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Simultaneous enhancement of mechanical and shape memory properties by heat-treatment homogenization of Ti_(2)Ni precipitates in TiNi shape memory alloy fabricated by selective laser melting

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Journal of Materials Science & Technology 2022年第6期101卷 205-216页

作者： h.Z.Lu L.h.Liu c.Yang X.Luo c.h.song Z.Wang J.Wang Y.D.Su Y.F.Ding L.c.Zhang Y.Y.Li National Engineering Research center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Musculoskeletal Oncology Department Sun Yat-Sen University Cancer CenterGuangzhouGuangdong ProvinceChina Shenyang Aircraft Design and Research Institute Shenyang 110035China Guangdong huayi Plumbing Fittings Industry co. Ltd.Kaiping 529321China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia

The excellent shape memory and mechanical properties of Ti Ni shape memory alloys(SMAs) fabricated using selective laser melting(SLM) are highly desirable for a wide range of critical applications. In this study, we examined the simultaneous enhancement of mechanical and shape memory properties using heat-treatment homogenization of Ti_(2)Ni precipitates in a Ti_(50.6)Ni_(49.4)SMA fabricated using SLM. Specifically, because of the complete solution treatment, nanoscale spherical Ti_(2)Ni precipitates were homogeneously dispersed throughout the grain interior. Interestingly, the resultant SMA exhibited an ultrahigh tensile strength of 880 ± 13 MPa, a large elongation of 22.4 ± 0.4%, and an excellent shape memory effect, with a recovery rate of > 98% and ultrahigh recoverable strain of 5.32% after ten loading–unloading cycles. These simultaneously enhanced properties are considerably superior than those of most previously reported Ti Ni SMAs fabricated using additive manufacturing. Fundamentally, the enhancement in tensile strength is ascribed to precipitation strengthening and work hardening, and the large plasticity is mainly attributed to the homogeneous nanoscale globular Ti_(2)Ni precipitates, which effectively impeded the rapid propagation of microcracks. Furthermore, the enhanced shape memory properties are derived from the suppression of dislocation movement and formation of retained stabilized martensite by the presence of high-density dislocations, nanoscale Ti_(2)Ni precipitates, and abundant interfaces. The obtained results provide insight into the enhancement of the two types of properties in Ti Ni SMAs and will accelerate the wider application of SMAs.

关键词： Shape memory alloy Selective laser melting heat treatment Mechanical properties Shape memory properties

MOF-derived ZrO_(2)/c-polyvinylidene fluoride composite towards negative permittivity regulation mechanism

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Journal of Materials Science & Technology 2024年第12期179卷 50-56页

作者： X.T.song G.h.Fan Y.Liu R.h.Fan Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Jinan 250061China Institute of Advanced Electrical Materials Qingdao University of Science&TechnologyQingdao 266042China college of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China

composites featuring negative permittivity have garnered significant attention for their potential in novel capacitance designs,coil-less electrical inductors,and electromagnetic shielding *** this study,we prepared polyvinylidene fluoride(PVDF)matrix composites filled with ZrO_(2)/c nanoparticles de-rived from metal-organic frameworks(MOFs)via a hot-pressing *** an increase in the ZrO_(2)/c content to 30 wt.%,electrical percolation was observed,accompanied by a transition mechanism from hopping conduction to metal-like *** enabled the realization of ZrO_(2)/c/PVDF composites with tailorable negative permittivity properties,attributed to the plasmonic oscillation of free electrons in the composites beyond the percolation threshold(30 wt.%).Furthermore,the permittivity transition along to a shift in the electrical behavior of the percolative composites from capacitive to *** explored the regulatory mechanism behind the negative permittivity in this random composite system,and our findings highlight the potential of these tunable negative permittivity media as promising candi-dates for diverse electromagnetic applications.

