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Laser powder bed fusion of NiTiFe shape memory alloy via premixed powder: microstructural evolution, mechanical and functional properties

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Rare Metals 2024年第5期43卷 2300-2316页

作者： Bo Yuan Jin-Guo Ge Liang Zhang Hong-Jun Chen Long-Sha Wei Yu-Duo Zhou Run-Hua Song Institute of Intelligent Manufacturing Technology Shenzhen Polytechnic School of Mechanical and Electrical engineering Guilin University of Electronic Technology guangdong Advanced Polymer composite engineeringTechnology research center Shenzhen Academy of Aerospace Technology Jihua Laboratory Testing center Jihua Laboratory

High-cost pre-alloyed powder is the bottleneck problem that limits the widespread application of additivemanufactured shape memory alloys. In this work, the lowcost ternary NiTiFe shape memory alloy is fabricated by laser powder bed fusion (LPBF) technique via mechanically mixed pre-alloy NiTi powder and varying contents pure Fe powder (1, 2, 3 wt%). All NiTiFe alloys show a relative density of up to 99.8%by optimizing the LPBF processing parameters. Owing to the heterogeneous nucleation effect of micron-sized Fe particles, both grain refinement and texture weakening are generated in the NiTiFe alloys, accompanied by the reduction of dislocation density. For the room-temperature mechanical properties,the NiTi-3Fe alloy shows the highest microhardness of HV370, but the fracture strength and elongation reduce to1701 MPa and 23%simultaneously. The evolution of mechanical properties is attributed to the high internal defects, low dislocation density and the incoherent oxide.Moreover, the NiTi-3Fe alloy shows the quasi-linear superelasticity behavior; the superelastic recoverable strain of NiTi-1Fe and NiTi-2Fe decreased with the increase in Fe content. This study provided a new-fangled insight for the development of multi-component NiTi-based shape memory alloys by additive manufacturing.

关键词： Additive manufacturing Shape memory alloy Metal matrix composite Microstructure Mechanical properties

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Influence of carbon addition on mechanical properties of Fe-Mn-C twinning-induced plasticity steels

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Journal of iron and Steel research(International) 2022年第9期29卷 1446-1454页

作者： Peng Fu Zhi-bing Zheng Wei-ping Yang Hao-kun Yang School of engineering Jiangxi Agricultural UniversityNanchang 330045JiangxiChina Institute of New Materials GuangdongAcademy of SciencesGuangdong Provincial iron Matrix Composite Engineering Research CenterGuangzhou 510650GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077.China

Mechanical properties and microstructural evolution of Fe-22Mn-0.6C and Fe-22Mn-1.0C(wt.%)twinning-induced plasticity(TwIP)steels were investigated by monotonic,stress-relaxation and unloading-reloading tensile tests.The dynamic strain aging(DSA)effect,resulting from pinning of dislocations,effectively improved the dislocation activation volume of the two TWIP steels.In the meanwhile,DSA-facilitated twinning nucleation mechanism kept similar twinning capabilities of the two TWIP steels.With strain increasing,the formation of high-density deformation twins restricted the dislocation motion and reduced the activation volume with increasing strain.Furthermore,C addition simultaneously improved the ultimate tensile strength and uniform elongation,and significantly enhanced the friction stress,rather than back stress.The stronger short-range order effect,brought by friction stress,promotes the planar dislocation slipping,thus improving the work-hardening capability.As a result,the additional work-hardening capacity can be achieved in Fe-Mn-C with higher C addition.

