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Effect of initial orientation on microstructure and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding

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Progress in Natural science:materials International 2023年第2期33卷 178-184页

作者： Xia Cao Tingzhuang Han Ji Xu Guangsheng Huang Hua Zhang Jianhui Bai Fusheng Pan Department of Mechanics and Surface Engineering Changzhou Institute of Technology Department of Aviation Manufacturing Engineering Changzhou Institute of Technology State Key Laboratory of Solidification Processing School of Materials Science & Engineering Northwestern Polytechnical University State Key Laboratory of Mechanical Transmission College of Materials Science and Engineering Chongqing University Institute for Advanced Studies in Precision Materials Yantai University

In this study, effects of initial orientation on microstructure evolution and mechanical properties of AZ31 Mg alloy sheets via accumulated extrusion bonding(AEB) was systematically studied. The samples with RD and TD parallel to extrusion direction(ED) were labeled as RED and TED, respectively. RD and TD pieces alternately stacked was named as RTED. The results revealed that under three-dimensional compressive stress, {10-12} tensile twinning dominated the first stage deformation in container. As the plunger continuous press down, dynamic recrystallization(DRX) occurred, and the newly fine DRXed grains along original and twin grain boundaries gradually consumed the matrix and twin grains. The microstructure was completely transformed into recrystallized grain structure at sizing band with an average grain size of ～0.9 μm in TED sample, smaller than that of RED *** the alloys extruded out of the die, DRXed grains significantly grew to ～4.5 μm and 3.5 μm for RED and TED samples, respectively. A laminated microstructure was obtained with average grain sizes of～4.4 μm in RD layers and 3.5 μm in TD layers for RTED sample. The AEB processed samples exhibited an ED-tilt double-peak basal texture with similar texture intensity. The tensile tests results indicated that attributed to the combined effect of grain refinement and texture evolution, the yield strength and fracture elongation of RED and TED samples was significantly improved. The heterogeneous microstructure in RTED sample induced an extra work hardening(HDI-work hardening) in tensile deformation and resulted in a further improved elongation of 32.0%.

关键词： Magnesium alloy Accumulated extrusion bonding Initial orientation Microstructure Texture mechanical properties

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Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling

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Underground Space 2023年第4期11卷 96-115页

作者： Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway

In the present study,a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting ***,based on the calibrated numerical model,two-hole plane models are developed and used to perform a series of sim-ulations of smoothwall blasting in deep tunnelling subjected to in-situ *** evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically *** findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter *** numerical and analytical results show that the variations of rock cracking and excavation dam-aged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole,which control the crack propagation and initiation *** last,the implications of findings for practical smoothwall blasting in deep tunnelling are discussed.

关键词： Smoothwall blasting In-situ stress Crack propagation Excavation damaged zone Stress distribution Numerical simulation

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Solid-state bonding process induced highly synergistic mechanical properties of 6061 Al alloy joint by shear deformation

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Journal of materials science & Technology 2023年第33期164卷 168-178页

作者： Peng Peng Jian Su Qingsong He Ruinan Chen Sensen Chai Daliang Yu Qingwei Dai Jian Lu School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing401331China Department of Mechanical Engineering City University of Hong KongHong KongChina

Obtaining a highly synergistic mechanical property between joint and base metal(BM)in aluminum(Al)alloy is a chronic *** this work,shear bonding technology is applied to a commercial 6061 Al *** results show that a flat and uniform joint interface is *** joint presents a highly synergistic mechanical property compared with BM,whether after shear bonding or heat *** joint coefficient reaches 95.6%after shear bonding and exceeds 100%after heat treatment,which is better than the traditional connection method of aluminum *** high joint coefficient mainly originates from the well-linked joint and gradient grain *** gradient grain structure is beneficial to activate more slip systems to coordinate plastic *** the fine-grained structure is sacrificed after heat treatment,higher strength and joint coefficient are obtained due to the higher work *** newly developed method has a large potential for application to the infinite rolling of Al alloy sheets and can also be used for Al alloy connection in automobile,aerospace,rail transportation,and other *** findings in this work can provide essential theoretical support and application reference for the shear connection of Al alloy.

