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The Influence of crystallographic orientation and Grain Boundary on Nanoindentation Behavior of Inconel 718 Superalloy Based on Crystal Plasticity Theory

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 385-396页

作者： Wenbo Zhu Guangjian Yuan Jianping Tan Shuai Chang Shantung Tu MOE Key Laboratory of Pressure Systems and Safety East China University of Science and TechnologyShanghai 200237China

The crystal plasticity finite element method(CPFEM)is widely used to explore the microscopic mechanical behavior of materials and understand the deformation mechanism at the ***,few CPFEM simulation studies have been carried out to analyze the nanoindentation deformation mechanism of polycrystalline materials at the microscale *** this study,a three-dimensional CPFEM-based nanoindentation simulation is performed on an Inconel 718 polycrystalline material to examine the influence of different crystallographic parameters on nanoindentation behavior.A representative volume element model is developed to calibrate the crystal plastic constitutive parameters by comparing the stress-strain data with the experimental *** indentation force-displacement curves,stress distributions,and pile-up patterns are obtained by CPFEM *** results show that the crystallographic orientation and grain boundary have little influence on the force-displacement curves of the nanoindentation,but significantly influence the local stress distributions and shape of the pile-up *** the difference in crystallographic orientation between grains increases,changes in the pile-up patterns and stress distributions caused by this effect become more *** addition,the simulation results reveal that the existence of grain boundaries affects the continuity of the stress *** obstruction on the continuity of stress distribution increases as the grain boundary angle *** research demonstrates that the proposed CPFEM model can well describe the microscopic compressive deformation behaviors of Inconel 718 under nanoindentation.

关键词： Crystal plasticity Grain boundary crystallographic orientation Nanoindentation

Analysis of crystallographic orientation and morphology of microstructure during hot working for an alpha/beta titanium alloy

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Journal of Materials Science & Technology 2020年第24期59卷 1-13页

作者： Jianwei Xu Weidong Zeng Dadi Zhou Wei Chen Shengtong He Xiaoyong Zhang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China Defense Technoloies Innovation Center of Precision Forging and Ring Rolling School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

This work focuses on analysis of microstructure morphology and crystallographic orientation for Ti-17 alloy during hot *** results show that alpha phase and beta phase influence each other and there is a coordinate deformation between *** non-uniform deformation is observed under small deformation *** observing area can be divided into small deformation zone(area L)and large deformation zone(area H).Both alpha and beta phases remain the initial morphology,and they have better capability of coordinate deformation in area L,while coordinate capability is weak in area H in which alpha phase is ***,the Burgers orientation relations are well preserved in area L,but the orientation relations are more or less destroyed in area *** recovery is the main mechanism of beta phase evolution when height reduction is *** contrast,the continuous dynamic recrystallization(CDRX)of beta phase gradually dominates the deformation pattern as the deformation *** uniformly globularized alpha structure is obtained under large deformation *** unsynchronized rotation of alpha phase aroundpole occurs during deformation,which leads to the uniform crystal structure inside the same alpha *** process is an important step of globularization of the lamellar structure.

关键词： Ti-17 alloy Hot working Microstructure evolution crystallographic orientation

Influence of strain rate and crystallographic orientation on dynamic recrystallization of pure Zn during room-temperature compression

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Journal of Materials Science & Technology 2021年第27期86卷 237-250页

作者： Shiyang Liu Damon Kent Hongyi Zhan Nghiem Doan Chang Wang Sen Yu Matthew Dargusch Gui Wang Queensland Centre for Advanced Materials Processing and Manufacturing School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQLD4072Australia ARC Research Hub for Advanced Manufacturing of Medical Devices The University of QueenslandBrisbaneQLD4072Australia School of Science Technology and EngineeringUniversity of the Sunshine CoastMaroochydore DCQLD4558Australia China Science Lab General Motors Global Research&Development56 Jinwan RoadShanghai201206China School of Dentistry and Oral Health Griffith UniversityGold CoastQLD4215Australia Northwest Institute for Nonferrous Metal Research Shanxi Key Laboratory of Biomedical Metal Materials96 Weiyang RoadXi’an710016China

