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Rapid design of secondary deformation-aging parameters for ultra-low Co content Cu-Ni-Co-Si-X alloy via Bayesian optimization machine learning

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International Journal of Minerals,Metallurgy and materials 2022年第6期29卷 1197-1205页

作者： Hongtao Zhang Huadong Fu Yuheng Shen Jianxin Xie Beijing advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China key laboratory for advanced materials processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China

It is difficult to rapidly design the process parameters of copper alloys by using the traditional trial-and-error method and simultaneously improve the conflicting mechanical and electrical properties.The purpose of this work is to develop a new type of Cu-Ni-Co-Si alloy saving scarce and expensive Co element,in which the Co content is less than half of the lower limit in ASTM standard C70350 alloy,while the properties are as the same level as C70350 alloy.Here we adopted a strategy combining Bayesian optimization machine learning and experimental iteration and quickly designed the secondary deformation-aging parameters(cold rolling deformation 90%,aging temperature 450℃,and aging time 1.25 h)of the new copper alloy with only 32 experiments(27 basic sample data acquisition experiments and 5 iteration experiments),which broke through the barrier of low efficiency and high cost of trial-and-error design of deformation-aging parameters in precipitation strengthened copper alloy.The experimental hardness,tensile strength,and electrical conductivity of the new copper alloy are HV(285±4),(872±3)MPa,and(44.2±0.7)%IACS(international annealed copper standard),reaching the property level of the commercial lead frame C70350 alloy.This work provides a new idea for the rapid design of material process parameters and the simultaneous improvement of mechanical and electrical properties.

关键词： copper alloy process design machine learning Bayesian optimization utility function

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Improving Cyclic Stability and Rate Performance of Lithium Ion Batteries Using La^(3+)Modified LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)Cathode materials

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Journal of Wuhan University of Technology(materials Science) 2023年第4期38卷 735-742页

作者：杜玉喆 RUAN Zhefei ZHANG Ruiming 张海宁 State key laboratory of advanced Technology for materials Synthesis and processing Wuhan University of TechnologyWuhan430070China Foshan Xianhu laboratory of the advanced Energy Science and Technology guangdong laboratory Foshan528200China

La_(4)NiLiO_(8)-coated NCM622 samples were prepared through a sol-gel method,and the electrochemical performance as cathode materials was investigated.It is revealed that part of the introduced La^(3+)ions produce a coating layer on the surface of NCM622 particles,while the rest occupy the 3b position of the lattice.The optimized sample exhibits a capacity retention of 96.54%after 100 cycles under 1C rate with a discharge specific capacity of 117.54 mAh·g^(-1)under 5C rate,much higher than those of the unmodified sample.The results show that the addition of La^(3+)ion can greatly improve the cyclic stability and the rate performance of NCM622.

关键词： lithium ion batter La^(3+)doping NCM622 cycling stability rate performance

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Cr-doped Na_(3)V_(2)(PO_(4))_(3)@C enables high-capacity with V^(2+)/V^(5+)reaction and stable sodium storage

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Journal of materials Science & Technology 2023年第34期165卷 1-7页

作者： Bo Mai Boyu Xing Yunfan Yue Nianyao Cai Congcong Cai Sitian Lian Hao Fan Mengyu Yan Ting Zhu Ping Hu Xuewen Wang Liqiang Mai State key laboratory of advanced Technology for materials Synthesis and processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu laboratory of the advanced Energy Science and Technology Guangdong LaboratoryFoshan 528216China

Due to its abundant sodium content and low cost,sodium-ion battery(SIB)has become an effective substitute and supplement for lithium-ion batteries,which has a broad development prospect in largescale energy storage systems.Na-super-ionic conductor(NASICON)structural materials have stable 3D skeleton structures and open Na+transport channels,which is a very promising SIB cathode material.But in the typical NASICON material Na_(3)V_(2)(PO_(4))_(3)(NVP),the number of electrons involved in NVP per formula unit is less than 2 at the stable voltage window,which limits the further improvement of battery performance.In this work,we report another NASICON structured Na_(3)V_(4/3)Cr_(2/3)(PO_(4))_(3)@C(NVCP@C),which is obtained by Cr-doped NVP through spray drying.By taking full advantage of the voltage platforms of V^(5+/4+),V^(4+/3+),and V^(3+/2+)in the window of 1.5-4.4 V,NVCP@C delivered a high discharge capacity(175 mAh g^(-1))and durable cyclability(86%capacity retention for 2000 cycles).In-situ X-ray diffraction results demonstrate that the reversible structural evolution accompanies by solid-solution reaction and two-phase reaction mechanisms co-exist during charge/discharge processes.When coupled with Na^(+)preembedded hard carbon(HC),the assembled NVCP@C//HC full cell delivers a high capacity(105 mAh g^(-1))and long cycling performance(70%after 1000 cycles).This Cr-doped NVP method offers new insights into the design of high-energy NASICON-structured cathode materials.

