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Thermo-kinetic characteristics on stabilizing hetero-phase interface of metal matrix composites by crystal plasticity finite element method

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Journal of Materials Science & Technology 2024年第2期169卷 53-67页

作者： Y.B.Zhang S.J.Song F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China

Using dislocation-based constitutive modeling in three-dimension crystal plasticity finite element(3D CPFE)simulations,co-deformation and instability of hetero-phase interface in different material systems were herein studied for polycrystalline metal matrix composites(MMCs).Local stress and strain fields in two types of 3layer MMCs such as fcc/fcc Cu-Ag and fcc/bcc Cu-Nb have been predicted under simple compressive ***,more severe strain-induced interface instability can be observed in the fcc/bcc systems than in the fcc/fcc systems upon refining to metallic nanolayered composites(MNCs).By detailed analysis of stress and strain localization,it has been demonstrated that the interface instability is always accompanied by high-stress concentration,i.e.,thermodynamic characteristics,or high strain prevention i.e.,kinetic characteristics,at the hetero-phase *** then follows that the thermodynamic driving forceG and the kinetic energy barrier Q during dislocation and shear banding can be adopted to classify the deformation modes,following the so-called thermo-kinetic *** by inserting a high density of high-energy interfaces into the Cu-Nb composites,such thermo-kinetic integration at the hetero-phase interface allows a successful establishment of MMCs with the high△G-high Q deformation mode,which ensures high hardening and uniform strain distri-bution,thus efficiently suppressing the shear band,stabilizing the hetero-phase interface,and obtaining an exceptional combination in strength and *** hetero-phase interface chosen by a couple of thermodynamics and kinetics can be defined as breaking the thermo-kinetic correlation and has been proposed for artificially designing MNCs.

关键词： Thermodynamics and kinetics Physics-based constitutive modeling Hetero-phase interface crystal plasticity finite element

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Effects of subgrain size and static recrystallization on the mechanical performance of polycrystalline material: A microstructure-based crystal plasticity finite element analysis

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Progress in Natural Science:Materials International 2015年第1期25卷 58-65页

作者： Fengbo Han Bin Tang Hongchao Kou Jinshan Li Yong Feng State Key Laboratory of Solidification Processing Northwestern Polytechnical University Western Superconducting Technologies Co. Ltd.

In this paper, the effects of subgrain size and static recrystallization on the mechanical performance of polycrystalline material were investigated using a microstructure-based crystal plasticity finite element(CPFE) model. Firstly, polycrystalline microstructures with different mean subgrain sizes were prepared using simple assumption based on experimental observations, and intermediate microstructures during static recrystallization(SRX) were simulated by a cellular automata model adopting curvature driven grain/subgrain growth mechanism. Then, CPFE method was applied to perform stress analysis of plane strain tension on these virtual microstructures. The results show that the subgrains inside pre-existing grains have an effect on the heterogeneity of the stress distributions. The average stress decreases with increasing the mean subgrain radius. As grain/subgrain grows during SRX, the average stress also decreases. It can be deduced that well-defined and finer subgrain structure may strengthen the polycrystalline material, while grain/subgrain growth during SRX process will degrade the strength.

关键词： Static recrystallization Subgrain growth Cellular automata crystal plasticity finite element Stress analysis

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Mechanical Anisotropy of Selective Laser Melted Ti-6Al-4V Using a Reduced-order crystal plasticity finite element Model

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第1期2卷 67-78页

作者： Yang Liu Feng Yu Yonggang Wang Key Laboratory of Impact and Safety Engineering of Ministry of Education Ningbo UniversityNingbo315211China Department of Mechanical Engineering Ningbo University of TechnologyNingbo315211China

In this study,a reduced-order crystal plasticity finite element(CPFE)model was developed to study the effects of the microstructural morphology and crystallographic texture on the mechanical anisotropy of selective laser melted(SLMed)***,both hierarchical and equiaxed microstructures in columnar prior grains were modeled to examine the influence of the microstructural morphology on mechanical ***,the effects of crystallographic anisotropy and textural variability on mechanical anisotropy were investigated at the granular and representative volume element(RVE)scales,*** results show that hierarchical and equiaxed CPFE models with the same crystallographic texture exhibit the same mechanical *** the granular scale,the significance of crystallographic anisotropy varies with different crystal *** indicates that the present SLMed Ti-6Al-4V sample with weak mechanical anisotropy resulted from the synthetic effect of crystallographic anisotropies at the granular ***,combinations of various crystallographic textures were applied to the reduced-order CPFE model to design SLMed Ti-6Al-4V with different mechanical ***,the crystallographic texture is considered the main controlling variable for the mechanical anisotropy of SLMed Ti-6Al-4V in this study.

关键词： Selective laser melting Ti-6Al-4V Mechanical anisotropy Microstructure morphology crystallographic texture crystal plasticity finite element

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Temperature-dependent constitutive modeling of a magnesium alloy ZEK100 sheet using crystal plasticity models combined with in situ high-energy X-ray diffraction experiment

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Journal of Magnesium and Alloys 2022年第10期10卷 2801-2816页

作者： Hyuk Jong Bong Xiaohua Hu Xin Sun Yang Ren Materials Deformation Department Korea Institute of Materials ScienceChangwonGyeongnam 51508South Korea Energy and Transportation Science Division Oak Ridge National LaboratoryOak RidgeTN 37831USA X-ray Science Division Argonne National LaboratoryIL 60439USA