关键词： Negative permittivity Electrical properties Plasma oscillation Polymeric composites

Two-dimensional correlation spectroscopic analysis on the interaction between humic acids and aluminum coagulant

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Journal of Environmental Sciences 2018年第2期30卷 181-189页

作者： Pengkang Jin Jina song Xiaochang c.Wang Xin Jin School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology college of Energy and Environmental Engineering Hebei University of Engineering

In this study, two-dimensional correlation spectroscopy integrated with synchronous fluorescence and infrared absorption spectroscopy was employed to investigate the interaction between humic acids and aluminum coagulant at slightly acidic and neutral p h. higher fluorescence quenching was produced for fulvic-like and humic-like fractions at p h 5. At p h 5, the humic-like fractions originating from the carboxylic acid, carboxyl and polysaccharide compounds were bound to aluminum first, followed by the fulvic-like fractions originating from the carboxyl and polysaccharide compounds. This finding also demonstrated that the activated functional groups of hA were involved in forming the Al-hA complex, which was accompanied by the removal of other groups by ***, at p h 7, almost no fluorescence quenching occurred, and surface complexation was observed to occur, in which the activated functional groups were absorbed on the amorphous Al（Oh）3. Two-dimensional FT-IR correlation spectroscopy indicated the sequence of hA structural change during coagulation with aluminum, with IR bands affected in the order of cOOh〉 cOO-〉Nh deformation of amide Ⅱ〉 aliphatic hydroxyl c／Oh at p h 5, and cOO-〉aliphatic hydroxyl c／Oh at p h 7. This study provides a promising pathway for analysis and insight into the priority of functional groups in the interaction between organic matters and metal coagulants.

关键词： Two-dimensional correlation spectroscopy Al-hA complex Surface complexation Interaction sequence

AAV-mediated expression of p65shRNA and bone morphogenetic protein 4 synergistically enhances chondrocyte regeneration

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中国组织工程研究 2025年第17期29卷 3537-3547页

作者： Yu Yangyi song Zhuoyue Lian Qiang Ding Kang Li Guangheng Shenzhen Key Laboratory of Musculoskeletal Tissue Reconstruction and Function Restoration Division of Adult Joint Reconstruction and Sports MedicineDepartment of Orthopedic SurgeryShenzhen People’s Hospital(The Second Clinical Medical College Jinan UniversityThe First Affiliated HospitalSouthern University of Science and Technology)Shenzhen 518020Guangdong ProvinceChina Department of Orthopedics Zhengzhou Orthopedics HospitalZhengzhou 450000Henan ProvinceChina Department of Orthopedics Shenzhen Pingle Orthopedics HospitalShenzhen 518000Guangdong ProvinceChina

BAcKGROUND:Adeno-associated virus(AAV)gene therapy has been proven to be reliable and safe for the treatment of osteoarthritis in recent ***,given the complexity of osteoarthritis pathogenesis,single gene manipulation for the treatment of osteoarthritis may not produce satisfactory *** studies have shown that nuclear factorκB could promote the inflammatory pathway in osteoarthritic chondrocytes,and bone morphogenetic protein 4(BMP4)could promote cartilage ***:To test whether combined application of AAV-p65shRNA and AAV-BMP4 will yield the synergistic effect on chondrocytes regeneration and osteoarthritis ***:Viral particles containing AAV-p65-shRNA and AAV-BMP4 were *** efficacy in inhibiting inflammation in chondrocytes and promoting chondrogenesis was assessed in vitro and in vivo by transfecting AAV-p65-shRNA or AAV-BMP4 into *** experiments were divided into five groups:PBS group;osteoarthritis group;AAV-BMP4 group;AAV-p65shRNA group;and BMP4-p65shRNA 1:1 *** were collected at 4,12,and 24 weeks *** staining,including safranin O and Alcian blue,was applied after collecting articular ***,the optimal ratio between the two types of transfected viral particles was further investigated to improve the chondrogenic potential of mixed cells in *** AND cONcLUSION:The combined application of AAV-p65shRNA and AAV-BMP4 together showed a synergistic effect on cartilage regeneration and osteoarthritis *** cells transfected with AAV-p65shRNA and AAV-BMP4 at a 1:1 ratio produced the most extracellular matrix synthesis(Phat the combination of the two viruses had the highest regenerative potential for osteoarthritic cartilage(Phe present study,we also discovered that the combined therapy had the maximum effect when the two viruses were administered in equal *** either p65shRNA or BMP4

关键词： osteoarthritis adeno-associated virus bone morphogenetic protein 4 p65-short hairpin RNA gene therapy short hairpin RNA transforming growth factor-β1 extracellular matrix articular cartilage chondrocytes.

