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Effect of Texture on the Grain-Size-Dependent Functional Properties of NiTi Shape Memory Alloys and Texture Gradient Design:A Phase Field Study

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Acta Mechanica Solida Sinica 2024年第1期37卷 10-32页

作者： Bo Xu Beihai Huang Chong Wang Qingyuan Wang Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China Department of Mechanical Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Key Laboratory of Deep Underground Science and Engineering Ministry of EducationSichuan UniversityChengdu 610065China

Texture is inevitably introduced during the manufacturing of most NiTi shape memory alloys(SMAs),and the Textured nanocrystalline NiTi has been extensively employed in engineering.However,the effect of Texture,and the joint effect of grain size(GS)and Texture on the functional properties of NiTi SMAs and the corresponding microscopic mechanisms have not been clearly understood yet.In this work,based on the phase field method,the effect of Texture on the GS-dependent functional properties of NiTi SMAs,including super-elasticity(SE),one-way shape memory effect(OWSME),and stress-assisted two-way shape memory effect(SATWSME),is investigated,and the corresponding microscopic mechanisms are revealed.Moreover,the samples with discrete geometrical gradients and/or Texture gradients are designed to achieve graded functional properties.The simulation results indicate that the dependence of functional properties on Texture is due to the effect of crystallographic orientation on martensite transformation and reorientation,which can lead to different inelastic strains.In the designed samples with Texture gradients,the stress–strain responses of sheets with various Textures are different,allowing for the coordination of overall deformation of the sample by combining such sheets,with varying inelastic deformation degrees.Thus,the overall response of the sample differs from that without Texture gradient,leading to the achievement of graded functional properties.The simulation results and new findings in this work contribute to a deeper understanding of the effects of Texture,GS,and their interaction on the functional properties of SMAs,and provide valuable reference for the design and development of SMA-based devices with desired functional properties.

关键词： Phase field NiTi shape memory alloy Texture Grain size Functional property Texture gradient

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Transcriptional regulation of fleshy fruit Texture

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Journal of Integrative Plant Biology 2022年第9期64卷 1649-1672页

作者： Yanna Shi Bai-Jun Li Guanqing Su Mengxue Zhang Donald Grierson Kun-Song Chen College of Agriculture and Biotechnology Zhejiang UniversityZijingang CampusHangzhou310058 China Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology Zhejiang UniversityZijingang CampusHangzhou310058 China State Agriculture Ministry Laboratory of Horticultural Plant Growth Development and Quality ImprovementZhejiang UniversityZijingang CampusHangzhou310058 China Division of Plant and Crop Sciences School of BiosciencesUniversity of NottinghamSutton Bonington CampusLoughboroughLE125RD UK

Fleshy fruit Texture is a critically important quality characteristic of ripe fruit.Softening is an irreversible process which operates in most fleshy fruits during ripening which,together with changes in color and taste,contributes to improvements in mouthfeel and general attractiveness.Softening results mainly from the expression of genes encoding enzymes responsible for cell wall modifications but starch degradation and high levels of flavonoids can also contribute to Texture change.Some fleshy fruit undergo lignification during development and post-harvest,which negatively affects eating quality.Excessive softening can also lead to physical damage and infection,particularly during transport and storage which causes severe supply chain losses.Many transcription factors(TFs)that regulate fruit Texture by controlling the expression of genes involved in cell wall and starch metabolism have been characterized.Some TFs directly regulate cell wall targets,while others act as part of a broader regulatory program governing several aspects of the ripening process.In this review,we focus on advances in our understanding of the transcriptional regulatory mechanisms governing fruit textural change during fruit development,ripening and postharvest.Potential targets for breeding and future research directions for the control of Texture and quality improvement are discussed.

关键词： cell wall lignification softening Texture transcription factor

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Texture property and weakening mechanism of Mg-3Al-1Zn alloy by interactive alternating forward extrusion

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Journal of Magnesium and Alloys 2023年第2期11卷 684-693页

作者： Ye Wang Feng Li Yu Wang Xing Mao Xiao School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040P R China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080P R China Southwest Technique and Engineering Reasearch Institute Chongqing 400039P R China

The interactive alternating forward extrusion(AFE) method can realize the change of Texture type and the weakening of Texture strength.Taking AZ31 magnesium alloy as an example, the Texture evolution of interactive AFE was studied. The results show that all kinds of dynamic recrystallization(DRX) behaviors can weaken the Texture to vary degrees. The weakening effect of twinning-induced recrystallization(TDRX)behavior was particularly significant. During the interactive AFE process, the c-axis of most grains rotated under the external force, and tended to be 90° angle with the ED direction, forming a stable fiber Texture. In addition, with the increase of loading passes, the starting of {0001} basal slip system became more and more difficult. The(10–10) Texture formed by {10–10} prismatic slip system after sixth passes was the main Texture type. With the increase of forming temperature, the starting ability of {10–10} prismatic slip systems increased, and the(10–10) Texture formed by prismatic slip system above 623 K dominated.

