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Automating selective area electron diffraction phase identification using machine learning

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Journal of Materiomics 2024年第4期10卷 896-905页

作者： M.Mika N.Tomczak C.Finney J.Carter A.Aitkaliyeva Nuclear Engineering Program in Department of Materials Science University of Florida100 Rhines HallGainesville32611FLUSA Department of Materials Science&Engineering Case Western Reserve University2111 Martin Luther King Jr DrCleveland44106OHUSA

Selective area electron diffraction(SAED)patterns can provide valuable insight into the structure of a ***,the manual identification of collected patterns can be a significant bottleneck in the overall phase classification *** this work,we utilize the recent advances in computer vision and machine learning(ML)to automate the indexing of SAED *** performance of six different ML algorithms is demonstrated using metallic plutonium-zirconium *** most successful approach trained a neural network(NN)to make a classification of the phase and zone axis,and then utilized a second NN to synthesize multiple independent predictions of different tilts in a single sample to make an overall phase *** results demonstrate that automated SAED phase identification using ML is a viable route to accelerate materials characterization.

关键词： Selective area electron diffraction Machine learning phase identification Metallic fuels Pu alloys

phase composition, transition and structure stability of functionally graded cemented carbide with dual phase structure

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Journal of Central South University of Technology 2007年第2期14卷 149-152页

作者：张立陈述熊湘君贺跃辉黄伯云张传福 State Key Laboratory of Powder Metallurgy Central South University Changsha Mining and Metallurgy Research Institute School of Metallurgical Science and Engineering Central South University

The phase composition, phase transition and phase structure transformation of the wire-cut section of functionally graded WC-Co cemented carbide with dual phase structure were investigated by XRD phase analysis. It is shown that the composition of η phase in the core zone is Co_3W_3C (M_6 C type). The structure of cobalt based solid solution binder phase is fcc type. At the cooling stage of the sintering process, the phase transition of η phase, i.e. M_6C→M_12C and the martensitic phase transition of the cobalt based solid solution binder phase, i.e. fcc→hcp are suppressed, which facilitates the strengthening of the alloy. Because the instantaneous temperature of the discharge channel is as high as 10 000 ℃ during the wire cutting process, the processed surface is oxidized. Nevertheless, the oxide layer thickness is in micro grade. In the oxide film, η phase is decomposed into W_2C and CoO, and cobalt based solid solution binder is selectively oxidized, while WC remains stable due to the existence of carbon containing liquid organic cutting medium.

关键词： cemented carbide dual phase structure functionally graded material phase identification fracture toughness testing

Automated identification of Ordered phases for Simulation Studies of Block Copolymers

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Chinese Journal of Polymer Science 2024年第5期42卷 683-692,I0011页

作者： Yu-Chen Zhang Wei-Ling Huang Yi-Xin Liu State Key Laboratory of Molecule Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

In unit cell simulations,identification of ordered phases in block copolymers(BCPs)is a tedious and time-consuming task,impeding the advancement of more streamlined and potentially automated research *** this study,we propose a scattering-based automated identification strategy(SAIS)for characterization and identification of ordered phases of BCPs based on their computed scattering *** approach leverages the scattering theory of perfect crystals to efficiently compute the scattering patterns of periodic morphologies in a unit *** the first stage of the SAIS,phases are identified by comparing reflection conditions at a sequence of Miller *** confirm or refine the identification results of the first stage,the second stage of the SAIS introduces a tailored residual between the test phase and each of the known candidate ***,our strategy incorporates a variance-like criterion to distinguish background species,enabling its extension to multi-species BCP *** has been demonstrated that our strategy achieves exceptional accuracy and robustness while requiring minimal computational ***,the approach allows for real-time expansion and improvement to the candidate phase library,facilitating the development of automated research workflows for designing specific ordered structures and discovering new ordered phases in BCPs.

