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Enhanced antibacterial activity,corrosion resistance and endothelialization potential of Ti-5Cu alloy by oxygen and nitrogen plasma-based surface modification

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Journal of Materials Science & Technology 2024年第1期168卷 250-264页

作者： Xiaotong Zhao Jiali Hu Jingjun Nie Dafu Chen gaowu qin Erlin Zhang Key Lab.for Anisotropy and Texture of Materials Education Ministry of ChinaSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China Laboratory of Bone Tissue Engineering Beijing Laboratory of Biomedical MaterialsNational Center for OrthopaedicsBeijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalBeijing 100035China

Antibacterial Ti-5Cu alloy is a promising substitute material for Ti-made cardiovascular implants,so its surface engineering is crucial to expediting clinical *** the antibacterial and cardiovas-cular biological benefits of Cu^(2+)and titanium-nitride-oxide(TiN x O y)coatings,a Cu_(2)O/CuO-TiN x O y coating with upregulated Cu^(2+)release was successfully deposited on Ti-5Cu alloy for the first time using oxygen and nitrogen plasma-based surface *** superhydrophilic and nanostructured Cu_(2)O/CuO-TiN x O y coating had a dense structure and was well bonded to the substrate,resulting in enhanced cor-rosion resistance,while CuO/Cu_(2)O in the coating released Cu^(2+)faster than Ti_(2)Cu phase in the *** gratifying,the coating demonstrated perfect antibacterial properties(R>99.9%against ***),owing primarily to direct contact sterilization of Cu_(2)O/*** most encouraging phenomenon was that the coating dramatically accelerated HUVEC adhesion(1.4 times),proliferation(RGR:106%-116%),and particularly migration(RMR:158%-247%)compared with the control *** coating extract also signifi-cantly stimulated in vitro angiogenesis *** rapid endothelialization for Cu_(2)O/CuO-TiN x O y coating was attributed to the surface nanostructure and Cu^(2+)/NO_(2)−release,which upregulated the angiogenesis-related gene expression of HIF-1α,VEGF,and eNOS to increase VEGF secretion and NO *** of the findings indicated that the Cu_(2)O/CuO-TiN x O y coating could enhance the corrosion resistance,an-tibacterial properties,and endothelialization potential of Ti-Cu alloy,displaying great clinical potential in cardiovascular applications.

关键词： Titanium-copper alloy Titanium-nitride-oxide(TiNxOy) Cu^(2+)release Antibacterial property Cell compatibility

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Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 999-1006页

作者： Sen Wang Hucheng Pan Caixia Jiang Zhihao Zeng Zhen Pan Weineng Tang Chubin Yang Yuping Ren gaowu qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China Mg and Mg Alloy Institute Technology CenterBaosteel Metal Co.LtdChina Baowu Steel GroupShanghai200940China Jiangxi Provincial Engineering Research Center for Magnesium Alloy Gannan Normal UniversityGanzhou341000China

In this work,the microstructure and mechanical properties of large cross-sectioned Mg-9Gd-3Y-1.2Zn-0.5Zr(VWZ931)samples produced by the small extrusion ratio has been *** as-extruded VWZ931 sample with diameter of~30 mm can exhibit the high yield strength(YS)of 339 MPa,ultimate tensile strength(UTS)of 387 MPa and elongation of 8.2%,*** peak-aged,the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 *** small extrusion ratio leads to the low fraction of dynamic recrystallized(DRX)grains in VWZ931 sample,and the texture hardening effect can be fully utilized to achieve high *** combined effect of precipitation strengthening due to the long-period stacking ordered phases and theβ′phase,grain boundary strengthening due to the fine DRX grains,heterogeneous deformation-induced strengthening caused by bimodal microstructure,can together contribute to the high strength of present Mg *** findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

关键词： Mg-RE alloy Mechanical property Bimodal grains Texture hardening

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预变形Mg-Nd合金时效析出行为的原子尺度

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材料与冶金学报 2024年第2期23卷 164-172页

