohui Shen Zheng Wang shilei li Yandong Wang Haiwen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

We develop a new ultrastrong medium Mn steel with a density reduced to 7.39 g cm^(-3).It has a novel tri-phase microstructure comprising a hierarchical martensitic matrix(α’),dispersed ultra-fine-retained austenite grains(γ),and both compressed and{200}orientedδ-ferrite lamellas,the latter’s formation is due to the alloying of high Al and Si contents for reducing density.As a result,both ultrahigh ultimate tensile strength of 2.1 GPa and good ductility of 16%are achieved after an extraordinary plastic strain hardening increment of about 1.4 GPa.The in-situ synchrotron-based high-energy(HE)X-ray diffraction(XRD)examinations during the tensile deformation revealed that the initial presence of residual com-pressive stress inδ-ferrite could increase the stress required to initiate the plastic tensile deformation of the specimen,leading to the isolatedδ-ferrite lamellas mostly deformed elastically to coordinate the plastic deformation of the martensitic matrix during yielding.During the plastic deformation,the gradual release of residual compressive stress inδandα’,the dislocation multiplication in all the three phases and the successiveγ-to-α’transformation all contribute to such a prominent work hardening increment.This study facilitates the development of novel strategies for fabricating ultrastrong but light steels.

关键词： Medium mn steels Low density △-ferrite Strain hardening Transformation induced plasticity

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Geological cycling of potassium and the K isotopic response:insights from loess and shales

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Acta Geochimica 2019年第4期38卷 508-516页

作者： Weiqiang li shilei li Brian L.Beard State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210046People's Republic of China MOE Key Laboratory of Surficial Geochemistry School of Earth Sciences and EngineeringNanjing UniversityNanjing 210046People's Republic of China Department of Geoscience University of Wisconsin- Madison1215W Dayton StreetMadisonWI 53706USA NASA Astrobiology Institute University of Wisconsin- MadisonMadisonWI 53706USA

Shales are a major sink for K into seawater delivered from continental weathering,and are potential recorders of K cycling.High precision K isotope analyses reveal a[0.6%variation in δ^41K values(41K/39K relative to NIST SRM 3141a)from a set of well characterized postArchean Australian shale(PAAS)samples.By contrast,loess samples have relatively homogenous δ^41K values(-0.5±0.1%),which may represent the average K composition of upper continental crust.Most of the shales analyzed in this study have experienced K enrichment relative to average continental crust,and the majority of them define a trend of decreasing δ^41K value(from-0.5to-0.7%)with increasing K content and K/Na ratio,indicating cation exchange in clays minerals is accompanied by K isotope fractionation.Several shale samples do not follow the trend and have elevated δ^41K values up to-0.1%,and these samples are characterized by variable Fe isotope compositions,which reflect post-depositional processes.The K isotope variability observed in shales,in combination with recent findings about K isotope fractionation during continental weathering,indicates that K isotopes fractionate during cycling of K between different reservoirs,and K isotopes in sediments may be used to trace geological cycling of K.

关键词： K isotopes Loess Shale K cycle

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山脉隆升驱动硅酸盐风化机制研究进展

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高校地质学报 2024年第3期30卷 336-344页

作者：李石磊陈旸陈骏表生地球化学教育部重点实验室南京大学地球科学与工程学院南京210023 关键地球物质循环前沿科学中心南京大学南京210023

山脉隆升与气候变化的关系是近几十年来的研究热点。自20世纪80年代著名的“构造抬升驱动气候变冷”假说在提出以来,山脉隆升通过硅酸盐风化驱动百万年尺度气候变化的观点已深入人心。尽管许多大陆风化记录已经建立,但它们往往存在多解... 详细信息

山脉隆升与气候变化的关系是近几十年来的研究热点。自20世纪80年代著名的“构造抬升驱动气候变冷”假说在提出以来,山脉隆升通过硅酸盐风化驱动百万年尺度气候变化的观点已深入人心。尽管许多大陆风化记录已经建立,但它们往往存在多解性,难以直接验证该假说。这激发了大量从现代过程角度验证该假说的研究,但部分研究发现山地流域的风化不受物理剥蚀过程控制,因此不太可能响应构造活动而发生变化,与“构造抬升驱动气候变冷”假说的核心观点相矛盾。文章综述了山脉隆升驱动硅酸盐风化机制研究的相关进展并分析了这一矛盾产生的原因,探讨了异地风化作为解决该矛盾的新风化机制的可能性,并初步展望了异地风化研究领域的机遇和挑战。

关键词：地质碳循环大陆硅酸盐风化山脉隆升平原异地风化地表过程

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Fingerprinting hydrothermal fluids in porphyry Cu deposits using K and Mg isotopes

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Science China Earth Sciences 2020年第1期63卷 108-120页

作者： Weiqiang li Shugao ZHAO Xiaomin WANG shilei li Guoguang WANG Tao YANG Zhangdong JIN State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210046China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China