This work investigates the strain rate dependence of dynamic recrystallization behaviour of high-purity zinc in room temperature compression under strain rates of 10^(-4)s^(-1),10-2s^(-1)and 0.5 s^(-1).Results from electron backscatter diffraction provide insight into the deformation and dynamic recrystallization mechanisms *** dynamic recrystallization,twin-induced dynamic recrystallization,and discontinuous dynamic recrystallization are all active under compressive deformation at room *** to the high stacking fault energy of Zn,continuous dynamic recrystallization is the dominant mechanism while discontinuous dynamic recrystallization only operates in the early stages of compression at 10^(-4)s^(-1).Dynamic recrystallization kinetics are enhanced at higher strain rates(10^(-2)s^(-1)and 0.5s^(-1))due to an increased contribution from twin-induced dynamic *** present study reveals that the controlling mechanisms for continuous dynamic recrystallization are basalslip and 2ndorder pyramidalslip *** the activation of slip systems is mainly determined by crystallographic orientation,continuous dynamic recrystallization behaviour varies with grain orientation according to their propensity for basal and 2ndorder pyramidal slip.

关键词： Zinc Dynamic recrystallization crystallographic orientation Schmid factor EBSD

Influence of crystallographic orientation on growth behavior of spherical voids

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Journal of Central South University of Technology 2008年第2期15卷 159-164页

作者：张新明刘文辉唐建国叶凌英 School of Materials Science and Engineering Central South University

The influence of crystallographic orientation on the void growth in FCC crystals was numerically simulated with 3D crystal plasticity finite element by using a 3D unit cell including a spherical void, and the rate-dependent crystal plasticity theory was implemented as a user material subroutine. The results of the simulations show that crystallographic orientation has significant influence on the growth behavior of the void. Different active slip systems of the regions around the void cause the discontinuity in lattice rotation around the void, and the corner-like region is formed. In the case of the void located at grain boundary, large heterogeneous deformation occurs between the two grains, and the equivalent plastic deformation along grain boundary near the void in the case of θ=45^o （θ is the angle between grain boundary direction and X-axis） is larger than the others. Large difference of orientation factor of the two grains leads to large equivalent plastic deformation along grain boundary, and the unit cell is more likely to fail by intergranular fracture.

关键词： crystallographic orientation void growth crystal plasticity user subroutine finite element method

Development of 3D crystallographic orientation measurement for grain deformation analysis in aluminum alloy

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2094-2101页

作者： M.KOBAYASHI H.TODA D.J.LECLERE T.KAMIKO K.UESUGI A.TAKEUCHI Y.SUZUKI Department of Mechanical Engineering Toyohashi University of Technology Department of Mechanical Engineering Kyushu University Japan Synchrotron Radiation Research Institute

Development of inhomogeneous deformation is an interest matter in material engineering. Synchrotron radiation tomography provides 3D distribution map of local strain in polycrystalline aluminum alloy by tracking microstructural features. To perform further deep analysis on development of inhomogeneous deformation, crystallographic grain orientation is necessary. Three-dimensional X-ray diffraction technique was developed. A new crystallographic orientation measurement method was described in 3D space, utilizing grain boundary tracking （GBT） information.

关键词： synchrotron radiation X-ray tomography X-ray diffraction plastic deformation crystallographic orientation

Influence of Defects and crystallographic orientation on Mechanical Behavior of Nanocrystalline Aluminium

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Communications in Theoretical Physics 2016年第10期65卷 431-438页

作者： Jun Cai Qiong Dengl Min-Rong An Hai-Yang Song Meng-Jia Su School of Aeronautics Northwestern Polytechnical University Xi＇an 710072 China Department of Mechanical Engineering University of North Carolina at Charlotte North Carolina 28223 USA College of Materials Science and Engineering Xi＇an Shiyou University Xi＇an 710065 China

Simulation of molecular dynamics using Embedded Atom Method(EAM) potentials is performed to investigate the mechanical properties of single crystal Al along various crystallographic orientations under tensile *** specimens are provided with one or two embedded circular voids to analyze the damage evolution by void growth and *** simulation result shows that the Young's modulus,yielding stress and ultimate stress decrease with the emergence of the ***,the simulations show that the single-crystal Al in different crystallographic orientations behaves differently in elongation *** single-crystal Al with 100 crystallographic orientations has greater ductility than other orientated *** incipient plastic deformation and the stress-strain curves are presented and discussed for further understanding of the mechanical properties of single-crystal Al.