作者：郭文祥谢红波任玉平秦高梧东北大学材料科学与工程学院沈阳110819 东北大学材料各向异性与织构教育部重点实验室沈阳110819

使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)系统研究了预变形Mg-20%Nd(质量分数)合金250℃等温时效2 h后的时效析出行为结果表明,预变形产生的位错促进了第二相的形核,导致高密度且有别于传统沿{101-0}α惯习面均匀分布的亚... 详细信息

使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)系统研究了预变形Mg-20%Nd(质量分数)合金250℃等温时效2 h后的时效析出行为结果表明,预变形产生的位错促进了第二相的形核,导致高密度且有别于传统沿{101-0}α惯习面均匀分布的亚稳析出相的形成原子尺度的表征结果表明,合金内部形成的析出链主要由βS′相和β1相组成此外,析出链中还含有少量的β″和βH′相,以及βL′相这些片状或透镜状的βS′和β1相与α-Mg基体完全共格,且均具有一个{101-0}α的惯习面,但沿[112-0]α,[12-10]α和[2-110]α3个方向非均匀分布这些结果有望为形变调控合金的析出行为,提升合金力学性能提供理论指导.

关键词：镁合金变形时效硬化析出 HAADF-STEM

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A nano-structured TiO_(2)/CuO/Cu_(2)O coating on Ti-Cu alloy with dual function of antibacterial ability and osteogenic activity

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Journal of Materials Science & Technology 2022年第2期97卷 201-212页

作者： Yuan Zhang Shan Fu Lei Yang gaowu qin Erlin Zhang Key Laboratory for Anisotropy and Texture of Materials(MoE) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

Bacteria-associated infection and poor osseointegration are two main reasons for orthopedic implant ***-Cu alloy exhibited excellent antibacterial property,but still presented unsatisfied osteogenic ***,Ti-Cu alloy was surface modified by an alkali-heat treatment in this paper to improve the osteogenic ability without reduction in antibacterial ability.A TiO_(2)/CuO/Cu_(2)O composite coating with nanostructure was deposited on Ti-Cu *** coating showed increased roughness and great *** tests indicated that the modified Ti-Cu alloy exhibited stronger antibacterial ability against Staphylococcus aureus(***)than Ti-Cu ***,cell experiments demonstrated that the composite coating promoted initial adhesion and spreading of MC3T3-E1 cells,enhanced alkaline phosphatase(ALP)activities as well as extracellular matrix(ECM)mineralization,and significantly upregulated osteogenesis-related gene *** was suggested that the nano-structured TiO_(2)/CuO/Cu_(2)O coating on Ti-Cu alloy might provide a potential strategy for orthopedic implant failure.

关键词： Ti-Cu alloy Alkali-heat treatment Antibacterial property Osteogenic activity

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低温挤压Mg-Sm-Ce系合金的微观组织与力学性能研究

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航空制造技术 2024年第8期67卷 14-21页

作者：潘虎成蒋彩霞张元王森杜森任玉平秦高梧东北大学材料科学与工程学院沈阳110819 东北大学材料各向异性与织构教育部重点实验室沈阳110819

大幅提升低成本变形镁合金的绝对强度是轻合金研究领域的关键瓶颈问题之一。本研究基于相图计算设计了一种包含低含量轻稀土元素的新型Mg-Sm-Ce-Mn系合金,通过低温挤压实现了近400 MPa的超高强度。Mg-0.8Sm-0.4Ce-0.4Mn(EM10,质量分数,%... 详细信息