关键词： Sodium-ion batteries NASICON Na_(3)V_(4/3)Cr_(2/3)(PO_(4))_(3)@C Spray drying V^(2+)/V^(5+)reaction

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Microstructure and properties evolution of in-situ fiber-reinforced Ag-Cu-Ni-Ce alloy during deformation and heat treatment

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International Journal of Minerals,Metallurgy and materials 2022年第11期29卷 2000-2011页

作者： Xingqun He Huadong Fu Jianxin Xie Beijing advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China key laboratory for advanced materials processing(Ministry of Education) University of Science and Technology BeijingBeijing 100083China

Silver-based alloys are significant light-load electrical contact materials(ECMs).The trade-off between mechanical properties and electrical conductivity is always an important issue for the development of silver-based ECMs.In this paper,we proposed an idea for the regulation of the mechanical properties and the electrical conductivity of Ag-11.40Cu-0.66Ni-0.05Ce(wt%)alloy using in-situ composite fiber-reinforcement.The alloy was processed using rolling,heat treatment,and heavy drawing,the strength and electrical conductivity were tested at different deformation stages,and the microstructures during deformation were observed using field emission scanning electron microscope(FESEM),transmission electron microscope(TEM)and electron backscatter diffraction(EBSD).The results show that the method proposed in this paper can achieve the preparation of in-situ composite fiber-reinforced Ag-Cu-Ni-Ce alloys.After the heavy deformation drawing,the room temperature Vickers hardness of the as-cast alloy increased from HV 81.6 to HV 169.3,and the electrical conductivity improved from 74.3%IACS(IACS,i.e.,international annealed copper standard)to 78.6%IACS.As the deformation increases,the alloy strength displays two different strengthening mechanisms,and the electrical conductivity has three stages of change.This research provides a new idea for the comprehensive performance control of high-performance silver-based ECMs.

关键词： silver alloy electrical contact materials drawing in-situ fiber-reinforced

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Diffusion mechanism of immiscible Fe-Mg system induced by high-density defects at the steel/Mg composite interface

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Journal of materials Science & Technology 2023年第13期144卷 150-160页

作者： Yanlan Sun Xuefeng Liu Wenjing Wang Yaohua Yang Weiliang Zhang Beijing advanced Innovation Center for materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China key laboratory for advanced materials processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China

Due to positive mixing heat between Fe and Mg,it is difficult to diffuse for Fe-Mg at the interface of steel/Mg laminated composites,resulting in the inability to achieve high-strength metallurgical bonding.In this paper,20#steel/Mg laminated composites were prepared by large deformation rolling and subse-quent diffusion heat treatment process.The interfacial bonding strength was improved by constructing high-density crystal defects at the interface to promote element diffusion.The mechanisms of interface morphology evolution and element diffusion were analyzed by finite element simulation and theoretical calculation.The results show after diffusion heat treatment,the bond strength of the large deformation rolled interface was increased from 14 to 30 MPa.Fe-Mg transition layer with about 80 nm thickness as well as high-density vacancies,dislocations and grain boundaries were formed in the large deforma-tion rolled interface region.During diffusion heat treatment,Mg elements diffused into grain interior and grain boundary regions of 20#steel under the effect of heat-force coupling,and the thickness of Fe-Mg transition layer increased to 150 nm,forming an Fe-based supersaturated solid solution.The in-terface with high-density defects constituted a non-equilibrium interface.The 20#steel internal energy in the non-equilibrium interface is able to overcome positive mixing heat of immiscible Fe-Mg system and provide the driving force for Mg elements diffusion.Promoting elemental diffusion by constructing high-density defects can be a new concept to achieve metallurgical bonding at the interface of immiscible metal laminated composites.