关键词： Magnesium alloy Alternating extrusion Texture Recrystallization Grain orientation

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Texture and anisotropy of hot-pressed h-BN matrix composite ceramics with in situ formed YAG

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Journal of Advanced Ceramics 2022年第4期11卷 532-544页

作者： Zhuo ZHANG Xiaoming DUAN Zhuo TIAN Yujin WANG Lan WANG Lei CHEN Baofu QIU Delong CAI Peigang HE Dechang JIA Yu ZHOU Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China

Textured hexagonal boron nitride(h-BN)matrix composite ceramics were prepared by hotpressing using different contents of 3Y_(2)O_(3)–5Al_(2)O_(3)(molar ratio of 3:5)as the sintering additive.During hot-pressing,the liquid Y_(3)Al_(5)O_(12)(YAG)phase showing good wettability to h-BN grains was in situ formed through the reaction between Y_(2)O_(3) and Al_(2)O_(3),and a coherent relationship between h-BN and YAG was observed with[010]_(h-BN)//[111]_(YAG) and(002)_(h-BN)//(321)_(YAG).In the YAG liquid phase environment formed during hot-pressing,plate-like h-BN grains were rotated under the uniaxial sintering pressure and preferentially oriented with their basal surfaces perpendicular to the sintering pressure direction,forming Textured microstructures with the c-axis of h-BN grains oriented parallel to the sintering pressure direction,which give these composite ceramics anisotropy in their mechanical and thermal properties.The highest Texture degree was found in the specimen with 30 wt%YAG,which also possesses the highest anisotropy degree in thermal conductivity.The aggregation of YAG phase was observed in the specimen with 40 wt%YAG,which resulted in the buckling of h-BN plates and significantly reduced the Texture degree.

关键词： hexagonal boron nitride(h-BN) liquid phase sintering Texture anisotropy

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Microstructure,Texture Evolution,and Strain Hardening Behaviour of As-extruded Mg-Zn and Mg-Y Alloys under Compression

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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 430-439页

作者： HAN Xiuzhu XIAO Tao YU Zijian Beijing Institute of Spacecraft System Engineering Beijing100094China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China

Microstructure,Texture evolution and strain hardening behaviour of the Mg-1Y and Mg-1Zn(wt%)alloys were investigated under room temperature compression.Microstructural characterization was performed by optical microscopy,scanning electron microscopy,electron back scattered diffraction and transmission electron microscopy.The experimental results show that Mg-1Zn alloy exhibits conventional three-stage strain hardening curves,while Mg-1Y alloy exhibits novel six-stage strain hardening curves.For Mg-1Y alloy,rare earth Texture leads to weak tensile twinning activity in compression and consequently results in a moderate evolution toTexture.Moreover,inefficient tensile twinning activity and weak slip-twinning interaction give rise to excellent ductility and high hardening capacity but low strain hardening rate.For Mg-1Zn alloy,basal Texture leads to pronounced tensile twinning activity in compression and consequently results in rapid evolution toTexture.The intense tensile twinning activity and strong slip-twinning interaction lead to high strain hardening rate but poor ductility and low hardening capacity.

关键词： magnesium alloy Texture rare earth twinning strain hardening behavior

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Laser additive manufacturing of zinc:formation quality,Texture,and cell behavior

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Bio-Design and Manufacturing 2023年第2期6卷 103-120页

作者： Mingli Yang Liuyimei Yang Shuping Peng Fang Deng Yageng Li Youwen Yang Cijun Shuai Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Central South UniversityChangsha 410078China NHC Key Laboratory of Carcinogenesis School of Basic Medical ScienceCentral South UniversityChangsha 410013China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes Tongling UniversityTongling 244061China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(Zn)to be used to produce customized orthopedic implants.In this research,we investigate the impact of laser power and scanning speed on the development of surface quality,relative densification,and Texture during LPBF of Zn implants.Increasing laser power was able to decrease melt viscosity and surface tension,which improved the metallurgical bonding between adjacent tracks.Uneven and twisted tracks also became continuous and straight.Scanning speed could controlmolten-pool temperature to restrain grain natural orientation,achieving various crystal orientations and a weakened Texture.Importantly,it further avoided the thermal expansion and contraction caused by excessive energy storage and accumulation in the matrix,thus reducing the generation of high-dislocation density.As a result,by selecting a reasonable laser power and scanning speed,the LPBF parts exhibited a flat surface morphology and a high density over 99.5%.Their average hardness,mechanical strength,and elongation reached 50.2 HV,127.8 MPa,and 7.6%,respectively.Additionally,the parts displayed a moderate degradation rate and excellent osteogenic properties.All these results provide a basis for selecting process parameters to optimize the comprehensive properties of LPBF-processed Zn parts for biodegradable applications.