关键词： Twinning induced plasticity steel Work-hardening rate Dynamic strain aging Short-range order Deformation twin

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Effects of Ni content and tempering temperatures on microstructure and properties of medium-carbon cast steel

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Journal of iron and Steel research(International) 2023年第8期30卷 1524-1536页

作者： Xiao-bo Cui Tian-long Liu Zhi-bin Zheng Zhi-qiang Guo Kai-hong Zheng Pei-xian Han School of Materials Science and engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Institute of New Materials Guangdong Academy of SciencesNational Engineering Research Center of Powder Metallurgy of Titanium and Rare MetalsGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510651GuangdongChina guangdong provincial iron matrix composite engineering research center Guangzhou 510651GuangdongChina Jiangxi Lianfeng Investment Casting Co. Ltd.Yichun 336300JiangxiChina

The microstructure evolution and properties of medium-carbon cast steel alloyed with different Ni contents after tempering at various temperatures have been investigated.The addition of 0.47-1.59 wt.%Ni content results in the formation of 16%-36% retained austenite(RA).The blocky and irregular-polygonal RA mainly forms along the prior austenite grain boundaries,and the tempering temperature does not affect the RA content.The hardness of medium-carbon cast steel is affected by the precipitation of carbides and the hardness of martensite.Excessive RA content is the main cause of intergranular impact rupture and low impact energy.The long-strip carbides formed after tempering at 320℃ would further reduce the impact energy of medium-carbon cast steel.When tempering at 220 and 380℃,the increase in impact energy is attributed to the formation of rod-like and spherical carbides and the low-carbon martensite.For the medium-carbon cast steel with high impact energy,its impact-abrasive wear resistance is more excellent.Micro-cutting and delamination are the primary wear mechanisms.

关键词： Medium-carbon cast steel Ni content Tempering temperature Hardness Impact energy Impact-abrasive wear resistance

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Corrosion and impact-abrasion-corrosion behaviors of quenching- tempering martensitic Fe-Cr alloy steels

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Journal of iron and Steel research(International) 2022年第11期29卷 1853-1863页

作者： Zhi-bin Zheng Jun Long Yi Guo Hui Li Kai-hong Zheng Yan-xin Qiao Institute of New Materials Guangdong Academy of SciencesGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510650GuangdongChina guangdong provincial iron matrix composite engineering research center Guangzhou 510650GuangdongChina Jiangmen Guangjin Casting and Forging Co. Ltd.Jiangmen 529000GuangdongChina School of Materials Science and engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

The corrosion and impact-abrasion-corrosion behaviors of quenching-tempering Fe-Cr martensitic steels for ball mill liner were investigated in the corrosive slurry of a copper mine compared with high manganese steel.It is found that the corrosion resistance and the protectiveness of the passive film of Fe-Cr martensitic steels became worse when the carbon content increased.The quenching-tempering Fe-Cr martensitic steel showed better impact-abrasion-corrosion resistance in the corrosive slurry compared with the high manganese steel,especially the alloy steel with the carbon content of 0.3 wt.%.The synergistic effect between mechanics and corrosion has also been analyzed to further reveal the impact-abrasion-corrosion mechanism of the steels.The damage from pure mechanics accounted for the largest percentage(over 65%)for all steels,demonstrating that mechanical damage played the most important role in the impact-abrasion-corrosion behaviors of the steels.The impact and cracking resistance of the steel should also be paid special attention during the development of new materials for ball mill liner.

关键词： Mining Abrasive wear Corrosive wear Impact wear Martensitic steel

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Revealing effect of aluminum alloying on work hardening and impact behaviors of low-density Fe-18Mn-1.3C-2Cr-(4,11)Al casting steel

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China Foundry 2022年第4期19卷 359-368页

作者： Zhi-bin Zheng Hao-kun Yang A.P.Shatrava Wai-wah Lai Jun Long Kai-hong Zheng Institute of New Materials Guangdong Academy of SciencesGuangdong Provincial Key Laboratory of Metal Toughening Technology and ApplicationGuangzhou 510650China Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077China Physicotechnological Institute of Metals and Alloys National Academy of SciencesKiev 03142Ukraine National engineering research center of Powder Metallurgy of Titanium&Rare Metals Guangdong Provincial Iron Matrix Composite Engineering Research CenterGuangzhou 510650China