关键词： Block copolymer phase identification Scattering function

Investigation of the isothermal section of the Ce-Co-Al ternary system at 573 K

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Journal of Rare Earths 2011年第7期29卷 650-653页

作者：姚青荣周怀营唐成颖潘顺康 School of Materials Science and Engineering Guilin University of Electronic Technology School of Materials Science and Engineering Central South University

The isothermal section of the Ce-Co-Al ternary system at 573 K was investigated by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS） techniques. It consisted of 19 single-phase regions, 46 two-phase regions and 25 three-phase regions. Four ternary compounds, namely CeCoAl, Ce2Co15Al2, CeCoAl4, CeCo2Al8, were confirmed in this system. At 573 K, the maximum solid solubilities of Co in CeAl2 and Al in CeCo2 were about 10.4 at.% and 10.0 at.%, respectively. The homogeneity range of CoAl phase extended from about 46.0 to 56.0 at.% Al.

关键词： rare-earth alloys X-ray diffraction phase identification electron microscopy

Atomic-scale investigation of precipitate phases in QE22 Mg alloy

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Journal of Materials Science & Technology 2024年第10期177卷 114-127页

作者： Xiaojun Zhao Zhiqiao Li Aiping Zhang Longlong Hao Houwen Chen Jian-Feng Nie Key Laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia

Precipitation-hardenable commercial Mg alloy QE22(***-0.7Zr,wt.%)has excellent mechan-ical properties,but precipitates in this alloy have not been well *** this work,precipitate phasesγ",γ,andδformed during the isothermal ageing process at 150,200,250,and 300℃have been characterized using atomic-resolution high-angle annular dark-field scanning transmission electron mi-croscopy and atomic-scale energy-dispersive X-ray *** morphology,crystal structure,and orientation relationship of these precipitate phases have been *** boundaries usually exist in a singleγparticle,which can be characterized by a separation vector of[1(1)01]_(α).Theδphase forms in situ from its precursorγphase,consequently leading to the formation of three different variants within a single 8 *** nucleation of theδphase is strongly related to the domain boundaries of the y *** formation of theγphase may be promoted by its precursorγ"*** similarities in atomic structures of theγ",γ,andδphases are described and discussed,indicating that transfor-mations between these precipitate phases can be accomplished through the diffusion of added alloying elements.

关键词： Magnesium alloy Precipitation phase identification phase transformation Electron microscopy

identification of Crystalline phases in Toothpaste byPowder Diffractometry

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Rare Metals 1996年第2期15卷 128-131页

作者：沙维 The Queen's University of Belfast 英国

The abrasive crystalline phases in Colgate Regular, Aquafresh , and Macleans tcothpaste were identifiedby X-ray powder diffractometry to be calcium ortho-phaphate hydrate (CaHPO_4 . 2H_2O),calcite (CaCO_3) ,and aragon... 详细信息

关键词： Toothpaste phase identification X-ray diffraction techniques

Research on pre-synchronization control strategy of the micro-grid with multi-VSG

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Global Energy Interconnection 2018年第3期1卷 376-381页

作者： Tao Yan Cairan Wang Zong Liu Shaohua Xu Yu Ba Juntao Fei Jerry Y.S.Lin State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing Jiaotong University Zhenjiang Power Supply Company Electric Power Research Institute of State Grid Jiangsu Electric Power Co.LTD Arizona State University

Seamless switching is an important guarantee for the inverter to work continuously without stopping when gridconnected power generation system is the transient process from grid-connected to isolated island and from isolated island reclosing. Based on the principle of pre-synchronous operation of traditional synchronous generators, this paper analyzes the principle of pre-synchronous process and its effect on the steady-state of micro grid with multiple virtual synchronous generators. At the same time, the paper analyzes the transient influence of the closed pre-synchronous switch on the power distribution of the micro grid under different phase modes. This paper proposes a pre-synchronous control strategy based on phase recognition. MATLAB/Simulink simulation software is used to verify the correctness and validity of the proposed method.

关键词： Virtual synchronous generator(VSG) Power allocation Pre-synchronization phase identification

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Smart Meter Data Analytics for Distribution Network

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Smart Meter Data Analytics for Distribution Network