关键词： 6061 Al alloy Shear bonding Microstructure mechanical property

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Laser powder b e d fusion of copper matrix iron particle reinforced nanocomposite with high strength and high conductivity

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Journal of materials science & Technology 2023年第3期134卷 50-59页

作者： Yingang Liu Jingqi Zhang Qiang Sun Meng Li Ming Yan b Xing Cheng Miaoquan Li Ming-Xing Zhang School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia Department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Liquid-liquid phase separation,and the resulted solute segregation,during conventional solidification have been a long-term challenge to produce copper(Cu)-iron(Fe)immiscible composites with high strength and high *** present work reports an effective solution to this issue through laser powder bed fusion(L-PBF)in-situ alloying of Cu-8 wt.%*** observation showed that the fast cooling within micron-scale melt pools fully eliminated the Fe segregation and therefore the L-PBF fabricated nanocomposite achieved the homogeneous microstructure,which featured equiaxed fine grains around 1μm in *** of the nanocomposite at 600℃for 1 h enabled precipitation of two types of *** is coarser Fe nanoprecipitates with body-centered cubic(BCC)structure and diam-eter of 100-300 nm,mainly distributing along grain *** other is smaller Fe nanoprecipitates with face-centered cubic(FCC)structure and diameter of 10-35 nm,being observed within the grains and having coherent interfaces with the Cu *** a result,the aged Cu-Fe nanocomposite achieved tensile strength of 462.9±6.6 MPa with 30.4%±1.7%elongation to failure and 74.5%IACS(International Annealed Copper Standard)electrical *** formation mechanisms of the nanoprecipitates and the strengthening mechanisms of the nanocomposite are discussed.

关键词： Immiscible alloy Copper Laser powder bed fusion Ageing Nanocomposite

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Advanced 3D-printed antibacterial nano 58S bioglass/AgNPs/CeO2-based scaffolds for bone tissue engineering

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Ceramics International 2025年第15期51卷 20939-20953页

作者： Singh, Indrajeet Kong, Ing Viswakarma, Ashok Balani, Kantesh Advanced Polymer and Composite Materials Laboratory Department of Engineering School of Computing Engineering and Mathematical Sciences La Trobe University BendigoVIC3550 Australia Department of Materials Science and Engineering Indian Institute of Technology Kanpur208016 India Department of Mechanical Engineering Indian Institute of Technology Kanpur208016 India

58S bioglass (BG) has been considered an effective bioceramic in bone tissue engineering due to its good osteoinductive and osteoconductive properties;however, its poor antibacterial and printing properties remain a challenge in the development of ideal patient-specific, fully interconnected, bone-like scaffolds. To address this issue, this study presents novel 3D-printed BG/AgNPs/CeO2 (BGAC3D) composite scaffolds. These scaffolds exhibit a fully interconnected pore network (≈99 %) with a porosity of ≈64 % and optimally designed pore and strut sizes of 404 ± 15 μm and 394 ± 30 μm, respectively, making them suitable for bone healing applications. Adding AgNPs and ceria nanoparticles significantly increased the shear-thinning properties of Pluronic F-127/BG/AgNPs/CeO2-based ink, as compared to Pluronic F-127/BG-based ink. As a result, BGAC3D scaffold showed improved dimensional accuracy during printing relative to pristine BG. Nanoindentation studies revealed substantial increase in the mechanical properties of BGAC3D scaffolds, with elastic modulus, hardness, and compressive strength showing enhancement of 76 % (57.9 ± 8 GPa), 24 % (3.1 ± 1 GPa), and 275 % (1.5 ± 0.4 MPa), respectively. The antibacterial properties of BGAC3D scaffolds were investigated using disc diffusion and bacterial adhesion assays, which demonstrated an exceptional bactericidal efficacy of 99.3 % against Escherichia coli (E. coli) and 99.4 % against Staphylococcus aureus (S. aureus) compared to pristine BG. The cytocompatibility of the scaffolds was assessed using resazurin assays with mouse BMSCs and MTT assays with mouse fibroblasts, revealing enhanced cell viability for the BGAC3D composition compared to BG. Additionally, both BG and BGAC3D composites showed similar apatite mineralization on their surfaces, as observed under a scanning electron microscope. These findings indicate that BGAC3D scaffolds possess the necessary mechanical, antibacterial, and cytocompatibility properties, making th

关键词： Escherichia coli

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Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour

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Nano materials science 2024年第5期6卷 587-595页

作者： Lizi Cheng Xiaofeng Zhang Jiacheng Xu Temitope Olumide Olugbade Gan Li Dongdong Dong Fucong Lyu Haojie Kong Mengke Huo Jian Lu CityU-Shenzhen Futian Research Institute ShenzhenChina Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Engineering University of CambridgeCambridgeUK National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of Science510650GuangzhouChina Mechanical and Electronic Engineering Department School of Science and EngineeringUniversity of DundeeDundeeUK Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhenChina

Surface modifications can introduce natural gradients or structural hierarchy into human-made microlattices,making them simultaneously strong and ***,we describe our investigations of the mechanical properties and the underlying mechanisms of additively manufactured nickel–chromium superalloy(IN625)microlattices after surface mechanical attrition treatment(SMAT).Our results demonstrated that SMAT increased the yielding strength of these microlattices by more than 64.71%and also triggered a transition in their mechanical *** primary failure modes were distinguished:weak global deformation,and layer-by-layer collapse,with the latter enhanced by *** significantly improved mechanical performance was attributable to the ultrafine and hard graded-nanograin layer induced by SMAT,which effectively leveraged the material and structural *** results were further validated by finite element *** work provides insight into collapse behaviour and should facilitate the design of ultralight yet buckling-resistant cellular materials.

关键词： Architected materials Selective laser melting Surface mechanical attrition treatment Structural analysis Ductile alloy

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Mechanism modulating the redox chemistry of hexaazatriphenylene-based small molecules by push–pull electron effect for zinc-ion batteries

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Rare Metals 2025年 1-10页

作者： Wang, Zhi-Qiang Liu, Jing-Wei Chen, Jing-Jing Huang, Yong-Cong Hussain, Iftikhar Luo, Wen Yuan, Hui-Min Hu, Jing Wang, Zhen-Yu Yang, Ming-Yang Li, Ying-Zhi Liu, Gui-Yu Gu, Shuai Zhang, Kai-Li Lu, Zhou-Guang Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China College of Chemistry and Chemical Engineering Central South University Changsha410083 China Department of Mechanical Engineering City University of Hong Kong 999077 Hong Kong

Organic compounds are promising electrode materials for aqueous zinc-ion batteries (AZIBs) but largely suffer from poor rate and cycling performance. This work reports that the push–pull electron effect of organic compounds could be used to tune the electrochemical performance of AZIBs. Hexaazatriphenylene-based (HATN) small molecules with different withdrawing or donating groups were synthesized and used as electrodes for AZIBs. Compared to the hydrogen atoms and electron-donating methyl groups, the electron-withdrawing fluorine atoms endow HATN-based small molecule (HATN-6F) with a much-improved redox platform, rate performance and cycling stability. The fluorinated electrode HATN-6F potently amplifies and stabilizes the kinetics of cation co-(de)insertion reactions, concurrently enhancing the conductivity and electron affinity, resulting in improved rate performance and enhanced cycling stability. The combination of theoretical calculations and experimental characterization confirms that the fluorine-rich peripheral environment effectively modifies the distribution of conjugated electrons in HATN, enhancing its affinity for zinc ions and improving its capacity for cations zinc storage. This work demonstrates a new avenue for the design and synthesis of organic electrode with excellent electrochemical performance for ZIBs. © Youke Publishing Co.,Ltd 2025.

关键词： Redox reactions

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Influence of Biomimetic Apatite Coating on the Biobehavior of TiO_(2)Scaffolds

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Journal of Bionic engineering 2024年第4期21卷 1975-1986页

作者： Shima Mahtabian Seyed Mehdi Mirhadi Nahid Hassanzadeh Nemati Melika Sharifi Fariborz Tavangarian Department of Biomedical Engineering University of DelawareNewarkDE19716USA Department of Ceramic Engineering Islamic Azad University(Shahreza Branch)ShahrezaIsfahan86145-311Iran Department of Biomedical Engineering Islamic Azad University(Science and Research Branch)TehranIran Mechanical Engineering Program School of ScienceEngineering and TechnologyPennsylvania State UniversityHarrisburgMiddletownPA17057USA Department of Materials Science&Engineering Islamic Azad University(Najaf Abad Branch)Najaf AbadIsfahan***Iran Biomedical Engineering Department Pennsylvania State UniversityState CollegeUniversity ParkPennsylvania16802USA

Immersion of scaffolds in Simulated Body Fluid(10SBF)is a standardized method for evaluating their bioactivity,simulating in vivo conditions where apatite deposits can be formed on the surface of scaffold,facilitating bone integration and ensuring their suitability for bone implant purposes,ultimately contributing to long-term implant *** effect of apatite deposition on bioactivity and cell behavior of TiO_(2)scaffolds was *** were soaked in 10SBF for different durations to form HAP layer on their *** results proved the development of a hydroxyapatite film resembling the mineral composition of bone Extracellular Matrix(ECM)on the TiO_(2)*** XRD test findings showed the presence of hydroxyapatite layer similar to bone at the depth of 10 nm.A decrease in the specific surface area(18.913 m^(2)g^(−1)),the total pore volume(0.045172 cm^(3)g^(−1)(at p/p0=0.990)),and the mean pore diameter(9.5537 nm),were observed by BET analysis which confirmed the formation of the apatite *** was found that titania scaffolds with HAP coating promoted human osteosarcoma bone cell(MG63)cell attachment and *** seems that immersing the scaffolds in 10SBF to form HAP coating before utilizing them for bone tissue engineering applications might be a good strategy to promote bioactivity,cell attachment,and implant fixation.