The present study designed two kinds of Fe-18Mn-1.3C-2Cr-(4,11)Al(wt.%)low-density steels.Tensile and impact tests were carried out to evaluate the work hardening and impact toughness properties via aluminum(Al)alloying control.Meanwhile,microstructure evolution and fracture morphology were investigated by X-ray diffraction(XRD),a scanning electron microscope(SEM)equipped with electron backscatter diffraction(EBSD),a transmission electron microscope(TEM),and a stereo-optical microscope(OM).It is found that the Al addition obviously promotes the dislocation planar slipping,resulting in cleavage and brittle impact fracture in 11wt.%Al steel.Besides,the microband-induced plasticity(MBIP)mechanism is found in 4wt.%Al containing steel,introducing considerable work hardening capacity and impact toughness of 156.8±17.4 J.The present study provides a direct illustration of the relationship between work hardening and impact toughness behaviors of these two low-density steels for potential application as impact-resistant components.

关键词： casting steel aluminum work hardening impact toughness tensile fractography impact fractography

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V_(8)C_(7)/C稳定的超细Ru纳米颗粒用于全pH下的析氢反应

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Science Bulletin 2024年第6期69卷 763-771页

作者：龙艳菊沈勇江萍萍苏徽冼家慧孙亚美杨俊宋海利刘庆华李光琴 Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education Lehn Institute of Functional MaterialsGuangdong Provincial Key Laboratory for High Performance Polymeric CompositesInstitute of Green Chemistry and Molecular EngineeringSchool of ChemistrySun Yat-sen UniversityGuangzhou 510006China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Key Laboratory of Light Energy Conversion Materials of Hunan Province College College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China

The development of cost-effective electrocatalysts with high efficiency and long durability for hydrogen evolution reaction(HER)remains a great challenge in the field of water splitting.Herein,we design an ultrafine and highly dispersed Ru nanoparticles stabilized on porous V_(8)C_(7)/C matrix via pyrolysis of the metal-organic frameworks V-BDC(BDC:1,4-benzenedicarboxylate).The obtained Ru-V_(8)C_(7)/C composite exhibits excellent HER performance in all p H ranges.At the overpotential of 40 mV,its mass activity is about 1.9,4.1 and 9.4 times higher than that of commercial Pt/C in acidic,neutral and alkaline media,respectively.Meanwhile,Ru-V_(8)C_(7)/C shows the remarkably high stability in all p H ranges which,in particular,can maintain the current density of 10 m A cm^(-2)for over 150 h in 1.0 mol L^(-1)phosphate buffer saline(PBS).This outstanding HER performance can be attributed to the high intrinsic activity of Ru species and their strong interface interactions to the V_(8)C_(7)/C substrate.The synergistic effect of abundant active sites on the surface and the formed Ru-C-V units at the interface promotes the adsorption of reaction intermediates and the release of active sites,contributing the fast HER kinetics.This work provides a reference for developing versatile and robust HER catalysts by surface and interface regulation for pH tolerance.

关键词： Ruthenium Metal-organic frameworks Transition metal carbides Hydrogen evolution Nanoparticles

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Double crosslinked biomimetic composite hydrogels containing topographical cues and WAY-316606 induce neural tissue regeneration and functional recovery after spinal cord injury

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Bioactive Materials 2023年第6期24卷 331-345页

作者： Xingchang Zhao Xianzhe Lu Kai Li Shiqiang Song Zhaohui Luo Chuanchuan Zheng Chengliang Yang Xiumei Wang Liqiang Wang Yujin Tang Chong Wang Jia Liu Department of Orthopaedics Affiliated Hospital of Youjiang Medical University for NationalitiesBaiseGuangxiChina Guangxi Key Laboratory of Basic and Translational research of Bone and Joint Degenerative Diseases Guangxi Biomedical Materials Engineering Research Center for Bone and Joint Degenerative DiseasesBaiseGuangxiChina Academy of Orthopedics Guangdong ProvinceGuangdong Provincial Key Laboratory of Bone and Joint Degeneration DiseasesThe Third Affiliated Hospital of Southern Medical UniversityGuangzhouChina Youjiang Medical University for Nationalities BaiseGuangxiChina School of Mechanical engineering Dongguan University of TechnologySongshan LakeDongguanGuangdongChina State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijingChina State Key Laboratory of Metal matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