A multiscale crystal plasticity model accounting for temperature-dependent mechanical behaviors without introducing a larger number of unknown parameters was *** model was implemented in elastic-plastic self-consistent(EPSC)and crystal plasticity finite element(CPFE)frameworks for grain-scale simulations.A computationally efficient EPSC model was first employed to estimate the critical resolved shear stress and hardening parameters of the slip and twin systems available in a hexagonal close-packed magnesium alloy,*** constitutive parameters were thereafter refined using the *** crystal plasticity frameworks incorporated with the temperature-dependent constitutive model were used to predict stress–strain curves in macroscale and lattice strains in microscale at different testing temperatures up to 200℃.In particular,the predictions by the crystal plasticity models were compared with the measured lattice strain data at the elevated temperatures by in situ high-energy X-ray diffraction,for the first *** comparison in the multiscale improved the fidelity of the developed temperature-dependent constitutive model and validated the assumption with regard to the temperature dependency of available slip and twin systems in the magnesium ***,this work provides a time-efficient and precise modeling scheme for magnesium alloys at elevated temperatures.

关键词： High-energy X-ray diffraction crystal plasticity finite element Elastic-plastic self-consistent model Twin Temperature

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Phase field simulation of the stress-inducedαmicrostructure in Ti–6Al–4 V alloy and its CPFEM properties evaluation

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Journal of Materials Science & Technology 2021年第31期90卷 168-182页

作者： Jinhu Zhang Xuexiong Li Dongsheng Xu Chunyu Teng Hao Wang Liang Yang Hongtao Ju Haisheng Xu Zhichao Meng Yingjie Ma Yunzhi Wang Rui Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China China Aero-Polytechnology Establishment Beijing 100028China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Department of Materials Science and Engineering The Ohio State University2041 Collesnited States

Variant selection under specific applied stresses during precipitation of a plates from prior-βmatrix in Ti-6 Al-4 V was investigated by 3 D phase field *** model incorporates the Burgers transformation path fromβto a phase,with consideration of interfacial energy anisotropy,externally applied stresses and elastic interactions among a variants andβ*** Gibbs free energy and atomic mobility data are taken from available thermodynamic and kinetic *** was found that external stresses have a profound influence on variant selection,and the selection has a sensitive dependence,as evidenced by both interaction energy calculations and phase field *** with normal stresses,shear stresses applied in certain directions were found more effective in accelerating the transformation,with a stronger preference to fewer *** volume fractions of various a variants and the final microstructure were determined by both the external stress and the elastic interaction among different *** a clusters formed by variants with Type2 misorientation([11-20]/60°)relation were found more favored than those with Type4([-1055-3]/63.26°)under certain applied tensile stress such as alongβ.The mechanical properties of different microstructures from our phase field simulation under different conditions were calculated for different loading conditions,utilizing crystal plastic finite element *** mechanical behavior of the various microstructures from phase field simulation can be evaluated well before the alloys are fabricated,and therefore it is possible to select microstructure for optimizing the mechanical properties of the alloy through thermomechanical processing based on the two types of simulations.

关键词： Titanium alloy Phase transformation Microtexture Mechanical evaluation Phase field crystal plasticity finite element

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Heterogeneous precipitate microstructure in titanium alloys for simultaneous improvement of strength and ductility

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Journal of Materials Science & Technology 2022年第29期124卷 150-163页

作者： Mengyuan Hao Pei Li Xuexiong Li Tianlong Zhang Dong Wang Qiaoyan Sun Libin Liu Jinshan Li Yuyou Cui Rui Yang Dongsheng Xu Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Thermal Power Research Institute Co.Ltd. Xi’an 710032China

The design of alloys with simultaneous high strength and high ductility is still a difficult ***,we propose a new approach to designing multi-phase alloys with a synergistic combination of strength and ductility by engineering heterogeneous precipitate microstructures through the activation of different transformation *** a two-phase titanium alloy as an example,phase field simulations are carried out firstly to design heat treatment schedules that involve both conventional nucleation and growth and non-conventional pseudospinodal decomposition mechanisms,and the calculated microstructures have been evaluated by crystal plasticity finite element *** to simulations,we then set a two-step heat treatment to produce bimodalα+βmicrostructure in *** mechanical testing shows that the ductility of the alloy is increased by~50%and the strength is increased by~10%as compared to its unimodal *** work may provide a general way to improve the mechanical properties of alloys through multiscale microstructure design.

关键词： Titanium alloys Phase field simulation crystal plasticity finite element Two-step aging Pseudospinodal decomposition mechanisms Multiscale heterogeneous microstructure

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Nanomanufacturing and Metrology 2020年第2期3卷 123-132页

作者： Zhanfeng Wan Junjie Zhang Guo Li Zongwei Xu Haijun Zhang Jianguo Zhang Alexander Hartmaier Fengzhou Fang Yongda Yan Tao Sun Center for Precision Engineering.Harbin Institute of Technology Harbin 150001People's Republic of China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900People's Republic of China State Key Laboratory of Precision Measuring Technology&Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University Bochum44780 BochumGermany

Deformation behavior at grain levels greatly affects the machining characteristics of crystalline *** the present work,we investigate the influence of material anisotropy on ultra-precision diamond cutting of single crystalline and polycrystalline copper by experiments and crystal plasticity finite element ***,diamond turning and in situ SEM orthogonal cutting experiments are carried out to provide direct experimental evidence of the material anisotropy-dependent cutting results in terms of machined surface morphology and chip *** numerical simulations with the analysis of built stress further validate experimental results and reveal the mechanisms governing the material anisotropy *** above findings provide insight into the fabrication of ultra-smooth surfaces of polycrystalline metals by ultraprecision diamond turning.

关键词： Diamond cutting Polycrystalline copper Anisotropy Grain boundary crystal plasticity finite element

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