关键词： Steel/Mg composite interface Immiscible Fe-Mg system Non-equilibrium interface Diffusion mechanism

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Microstructure and mechanical properties of as-cast(CuNi)100-xCox medium-entropy alloys

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China Foundry 2022年第6期19卷 511-518页

作者： Zhi-yong Yang Wei-ping Chen Liang-yan Hao Chen-liang Chu Da-hai Zeng Wei Xiong Zhi-qiang Fu guangdong key laboratory for advanced metallic materials processing South China University of TechnologyGuangzhou 510640China Physical Metallurgy and materials Design laboratory Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPittsburghPA15261USA National Engineering Research Center of Near-net-shape Forming for metallic materials South China University of TechnologyGuangzhou 510640China

Microstructure and mechanical properties of non-equiatomic(CuNi)_(100-x)Co_(x)(x=15,20,25 and 30,at.%)medium-entropy alloys(MEAs)prepared by vacuum arc-melting were investigated.Results show that all the as-cast MEAs exhibit dual face-centered cubic(fcc)solid-solution phases with identical lattice constant,showing typical dendrite structure consisting of(Ni,Co)-rich phase in dendrites and Cu-rich phase in inter-dendrites.The positive enthalpy of mixing among Cu and Ni-Co elements is responsible for the segregation of Cu.With the increase of Co content,the volume fraction of(Ni,Co)-rich phase increases while the Cu-rich phase decreases,resulting in an increment of yield strength and a decrement of elongation for the(CuNi)_(100-x)Co_(x) MEAs.Nano-indentation test results show a great difference of microhardness between the two fcc phases of the MEAs.The measured microhardness value of the(Ni,Co)-rich phase is almost twofold as compared to that of the Cu-rich phase in all the(CuNi)_(100-x)Co_(x) MEAs.During the deformation of the MEAs,the Cu-rich phase bears the main plastic strain,whereas the(Ni,Co)-rich phase provides more pronounced strengthening.

关键词： medium-entropy alloys microstructure mechanical properties nano-indentation

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Research progress on selective laser melting processing for nickel-based superalloy

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International Journal of Minerals,Metallurgy and materials 2022年第3期29卷 369-388页

作者： Maohang Zhang Baicheng Zhang Yaojie Wen Xuanhui Qu Beijing advanced Innovation Center materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and processing for Modern Transportation Beijing 100083China

Selective laser melting(SLM),an additive manufacturing process mostly applied in the metal material field,can fabricate complex-shaped metal objects with high precision.Nickel-based superalloy exhibits excellent mechanical properties at elevated temperatures and plays an important role in the aviation industry.This paper emphasizes the research of SLM processed Inconel 718,Inconel 625,CM247LC,and Hastelloy X,which are typical alloys with different strengthening mechanisms and operating temperatures.The strengthening mechanism and phase change evolution of different nickel-based superalloys under laser irradiation are discussed.The influence of laser parameters and the heat-treatment process on mechanical properties of SLM nickel-based superalloys are systematically introduced.Moreover,the attractive in-dustrial applications of SLM nickel-based superalloy and printed components are presented.Finally,the prospects for nickel-based superalloy materials for SLM technology are presented.

关键词： selective laser melting nickel-based superalloy mechanical property

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Simultaneous enhancement in mechanical and corrosion properties of Al-Mg-Si alloys using machine learning

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Journal of materials Science & Technology 2023年第36期167卷 1-13页