Spinal cord injury(SCI)is an overwhelming and incurable disabling condition,for which increasing forms of multifunctional biomaterials are being tested,but with limited progression.The promising material should be able to fill SCI-induced cavities and direct the growth of new neurons,with effective drug loading to improve the local micro-organism environment and promote neural tissue regeneration.In this study,a double crosslinked biomimetic composite hydrogel comprised of acellularized spinal cord matrix(ASCM)and gelatin-acrylated-β-cyclodextrin-polyethene glycol diacrylate(designated G-CD-PEGDA)hydrogel,loaded with WAY-316606 to activate canonical Wnt/β-catenin signaling,and reinforced by a bundle of three-dimensionally printed aligned polycaprolactone(PCL)microfibers,was constructed.The G-CD-PEGDA component endowed the composite hydrogel with a dynamic structure with a self-healing capability which enabled cell migration,while the ASCM component promoted neural cell affinity and proliferation.The diffusion of WAY-316606 could recruit endogenous neural stem cells and improve neuronal differentiation.The aligned PCL microfibers guided neurite elongation in the longitudinal direction.Animal behavior studies further showed that the composite hydrogel could significantly recover the motor function of rats after SCI.This study provides a proficient approach to produce a multifunctional system with desirable physiological,chemical,and topographical cues for treating patients with SCI.

关键词： Spinal cord injury 3D printing PCL oriented fibers WAY-316606 Wnt/β-catenin signaling

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Fabrication of a sinter-resistant Fe-MFI zeolite dragonfruit-like catalyst for syngas to aromatics conversion

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Journal of Energy Chemistry 2023年第2期77卷 70-79,I0003页

作者： Chenguang Wang Chengyan Wen Zheng Liang Zhipeng Tian Qian Jiang Yuhe Liao Xunzhu Jiang Lungang Chen Qiying Liu Longlong Ma Michiel Dusselier Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640GuangdongChina Southeast University School of Energy and EnvironmentNanjing 210009JiangsuChina center for Sustainable Catalysis and engineering(CSCE) KU LeuvenCelestijnenlaan 200F3001 HeverleeBelgium CAS Key Laboratory of Renewable Energy Guangzhou 510640GuangdongChina guangdong provincial Key Laboratory of New and Renewable Energy research and Development Guangzhou 510640GuangdongChina University of Chinese Academy of Sciences Beijing 100049China

Direct conversion of syngas to aromatics has great potential to decrease fossil fuel dependence.Here,a unique structured hybrid catalyst composed of Fe_(3)O_(4) nanoparticles intimately dispersed inside an acidic zeolite is developed.1 to 4 nm sized Fe_(3)O_(4) nanoparticles end up evenly dispersed in an acidic and slightly mesoporous Al-ZSM-5 based on Fe_(3)O_(4) restructuring during co-hydro thermal synthesis using organosilane modification.A very high aromatic productivity of 214 mmolaromatics h^(-1) gFe^(-1) can be obtained with a remarkable 62%aromatic selectivity in hydrocarbons.This catalyst has excellent sintering resistance ability and maintains stable aromatics production over 570 h.The synthetic insights that postulate a mechanism for the metastable oxide-zeolite reorganization during hydrothermal synthesis could serve as a generic route to sinter-resistant oxide-zeolite composite materials with uniform,well-dispersed oxide nanoparticles in close intimacy with-and partially confined in-a zeolite matrix.

