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texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr dual-phase alloy during cold rolling based on multiscale crystal plasticity finite element model

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Journal of Materials Science & Technology 2022年第16期111卷 76-87页

作者： Duoduo Wang Qunbo Fan Xingwang Cheng Yu Zhou Ran Shi Yan Qian Le Wang Xinjie Zhu Haichao Gong Kai Chen Jingjiu Yuan Liu Yang National Key Laboratory of Science and Technology on Materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China Microstructure and Properties of Materials(IEK-2) Forschungszentrum JülichJülichGermany Chengdu Advanced Metal Materials Industrial Technology Research Institute Co.Ltd Chengdu 610000China

The complex micromechanical response among grains remains a persistent challenge to understand the deformation mechanism of titanium alloys during cold ***,in this work,a multiscale crystal plasticity finite element method of dual-phase alloy was proposed and secondarily developed based on LS-DYNA ***,the texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr alloy,based on the realistic 3D microstructure,during cold rolling(20%thickness reduction)were systematically *** relative activity of the■slip system in theαphase gradually increased,and then served as the main slip mode at lower Schmid factor({110}slip system showed an upward tendency,indicating the important role of the critical resolved shear stress relationship in the relative activity ***,the abnormally high strain of very fewβgrains was found,which was attributed to their severe rotations compelled by the neighboring pre-deformedα*** calculated pole figures,rotation axes,and compelled rotation behavior exhibited good agreement to the experimental results.

关键词： Titanium alloy Multiscale crystal plasticity finite element model texture evolution Slip mode

texture evolution prediction of 2219 aluminum alloy sheet under hydro-bulging using cross-scale numerical modeling

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Journal of Materials Science & Technology 2023年第18期149卷 190-204页

作者： Yanbo Pei Yonggang Hao Jie Zhao Jiantong Yang Bugang Teng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China

A simultaneous prediction of macroscopic deformation and microstructure evolution is critical for un-derstanding the deformation mechanism of *** this work,the hydro-bulging process of 2219 aluminum alloy sheet was investigated using cross-scale numerical modeling,in which the macroscopic finite element method(FEM)and crystal plasticity finite element method(CPFEM)were *** calculated texture evolution exhibits good agreement with the experimental results,and the stress er-ror between the two scales is generally *** effects of different strain states on texture evolution and slip mode are further *** the strain ratioηincreases,the volume fractions of the initial Rotated Copper texture component andγ-Fiber texture component decrease significantly,which tend to be stabilized at P texture *** initial Rotated Cube texture component is inclined to rotate towards the Cube texture component,while the volume fraction of this orientation is relatively *** lower strain ratio can considerably enhance the activity of more equivalent slip systems,promoting a more uniform strain distribution over *** difficulty of grain deformation changes as the lat-tice *** grain with easy-to-deform orientation can gradually rotate to a stable orientation during plastic deformation,which has a lower Schmid factor.

关键词： Cross-scale modeling Crystal plasticity texture evolution Aluminum alloy Hydro-bulging forming

texture evolution and recrystallization behaviors of Cu-Ag alloys subjected to cryogenic rolling

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 2948-2957页

作者：鲁月马茹王轶农大连理工大学材料科学与工程学院大连116024

The texture evolution and mechanical properties of Cu-Ag alloys subjected to severe plastic deformation at cryogenic temperature（CT） were investigated and the sequent annealing behaviors were also *** with the sheets rolled at room temperature（RT） showing copper texture,the CT-rolled sheets exhibited brass texture which indicated that cross-slip was suppressed at CT,and both the ultimate tensile strength and yield strength of the sheets were *** to the in-situ recrystallization mechanism,recrystallization textures in as-annealed CT-rolled sheets were randomly distributed,while the as-annealed RT-rolled sheets mainly contained cube *** of the rolled and annealed sheets were observed using optical microscopy and electronic back-scatter *** results show that the dynamic recovery was suppressed during CT-rolling and resulted in higher deformation energy ***,the recrystallization of CT-rolled sheets could start at a lower temperature than that of RT-rolled sheet at the same reduction.