关键词： Titania Hierarchical meso/macro porous 10SBF Biomimetic apatite Coating

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Metallurgy and Solidification Microstructure Control of Fusion-Based Additive Manufacturing Fabricated Metallic Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 29-53页

作者： Qiang Li Xing-Ran Li Bai-Xin Dong Xiao-Long Zhang Shi-Li Shu Feng Qiu Lai-Chang Zhang Zhi-Hui Zhang Key Laboratory of Bionic Engineering(Ministry of Education) and College of Bionic Science and EngineeringJilin UniversityChangchun130022China Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyang110167China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

The metal-based additive manufacturing(AM),also referred to as metal 3D printing,has drawn particular interest because it enables direct creation,aided by computationally-directed path design,of intricate components with site-specific compositions and geometrical requirements as well as low buy-to-fly *** the last two decades,the objective of this revolutionary technology has been shifting from only“rapid prototyping”to advanced manufacturing of special high-end products or devices,which,in many aspects,outperform conventional manufacturing *** fusion-based AM,significant progress has been achieved in understanding the processing window of macroscopic scales,non-equilibrium metallurgy of mesoscale scales,and grain evolution of microscopic *** the versatile capacity of AM facilitates new avenues for discovering advanced materials and structures,their potential has still not been fully *** the unique non-equilibrium solidification during the AM process,coarse columnar grains with strong textures are usually developed along the build direction,which downgrades the mechanical *** push the limits of this digital manufacturing,this review attempts to provide in-depth and comprehensive overviews of the recent progress in understanding the evolution and control of the as-built microstructure that has been made recently and the challenges encountered during the AM process.

关键词： Additive manufacturing Temperature field Microstructure control Nanoparticles Functionally graded materials

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Temperature dependence of pressure sensitive flow in bulk metallic glass composites

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Journal of materials science & Technology 2024年第14期181卷 165-175页

作者： Priyanka Saini Yakai Zhao Biao Li Long Zhang U.Ramamurty R.L.Narayan Department of Materials Science and Engineering Indian Institute of TechnologyDelhi 110016India School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Republic of Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research138634Republic of Singapore Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The constraint factor,C,defined as hardness,H,to the yield strength,σ_(y),ratio,is an indirect measure of the pressure sensitivity in *** investigations determined that while C is less than 3 for crystalline materials,and remains invariant with change in temperature,it is greater than 3 for bulk metallic glasses(BMGs)and increases with increasing temperature,below their glass transition temper-ature,T_(g).In this study,the variations in C for two BMG composites(BMGCs),which have an amorphous matrix and in situ precipitated crystallineβ-Ti dendrites,which in one case transforms under stress toα”-Ti and deforms by slip in the other,as a function of temperature are examined and compared with that of a *** this purpose,instrumented indentation tests,with a Berkovich tip,and uniaxial com-pression tests were performed to measure the H andσ_(y),respectively,on all alloys and their constituents at temperatures in the range of 0.48 T_(g) and 0.75 T_(g).σ_(y) and H of the BMGC with transforming dendrites(BMGC-T)increase and remain invariant with increasing temperature,***,in BMG and the BMGC with non-transforming dendrites(BMGC–NT),the same properties decrease with increas-ing ***-T has the highest C of∼4.93 whereas that of BMGC–NT and BMG are∼3.72 and∼3.28,respectively,at 0.48 T_(g).With increasing temperature,C of the BMG and BMGC–NT increases with temperature,but that of the BMGC-T *** values of C and their variations as a function of temperature were explained by studying the variation of pressure sensitivity of the amorphous phase and concluding that the plastic flow in BMGCs under constrained conditions,such as indentation,is con-trolled by the flow resistance of the amorphous matrix whereas that in uniaxial compression,which is only partially constrained,is controlled by plasticity in both the dendrites and matrix.

关键词： Bulk metallic glass composites Hardness Pressure sensitivity Martensitic transformation

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