作者： Xinming Feng Zhilei Wang Lei Jiang Fan Zhao Zhihao Zhang Institute for advanced materials and Technology University of Science and Technology BeijingBeijing 100083China Beijing laboratory of metallic materials and processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China key laboratory for advanced materials processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Al-Mg-Si alloys with high strength and good corrosion resistance are regarded as desirable materials for all-aluminum vehicles.However,the traditional trial-and-error experimental methods are insufficient to address the trade-offbetween strength and corrosion resistance.In this work,a non-dominated sorting genetic machine-learning algorithm(NSGA-II)was employed to optimize the chemical composition,so as to simultaneously improve the strength and corrosion resistance.Three high-performance Al-Mg-Si alloys with low Mg,Si,and Cu contents were successfully developed,where the yield strength(YS),ultimate tensile strength(UTS),and the elongation(δ)reached 375-380 MPa,410-416 MPa,and 13.7%-15.2%,re-spectively.Compared with higher-Cu-content 6013 alloy,the YS and UTS of the present alloys increase by about 60 MPa,and the intergranular corrosion resistance is also significantly improved.Microstruc-ture characterization demonstrated thatβ’’and QP phases introduced a significant synergistic precipita-tion strengthening effect;the dispersoids formed by trace Mn,Cr,Fe,Zr,and Ti contributed dispersion strengthening effect;and the good pitting corrosion resistance is attributed to lower Mg and Si contents.

关键词： Aluminum alloy Machine learning High strength Corrosion resistance

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Abnormal low-field M-type magnetoresistance in hexagonal noncollinear ferromagnetic MnFeGe alloy

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Rare Metals 2022年第8期41卷 2680-2687页

作者： Jia-Xuan Tang Pei-Hao Wang Yu-Rong You Ya-Dong Wang Zhan Xu Zhi-Peng Hou Hong-Guo Zhang Gui-Zhou Xu Feng Xu MIIT key laboratory of advanced metallic and Internetallic materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China guangdong Provincial key laboratory of Quantum Engineering and Quantum materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China Faculty of materials and Manufacturing Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing100124China

The new magnetic degree of freedom provided by the noncollinear structure plays an important role in the development of spintronic devices.In this work,we conducted a systematic study on the magnetic and electrical transport properties of the hexagonal noncollinear ferromagnetic MnFeGe alloy.Abnormal Hall effect and moderate magnetoresistance(MR)were observed below the Curie temperature(~200 K)of MnFeGe,in both bulk and thin-film forms.Notably,the perpendicular MR in all samples firstly grows,then quasi-linearly descends with magnetic field increasing,making an irregular M-type MR in the low-field region.It is speculated that the abnormal MR is related to the magnetic domain change,and combined with micromagnetic simulations,the labyrinth domain and sparse bubble formation are verified to exist in MnFeGe.Our work offers an understanding of the lowfield-positive MR in a ferromagnet,as well as raises the possibility of magnetic bubble formation in this noncollinear system.

关键词： M-type magnetoresistance Noncollinear MnFeGe Skyrmionic bubbles

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Mn-based MXene with high lithium-ion storage capacity

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Nano Research 2024年第5期17卷 4181-4191页

作者： Yanyan Wu Dongqing Liu Xiaonan Wang Usman Ghani Muhammad Asim Mushtaq Jinfeng Yang Huarui Sun Panagiotis Tsiakaras Xingke Cai School of Science and Ministry of Industry and Information Technology key laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 5180552 China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Institute for advanced Study Shenzhen UniversityShenzhen 518060China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China laboratory of Alternative Energy Conversion Systems Department of Mechanical EngineeringSchool of EngineeringUniversity of ThessalyPedion Areos 38834Greece

3d-transition metal(Fe,Co,Ni,and Mn)-based MXene materials have been predicted to demonstrate exceptional electrochemical performance because of their good electrical conductivity and the presence of metallic atoms with multiple charge states.However,until now,there have been no reports on MXenes based on Fe,Co,Ni,and Mn,due to the lack of 3d-metal-layered precursors.Herein,we successfully synthesized the first 3d-transition metal-based MXenes,Mn_(2)CT_(x) by exfoliating a layered precursor derived from the anti-perovskite bulk Mn3GaC.The as-prepared Mn_(2)CT_(x) MXene nanosheets were employed as anode materials in lithium-ion batteries,which exhibited stable storage capacity of 764.7 mAh·g^(-1) at 0.5 C,placing its storage capacities at an upper-middle level compared with other reported MXene materials as well as other Mn-based anode materials.Overall,this study opens a new avenue for MXene research by synthesizing 3d-transition metal-based MXenes for electrochemical applications.

关键词： Mn_(3)GaC Mn_(2)CT_(x) MXenes lithium-ion battery anode materials negative fading capacity

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