关键词： cryogenic rolling copper alloy texture evolution recrystallization behavior

Deformation mechanism of cold ring rolling in view of texture evolution predicted by a newly proposed polycrystal plasticity model

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Transactions of Nonferrous Metals Society of China 2013年第12期23卷 3729-3738页

作者：李宏伟冯璐杨合西北工业大学材料学院凝固技术国家重点实验室西安710072

An explicit polycrystal plasticity model was proposed to investigate the deformation mechanism of cold ring rolling in view of texture evolution. The model was created by deducing a set of linear incremental controlling equations within the framework of crystal plasticity theory. It was directly solved by a linear algorithm within a two-level procedure so that its efficiency and stability were guaranteed. A subroutine VUMAT for ABAQUS/Explicit was developed to combine this model with the 3D FE model of cold ring rolling. Results indicate that the model is reliable in predictions of stress-strain response and texture evolution in the dynamic complicated forming process; the shear strain in RD of the ring is the critical deformation mode according to the sharp Goss component （{110}？100？） of deformed ring; texture and crystallographic structure of the ring blank do not affect texture type of the deformed ring;texture evolves rapidly at the later stage of rolling, which results in a dramatically increasing deformation of the ring.

关键词： cold ring rolling crystal plasticity texture evolution explicit algorithm

Microstructure and texture evolution of AZ31 magnesium alloy during large strain hot rolling

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 14-21页

作者：郭非张丁非杨绪盛蒋璐瑶潘复生重庆大学材料科学与工程学院重庆400045 重庆大学国家镁合金材料工程技术研究中心重庆400044

Commercial AZ31 magnesium alloy sheets were rolled by nearly 70% thickness reduction in one rolling pass at 823 K. The results show that ultrafine grains are distributed in both shear bands and surfaces of the rolled sheets. The grain size of the refined grain in the shear bands is 0.4-1 μm. The outstanding grain refinement is attained by dynamic recrystallization due to flow localization. The texture in middle layer of the sheet is basal texture with little change in intensity throughout the rolling process, while the texture on surface becomes a double-peak texture with basal poles splitting in the transverse direction（TD）. The relative intensity of the double-peak texture is 26.6, which is quite higher than that of the texture in the middle layer. The inhomogeneous strain distribution is responsible for the exceptional grain refinement and texture evolution.

关键词： magnesium alloy microstructure texture evolution shear band large strain rolling

Effect of Cu on microstructure,mechanical properties,and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1511-1523页

作者： Shuai DAI Feng WANG Zhi WANG Zheng LIU Ping-li MAO School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province Shenyang 110870China

As-cast Mg-6Zn-xCu-0.6Zr(x=0,0.5,1.0,wt.%)alloys were fabricated by permanent mold casting;then,the alloys were subjected to homogenization heat treatment and extrusion-shearing(ES)*** microstructure and mechanical properties of the alloys were evaluated by OM,SEM/EDS,XRD,TEM,EBSD and tensile *** results show that the hard MgZnCu phase in Cu-added alloy can strengthen particle-stimulated nucleation(PSN)effect and hinder the migration of dynamic recrystallization(DRX)grain boundary at an elevated temperature during *** ZK60+0.5Cu alloy shows an optimal tensile strength–ductility combination(UTS of 396 MPa,YS of 313 MPa,andδ=20.3%)owing to strong grain boundary strengthening and improvement of Schmid factor for{0001}■basal *** aggregation of microvoids around the MgZnCu phase mainly accounts for the lower tensile elongation of ZK60+1.0Cu alloy compared with ZK60 alloy.

关键词： Mg-Zn-Cu-Zr alloy extrusion-shearing process microstructure characterization mechanical properties texture evolution strengthening mechanism

Phase-field study of the second phase particle effect on texture evolution of polycrystalline material

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Chinese Physics B 2014年第6期23卷 639-643页

作者：卢艳丽张刘超周影影陈铮 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The second phase particle effect on texture evolution of polycrystalline material is studied through phase-field method. A unique field variable is introduced into the phase-field model to represent the second phase particles. Elastic interaction between particles and grains is also considered. Results indicate that in the presence of second phase particles the average particle diameter turns smaller than in the absence of these particles and retards texture formation by pinning effect. The second phase particles change the strain energy profile, which tremendously influences the pinning effect.