关键词： void crystallographic orientation dislocation molecular dynamics simulation

Anisotropy of the crystallographic orientation and corrosion performance of high-strength AZ80 Mg alloy

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Journal of Magnesium and Alloys 2015年第4期3卷 309-314页

作者： Quantong Jiang Xiumin Ma Kui Zhang Yantao Li Xinggang Li Yongjun Li Minglong Ma Baorong Hou Marine Corrosion and Protection Centre Institute of OceanologyChinese Academy of SciencesNo.7 Nanhai RoadQingdao 266071China State Key Lab for Non-ferrous Metals and Process General Research Institute for Non-Ferrous MetalsBeijing 100088China

A high-strength AZ80 Mg alloy was prepared through multi-direction forging,thermal extrusion,and peak-aged heat *** microstructure,crystallographic orientation and corrosion performance of extrusion-direction,transverse-direction,and normal-direction specimens were investigated using scanning electron microscopy,electron backscatter diffraction,and atomic force microscopy,*** results showed that crystallographic orientation significantly influenced the corrosion performance of AZ80 Mg *** rates largely increased with decreased(0001)crystallographic plane intensity,whereas the(10−10)and(2−1−10)crystallographic plane intensities *** study showed that the corrosion rates of alloy can be modified to some extent by controlling texture,thereby promoting the applications of high-strength AZ80 Mg alloys in the aerospace and national-defense fields.

关键词： High-strength AZ80 Mg alloy Anisotropy Wrought crystallographic orientation Corrosion performance Surface energy

Variant selection, coarsening behavior of α phase and associated tensile properties in an α+β titanium alloy

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Journal of Materials Science & Technology 2022年第4期99卷 101-113页

作者： Lei Lei Qinyang Zhao Cong Wu Yongqing Zhao Shixing Huang Weiju Jia Weidong Zeng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Material Science and Engineering Chang’an UniversityXi’an 710064China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

Effect of cooling rates,i.e.,air cooling and furnace cooling,after solution in α+β phase-field on variant selection,coarsening behavior of α phase and microstructure evolution were investigated in α+β TC21 *** textures of primary α(α_(p))and lamellar α(α_(L))in β phase transformation microstructure(β_(t))were analysed separately,and the orientation relationship among α_(p),α_(L) and the parent β phase were *** addition,the influence of the microstructure characteristics on the tensile properties was *** results showed that all parent β grains,despite their different orientations,produced 12 ideal α_(L) variants with the same texture components and interweave to form a basketweave β_(t) structure under the air-cooling *** α_(p) without Burgers orientation relationship(BOR)with β phase exhibited obviously texture component without overlapping theαL texture *** volume fraction of α_(p) in the furnace-cooled sample(about 50%)was higher than that of the air-cooled sample(about 12%),while the size of it slightly increased with decreasing the cooling *** each β grain,the thick α_(L) in the same orientation formed anαcolony.A typical 3 variant colonies which were related to each other were ***,the α_(L) spatial orientation distribution showed more ***,the BOR between α_(p) and β and the same orientation of some α_(L) and the surrounding α_(p) grains resulting in the overlapping of α_(p) texture component and α_(L) texture *** last,the relationship between microstructure and tensile properties was analysed.

关键词： TC21 alloy crystallographic orientation Texture Variant selection Tensile properties

Controlled crystal orientation of two-dimensional Ruddlesden-Popper halide perovskite films for solar cells

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 49-58页

作者： Jiuyao Du Mengqi Zhang Jianjun Tian Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Metal halide perovskite solar cells have attracted considerable attention because of their high-power conversion efficiency and costeffective solution-processable fabrication;however,they exhibit poor structural ***-dimensional(2D)Ruddlesden-Popper(RP)perovskites could address the aforementioned issue and present excellent stability because of their hydrophobic organic spacer ***,the crystallographic orientation of 2D crystals should be perpendicular to the bottom substrates for charges to transport fast and be collected in solar ***,controlling the crystallographic orientation of the 2D RP perovskites prepared by the solution process is ***,we reviewed the progress of recent research regarding 2D RP perovskite films with the focus on the crystallographic orientation mechanism and orientation controlling ***,the current issues and prospects of 2D RP perovskites in the photovoltaic field were discussed to elucidate their development and application in the future.

关键词： two-dimensional Ruddlesden-Popper crystallographic orientation perovskite solar cells