POLAROGRAPhIc cATALYTIc WAVE OF GLYcYRRhIZIc AcID

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chinese chemical Letters 1995年第4期6卷 321-324页

作者： song, JF Guo, W Du, h NW Univ Xian Inst Electroanalyt Chem Xian 710069 Peoples R China

A polarographic catalytic wave of glycyrrhizic acid( I) in the presence of h2O2 is described. The electrochemical process is considered to be that I yielded a free radical intermediate through a one-electron reduction of its c = c double bond, and the active intermediate was oxidized to regenerate I. The catalytic wave should be new-type one due to reduction and regeneration of organic depolarizer.

关键词： POLAROGRAPhIc cATALYTIc WAVE OF GLYcYRRhIZIc AcID

Ultrasonic-based surface patterning and interfacial reaction of ZrO_(2)ceramics

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Journal of Materials Science & Technology 2023年第24期155卷 202-210页

作者： h.J. Dong Z.L. Li X.G.song J.c. Feng S.J. Wei J.h. Fu Y. Shi State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China Shandong Provincial Key Lab of Special Welding Technology Harbin Institute of Technology at Weihai Weihai 264209 China

We demonstrate a process to achieve selective surface metallization of ZrO_(2)ceramics using ultrasound technology in atmospheric environments at 350℃,which bestows good weldability of ZrO_(2)to achieve rapid and reliable connections with other metals as well as ceramic *** challenge is that brazing or diffusion welding processes to accomplish metallurgical connections for ZrO_(2) typically require holding at elevated temperatures for minutes to hours,while the selective ultrasonic metallization process requires only a few seconds of processing without the application of covering films or solder *** this study,the selected Sn-2Ti alloy could effectively wet and spread on ZrO_(2)substrate under ultrasonication,and continuous interphase layers were rapidly formed in situ between ZrO_(2)and *** bonding strength for the ZrO_(2)/Sn-2Ti interface was well established with the highest shear strength of 37.1 MPa,and the fracture location occurred at the filler *** interfacial reaction layer thickened remarkably with the prolongation of sonication,accompanied by the partial crystallization of amorphous TiO and the formation of irregularly striped Ti_(11.31)Sn_(3)O_(10)nanocrystals.

关键词： Selective ultrasonic metallization Zirconia surface patterning Low temperature connection Sono-oxidation Interfacial reaction

Role of grain boundary character on Bi segregation-induced embrittlement in ultrahigh-purity copper

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Journal of Materials Science & Technology 2023年第28期159卷 52-61页

作者： Y.X.hua K.X.song h.T.Liu J.W.Wang c.M.Zhang Y.J.Zhou B.Pang J.T.song J.L.he h.L.Zhao School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China henan Academy of Sciences Zhengzhou 450000China henan Key Laboratory of Advanced conductor Materials Zhengzhou 450046China Provincial and Ministerial co-construction of collaborative Innovation center of Nonferrous New Materials and Advanced Processing Technology Luoyang 471023China center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China college of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Bismuth(Bi),as an impurity element in copper and copper-based alloys,usually has a strong tendency of grain boundary(GB)segregation,which depends on the GB ***,the influence of such a segregation on the properties of ultrahigh-purity copper has been rarely reported and the exact structural arrangements of Bi atoms at different GBs remain largely *** this study,we investigated the influ-ence of trace amounts of Bi(50-300 wt ppm)on the ductility of an ultrahigh-purity copper(99.99999%)in the range of room temperature to 900°*** tensile results show that the addition of Bi seriously damages the ductility of the ultrahigh-purity copper at temperatures of 450-900°c,which is due to the GB segregation of *** this basis,such a segregation behavior at different types of GBs,including high and low angle GBs(hAGBs/LAGBs),and twin boundaries(TBs),via the scanning electron microscope-electron backscattered diffraction(SEM-EBSD)and aberration-corrected scanning transmission electron microscope(Ac-STEM)investigations,combined with the first-principles calculations were systematically *** atomistic characterizations demonstrate an anisotropic Bi segregation,where severe enrich-ment of Bi atoms typically occurs at the hAGBs,while the absence of Bi adsorption prevails at LAGBs or *** particular,the segregated Bi at random hAGBs exhibited the directional bilayer adsorption,while the special symmetrical7 hAGB presented a unique Bi-rich cluster *** findings pro-vide a comprehensive experimental and computational understanding on the atomic-scale segregation of impurities in metallic materials.