关键词： texture evolution second phase particles elastic energy phase-field method

Effect of cooling rate followingβforging on texture evolution and variant selection duringβ→αtransformation in Ti-55511 alloy

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Journal of Materials Science & Technology 2022年第18期113卷 1-13页

作者： Yue Dong Xingang Liu Junjie Zou Yujiao Ke Pengwei Liu Lan Ma Hengjun Luo College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Oxford Instruments(Shanghai)Co. Ltd.No.461Hongcao RoadShanghai 200233China Deyang Wanhang Die Forging Co. Ltd.China National Erzhong Group Co.Deyang 618000China

The control of the post-forging cooling rate has been a key issue in the industrial production process of titanium alloys. We investigated texture evolution and variant selection(VS) during β → α transformation through high-temperature compression experiments followed by quantitative control of varying cooling rates. Results show that post-forging cooling rates affect β grains, α variants, and α/β textures. The αprecipitation inhibits motions of β static recrystallization(β_(SRX)) grain boundaries and thus leads to grain refining from 0.1 ℃/s to 0.05 ℃/s. Further analysis reveals that lamellae grain boundary widmanstattenα(α_(WGB)) keeps growing rapidly within β-grain in an interface instability manner at 0.1–0.05 ℃/s. Most of α-phase with 50°–60°/ is preferentially precipitated at β-medium angle GBs between 30°and 45° and strictly follows BOR with the side of of adjacent β-grain with the same or similar {110} or{111}. Moreover, the texture type transforms gradually from RGoss {110} to Brass {110} from 25 ℃/s to 1 ℃/s. βgrains exhibit(102) [-201] texture, while the corresponding α has textures of//Z and //Y from 1 ℃/s to 0.05 ℃/s. Our findings lay a profound theoretical foundation in microstructure evolution of near-β titanium alloy for industrial production.

关键词： Ti-55511 alloy Cooling rate texture evolution Phase transformation Variant selection(VS)

Microstructure and texture evolution of the β-Mg17A12 phase in a Mg alloy with an ultra-high Al content

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Journal of Materials Science & Technology 2020年第17期52卷 89-99页

作者： Changjian Yan Yunchang Xin Ce Wang Huan Liu Qing Liu International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Research Center for Light-weight and High-performance Materials Nanjing Tech UniversityNanjing 210009China College of Mechanics and Materials Hohai UniversityNanjing 211100China

In the present study,the effects of equal channel angular pressing(ECAP)on the microstructure and mechanical property of the Mg-20Al alloy were systematically *** the first time,the texture of Mg17Al12 phase and its evolution with ECAP conditions were *** results show that increasing the processing temperature and passes generates more uniform distribution and finer size ofβ-Mg17Al12 *** large pieces ofβ-Mg17A12 phases are composed of many fine grains with different crystallographic *** theβ-Mg17A12 phase,a preferred distribution of(001)appears at 523 K and 573 K,and hardly varies with ***,a random texture is observed at 623 ***(0002)poles exhibit a preferred distribution at 473 K,but this preferred distribution varies with temperature.A random distribution of(0002)poles is observed when processed at 623 *** types of crystallographic planar relationship betweenβ-Mg17A12 phase andα-Mg matrix are observed and the relationships of{11-23}//{100}or{110}or{111}and{1-211}//{100}or//{110}or{111}have a relatively higher frequency than *** texture ofα-Mg matrix is much different from that of the ECAPed Mg alloys with a relative low Al content,in which a texture with basal poles inclining approximately 45°away from the extrusion direction often *** mechanical properties of Mg-20Al alloy are closely related to the temperature and passes of ECAP.A higher temperature often decreases the yield strength,but hardly alters the maximum *** is a low plasticity for all the samples and increasing processing temperature slightly enhances the *** corresponding mechanisms were deeply discussed.

关键词： Mg alloy ECAP Mg17Al12 phase texture evolution