关键词： Syngas Aromatics Sinter resistant Oxide-zeolite catalyst

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Magnetic field regulation of mouse bone marrow mesenchymal stem cell behaviours on TiO2 nanotubes via surface potential mediated by Terfenol‐D/P(VDF‐TrFE) film

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Biosurface and Biotribology 2022年第3期8卷 254-265页

作者： Haisheng Qi Qi Ke Qiwen Tang Lei Yin Lixin Yang Chengyun Ning Jianyu Su Liming Fang School of Materials Science and engineering South China University of TechnologyGuangzhouChina National engineering research center for Tissue Restoration and Reconstruction GuangzhouChina China‐Singapore International Joint research Institute GuangzhouChina School of Mechanical&Automotive engineering South China University of TechnologyGuangzhouChina guangdong provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing GuangzhouChina

It is challenging to match the mutual interactions between implant and host because the biomaterials usually cannot actively adjust their performance to the changing microenvironment.Surface potential is one of the critical factors affecting the bioactivity of biomaterials,but it is difficult to be directly controlled in vivo.Magnetic stimulation has attracted much attention due to its deep penetrability,good reliability,and convenient operability.Here,titanium dioxide(TiO_(2))nanotubes and Terfenol‐D/P(VDF‐TrFE)composite film are prepared by anodic oxidation and solution casting methods on opposite sides of a titanium sheet,respectively.Terfenol‐D magnetostrictive microparticles deform under a magnetic field,generating surface potential on the P(VDF‐TrFE)piezoelectric matrix through magneto‐electric coupling.Correspondingly,equal opposite charges are induced on the surface of TiO_(2) nanotubes.Stem cells cultured on TiO_(2) nanotubes show that cell adhesion,proliferation,and differentiation abilities can be regulated by magnetic strength,which correlates with the absorption of charged proteins.Therefore,a cascade coupling of magnetic,mechanical,electric,biochemical,and cellular effects is established.This work demonstrates the feasibility of regulating the bioactivity of biomaterials in vivo through a magnetic field.

关键词： cell behaviours magnetic stimulation magnetoelectric coupling magnetostriction piezoelectricity surface potential TiO_(2)nanotube

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Unraveling specific role of carbon matrix over Pd/quasi-Ce-MOF facilitating toluene enhanced degradation

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Journal of Rare Earths 2022年第11期40卷 1751-1762,I0003页

作者： Chunjing Su Zhi Li Mengqi Mao Wenhua Ye Jinping Zhong Quanming Ren Hairong Cheng Haomin Huang Mingli Fu Junliang Wu Yun Hu Daiqi Ye Haihong Xu School of Environment and Energy South China University of TechnologyGuangzhou 510006China National engineering Laboratory for VoCs Pollution Control Technology and Equipment(SCUT) Guangzhou 510006China guangdong provincial Key Laboratory of Atmospheric Environment and Pollution Control(SCUT) Guangzhou 510o06China guangdong Conhgin Parovincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal(SCUT)Guangzhou 510006China Appraisal center for Environment&engineering Ministry of Ecology and EnvironmentBeijing 100012China

Metal organic frameworks(MOFs)derivatives represented by quasi-MOFs have excellent physical and chemical properties and can be applied for the catalytic combustion of volatile organic compounds(VOCs).In this work,Pd/quasi-Ce-BTC synthesized by simple one-step Npyrolysis was applied to the oxidation of toluene,showing excellent toluene catalytic activity(T_(90)=175℃,30000 mL/(g·h)).Microscopic analyses indicate the formation and interaction of a carbon matrix composite quasi-MOF structure interface.The results show that the amorphous carbon matrix formed during the partial pyrolysis of Ce-BTC significantly improves the adsorption and activation capacity of toluene in the reaction,and constructs a reductive system to maintain high concentrations of Ce^(3+)and Pd^(0),which can facilitate the activation and utilization of oxygen in reaction.Quasi in-situ XPS proves that carbon matrix is indirectly involved in the activation and storage of oxygen,and Pd^(0)is the crucial active site for the activation of oxygen.Stability and water resistance tests display good stability of Pd/quasi-Ce-BTC.This work provides a potential method for designing quasi-MOF catalysts towards VOCs effective abatement.

关键词： Quasi-MOF Toluene oxidation Carbon matrix Metal nanoparticles Oxygen activation ability Rare earths

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