关键词： Grain boundary character Embrittlement Bi segregation Atomic configuration Ultrahigh-purity copper

EMBRITTLEMENT OF A cr-Mo LOW-ALLOY STEEL DUE TO LOW-TEMPERATURE NEUTRON IRRADIATION

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 20-26页

作者： S.h. song L. Q. Weng Department of Materials Science and Engineering Shenzhen Graduate School HarbinInstitute of Technology Shenzhen 518055 China

Embrittlement of a cr-Mo2.25crlMo steel stemming from neutron irradiation at 270℃ is studied by virtue of small punch testing in conjunction with scanning electron microscopy. The ductile-brittle transition temperature determined by the small punch test is much lower than that determined by the standard charpy test. There is some irradiation-induced embrittlement effect after the steel is irradiated for 46 days with a neutron dose rate of 1.05×10^18dpa/s （displacement per atom per second）.

关键词： irradiation embrittlement segregation low alloy steels pressure vessel

A functional tacrolimus-releasing nerve wrap for enhancing nerve regeneration following surgical nerve repair

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Neural Regeneration Research 2025年第1期20卷 291-304页

作者： Simeon c.Daeschler Katelyn J.W.So Konstantin Feinberg Marina Manoraj Jenny cheung Jennifer Zhang Kaveh Mirmoeini JPaul Santerre Tessa Gordon Gregory hBorschel SickKids Research Institute Neuroscience and Mental Health ProgramTorontoONCanada Institute of Biomaterials and Biomedical Engineering University of TorontoTorontoONCanada Indiana University School of Medicine IndianapolisINUSA Division of Plastic and Reconstructive Surgery the Hospital for Sick ChildrenTorontoONCanada Translational Biology and Engineering Program Ted Rogers Centre for Heart ResearchInstitute of Biomedical EngineeringFaculty of DentistryUniversity of TorontoTorontoONCanada

Axonal regeneration following surgical nerve repair is slow and often incomplete,resulting in poor functional recovery which sometimes contributes to lifelong ***,there are no FDA-approved therapies available to promote nerve *** accelerates axonal regeneration,but systemic side effects presently outweigh its potential benefits for peripheral nerve *** authors describe herein a biodegradable polyurethane-based drug delivery system for the sustained local release of tacrolimus at the nerve repair site,with suitable properties for scalable production and clinical application,aiming to promote nerve regeneration and functional recovery with minimal systemic drug *** is encapsulated into co-axially electrospun polycarbonate-urethane nanofibers to generate an implantable nerve wrap that releases therapeutic doses of bioactive tacrolimus over 31 *** and drug loading are adjustable for applications in small and large caliber nerves,and the wrap degrades within 120 days into biocompatible *** released from the nerve wrap promotes axon elongation in vitro and accelerates nerve regeneration and functional recovery in preclinical nerve repair models while off-target systemic drug exposure is reduced by 80%compared with systemic *** its surgical suitability and preclinical efficacy and safety,this system may provide a readily translatable approach to support axonal regeneration and recovery in patients undergoing nerve surgery.

关键词： biodegradable local drug delivery nerve injury nerve regeneration nerve wrap tacrolimus