关键词： Zn implants Additive manufacturing Laser powder bed fusion Formation quality Texture Osteogenic properties

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Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg-Zn-Gd Alloy by Annealing

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 251-265页

作者： Xihai Li Hong Yan Rongshi Chen School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China

The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal Texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical anisotropy.In this study,multi-cross rolling followed by annealing was used to tailor the Texture and mechanical anisotropy for Mg-Zn-Gd alloy.With increasing annealing temperature,the rolled basal Texture with two peaks gradually transformed into the circle Texture with multi-peaks.In order to figure out different Texture components evolution during annealing,the basal Texture,R-Texture and T-Texture component were defined and studied.The results showed that the change of R-Texture and T-Texture component was asynchronous with increasing annealing temperature from 250 to 400℃.The tilting angle of R-Texture component increased slightly,while the tilting angle of T-Texture component increased obviously,and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth.The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction(RD),resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature.Annealing at 300℃was the best annealing temperature due to low yield strength anisotropy,moderate strength and good elongation among these annealing temperatures.The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly,while that along TD increased obviously with increasing annealing temperature from 250 to 400℃,which should be caused by the asynchronous change of R-Texture component and T-Texture component,consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.

关键词： Mg-Zn-Gd alloy Annealing Texture Yield strength Electron back-scattering diffraction(EBSD)

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Microstructure and Texture evolution of nonoriented silicon steel during the punching process

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2064-2071页

作者： Xiang Fang Wei Wang François Brisset Anne-Laure Helbert Thierry Baudin School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China Hubei Research Center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China Institut de Chimie Moléculaire et des Matériaux d’Orsay UniversitéParis-SaclayCNRS91405 OrsayFrance

The iron core of a motor is mainly manufactured from rolled nonoriented silicon steel using a punching process that leads to deformation and Texture evolution at the cutting edge.According to this process,circular samples of nonoriented silicon steel were prepared by punching using blunt punch tools.In this work,two positions along the rolling and transverse directions at the cutting edge were analyzed.The main mechanisms of deformation for both positions are dislocation slip and formation of shear bands.These two mechanisms lead to similar Texture evolutions for both positions.The dislocation slip leads to the formation of the{221}component in the unbending area(200μm away from the cutting edge)and intermediate continuum-bent area.Additionally,the evolution of the Texture from the{111}γfiber to the{110}fiber was observed at the extremity of the cutting edge with the formation of shear bands.

关键词： microstructure Texture nonoriented silicon steel punching

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Nucleation of recrystallization in magnesium alloy grains of varied orientation and the impacts on Texture evolution

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Journal of Magnesium and Alloys 2022年第11期10卷 3041-3053页

作者： Victoria M.Miller Jian-Feng Nie Tresa M.Pollock Department of Materials Science and Engineering University of FloridaGainesvilleFL 32611USA Department of Materials Science and Engineering Monash UniversityVictoria 3800Australia Materials Department University of California Santa BarbaraSanta BarbaraCA 93106-5050USA

Selection of appropriate thermomechanical processing parameters is crucial for control of the crystallographic Texture and grain size distribution in wrought magnesium alloys, which in turn dictate their mechanical properties. In this work, the recrystallization behavior of binary Mg-Zn alloys are examined after warm rolling as a function of alloy content and heat treatment temperature. The Avrami exponent increased with increasing heat treatment temperature up to the Mg Zn solvus, while the strength of the recrystallization Texture decreased.Neither the Avrami exponent nor the qualitative trends in Texture evolution were sensitive to the Zn alloying content in the examined range.EBSD and transmission electron microscopy observations revealed that the changes in Texture and recrystallization kinetics could be attributed to differences in the nucleation behavior of basal and off-basal orientations.

关键词： Magnesium alloys Recrystallization Dislocation substructure Texture

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Plastic instability and Texture modification in extruded Mg-Mn-Nd alloy

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Journal of Magnesium and Alloys 2022年第1期10卷 160-174页

作者： Sang Kyu Woo Risheng Pei Talal Al-Samman Dietmar Letzig Sangbong Yi Magic-Magnesium Innovation Center Institute for Materials and Process DesignHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany Institut für Metallkunde und Materialphysik RWTH Aachen UniversityAachen 52056Germany

Even though Mg alloys containing Mn and rare earth elements lead to higher ductility and lower yield asymmetry due to the weak Texture after extrusion, plastic instability, commonly known as the Portevin–Le Chatelier(PLC) effect, causes unexpected fragility in the service environment. In the present study, the PLC phenomenon and Texture development during the deformation of Mg-Mn and Mg-Mn-Nd extruded alloys were investigated under various temperatures and strain rates. The addition of Nd causes not only Texture weakening but also severe PLC phenomenon. The PLC phenomenon was significantly affected by the temperatures and the strain rates, which causes a difference in mechanical properties and development of Texture. In the conditions of high temperature and low strain rate, the strength increased while the elongation decreased significantly, and obvious PLC phenomenon with severe serration and negative strain rate sensitivity. The initial Texture was maintained even after deformation only under severe PLC conditions, and this is due to the restriction of basal slip and suppression of lattice rotation in PLC conditions. The series of results indicate that the PLC phenomenon causes a reduction of formability even at high temperature.

关键词： Magnesium Plastic instability Portevin–Le Chatelier effect Manganese Neodymium Texture

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