In this study, we performed an integrated investigation of K and Mg isotopes in hydrothermally altered rocks from the giant Dexing porphyry Cu deposit in China. Both the altered porphyry intrusion and the surrounding wall rocks exhibit large variations in K and Mg isotope compositions, with δ41K values ranging between-1.02‰ and 0.38‰, and δ26Mg values ranging between-0.49‰ and 0.32‰. The δ41K and δ26Mg values of the majority of altered samples are higher than the isotopic baseline values for upper continental crust. We attribute the general increase in δ41 K and δ26Mg in altered rocks to hydrothermal alteration,which caused preferential incorporation of heavy K and Mg isotopes in alteration products, particularly phyllosilicates. However,a few altered samples show anomalously low δ41K and δ26Mg values. The δ41K and δ26Mg values do not correlate with K and Mg concentrations, or mineralogy of altered samples. The variable K-Mg isotope data likely reflect fluids of different physicalchemical properties, or different isotopic compositions. Based on the combined K-Mg isotope data, at least three groups of hydrothermal fluids are distinguished from the Dexing porphyry deposit. Therefore, K-Mg isotopes are potentially a novel tracer for fingerprinting fluids in complex hydrothermal systems.

关键词： hydrothermal isotope alteration

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Deformation-induced martensitic transformation kinetics and correlative micromechanical behavior of medium-Mn transformation-induced plasticity steel

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Journal of Materials Science & Technology 2019年第8期35卷 1779-1786页

作者： Minghe Zhang Haiyang Chen Youkang Wang Shengjie Wang Runguang li shilei li Yan-Dong Wang Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing

An in situ high-energy X-ray diffraction(HE-XRD) technique was mainly used to investigate the micromechanical behavior of medium-Mn Fe-0.12 C-10.16 Mn-1.87 Al(in wt%) transformation-induced plasticit(TRIP) steel subjected to intercritical annealing at 625℃, 650℃, 675℃ and 700℃ for 1 h. As the intercritical annealing temperature increased, the volume fraction of retained austenite(RA) and ultimate tensilstress(UTS) increased, while the Lüders strain and yield stress(YS) decreased. The incremental workhardening exponent of experimental steel increased with increasing intercritical annealing temperatureThe overall trend of the transformation kinetics of the RA with respect to the true strain followed thsigmoidal shape predicted by the Olson and Cohen(OC) model. Load partitioning occurred among the ferrite, austenite and martensite immediately after entering the yielding stage. Because the stability of thRA decreased with increasing intercritical annealing temperature, the load undertaken by the martensitincreased. The moderate transformation kinetics of the RA and effective load partitioning among constituent phases were found to contribute to a favorable combination of strength and ductility for thimedium-Mn TRIP steel.

关键词： Medium-Mn TRIP steel High-energy X-ray diffraction Transformation kinetics Load partitioning

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Porcine skeletal muscle tissue fabrication for cultured meat production using three-dimensional bioprinting technology

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Journal of Future Foods 2021年第1期1卷 88-97页

作者： Yingying li Wenting liu shilei li Mingyue Zhang Feng Yang Shouwei Wang China Meat Research Center 100068 BeijingChina

Cultured meat produced through in vitro cell culture technology is regarded as a technical revolution.In this study,three-dimensional(3D)bioprinting technology was used to mimic the growth environment in vivo and construct a 3D culture system in vilro.Hydroge1 bioinks,namely,sodium alginate-gelatin and gelatin-methacrylate(GelMA)-silk fbroin,produced using two different curing processes were blended,and their rheological properties,mechanical properties,and biocompatibilities were compared.The 4%GelMA-20%silk fibroin hydroge1(GS2)demonstrated good performance and was hybridized with porcine skeleta1 muscle satellite cells for 3D printing to construct network structures of size 15 mm×15 mm and porosity 1000 um in 4-,6-,and 8-1ayer struchures.After 16 days of culture,4-and 6-1ayer grid structures formed compact muscle fbers organized by multinucleated myotubes.These results suggested that 3D bioprinting and GeIMA-silk fbroin hydrogels have great potential in fabricating porcine skeleta1 muscle tissue for use as cultured meat.

关键词： Culbured meat 3D bioprinting Hydroge1 bioinks GelMA-silk fbroin Mu1tinucleated myotubes

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金融领域大语言模型技术的发展研究及应用

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金融科技时代 2024年第7期32卷 12-16页

作者：李士雷郭超中国人民银行黑龙江省分行

随着时代的进步和科技的快速发展,大语言模型技术在各领域产品研发和业务运营等方面得到了广泛应用。在金融领域中,大语言模型技术能够促进金融业务智能化、高效化运行,为金融行业带来了全新的发展机遇。文章重点阐述了大语言模型技术... 详细信息

随着时代的进步和科技的快速发展,大语言模型技术在各领域产品研发和业务运营等方面得到了广泛应用。在金融领域中,大语言模型技术能够促进金融业务智能化、高效化运行,为金融行业带来了全新的发展机遇。文章重点阐述了大语言模型技术的发展历程、技术原理和应用现状,分析了大语言模型技术在应用过程中展现出的优势和面临的挑战,探讨并展望其在金融领域的应用前景。

关键词：大语言模型金融领域应用与发展

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