大幅提升低成本变形镁合金的绝对强度是轻合金研究领域的关键瓶颈问题之一。本研究基于相图计算设计了一种包含低含量轻稀土元素的新型Mg-Sm-Ce-Mn系合金,通过低温挤压实现了近400 MPa的超高强度。Mg-0.8Sm-0.4Ce-0.4Mn(EM10,质量分数,%)合金经低温挤压后形成了双组态晶粒组织,并表现为典型的丝织构,动态析出了Mg41(Ce,Sm)5和Mg12Ce微米第二相;低的挤压温度及高密度纳米第二相的析出,促进EM10合金的再结晶晶粒尺寸细化至约0.93μm,同时在未再结晶区域内残留有高密度的残余位错;细晶强化、第二相强化、织构强化及位错强化的综合作用,使EM10合金的屈服强度可高达约379 MPa,同时保持约4.7%的延伸率。继续提升Ce和Sm元素的含量,会引入更多的脆性微米级第二相,将损伤合金的塑性。因此,通过低温挤压工艺和成分优化,设计制备出了一种高强度Mg-0.8Sm-0.4Ce-0.4Mn合金,相关结果可为低合金化、超高强度变形镁合金的制备提供理论指导。

关键词：变形镁合金挤压变形力学性能第二相低合金化

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Mg-Zn基合金中非周期性析出相的原子尺度

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材料与冶金学报 2024年第1期23卷 65-72页

作者：姜景春李姗姗谢红波任玉平秦高梧东北大学材料科学与工程学院沈阳110819 东北大学材料各向异性与织构教育部重点实验室沈阳110819 沈阳化工大学机械与动力工程学院沈阳110142

时效析出相的结构是主导合金强度提升的关键,因此从原子尺度认识析出相的结构出发,有助于更好地设计新合金.使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)结合选区电子衍射(SAED)技术系统表征了峰时效Mg-Zn(-Al)系合金中的非周... 详细信息

时效析出相的结构是主导合金强度提升的关键,因此从原子尺度认识析出相的结构出发,有助于更好地设计新合金.使用球差校正的高角环形暗场扫描透射电镜(HAADF-STEM)结合选区电子衍射(SAED)技术系统表征了峰时效Mg-Zn(-Al)系合金中的非周期性析出相结构.研究结果表明,Mg-8Zn二元合金等温时效析出的棒状相是由72°菱形和72°等边六边形结构单元在(0001)α面上沿5个方向拼砌形成的,具有带Laves晶体特征的纳米畴结构.Al的添加可以显著改变Mg-Zn合金的时效析出行为,Mg-8Zn-4Al合金中析出了两种非周期性结构:一种是由36°菱形、72°菱形和72°等边六边形等结构单元自适应组装形成的块状析出相,其伪10次轴完全平行于[0001]α方向;还有一种是菱形的三维二十面体准晶相,其5次轴完全平行于[0001]α方向.这些原子尺度的相结构信息不仅可以增进人们对凝聚态物质结构的认识,还可为设计高强度的ZK,AZ系列镁合金提供理论依据.

关键词：镁合金时效析出非周期性结构准晶 Laves相 HAADF-STEM

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Enhancing the mechanical performance of Al-Zn-Mg alloy builds fabricated via underwater friction stir additive manufacturing and post-processing aging

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Journal of Materials Science & Technology 2022年第13期108卷 26-36页

作者： Changshu He Ying Li Jingxun Wei Zhiqiang Zhang Ni Tian gaowu qin Xiang Zhao School of Materials Science&Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

Our previous studies have demonstrated that underwater friction stir additive manufacturing(FSAM)could effectively suppress the macroscale softening of the fabricated Al-Zn-Mg-Cu alloy build from top to ***,the accompanying local softening problem,i.e.,a low-hardness region at the bottom of each stir zone,becomes *** this study,an Al-Zn-Mg alloy with low quench sensitivity was used to fabricate a multilayered build via underwater ***-process water cooling could effectively solve the macroscale and local softening problems in the FSAM of the Al-Zn-Mg alloy and improve the mechanical performance of the *** microhardness and ultimate tensile strength(UTS)of the water-cooled build in as-fabricated and aged states were more uniform along the building direction and higher than those of their *** 90 days of natural aging,the UTS of the water-cooled build in building and traveling directions reached 398 and 400 MPa,respectively,slightly higher than that of the base metal(392 MPa).The enhancement in the mechanical performance of the water-cooled build was attributed to a high degree of supersaturation and age-strengthening ability because of a high cooling rate of the underwater FSAM process and low quench sensitivity of the base metal.

关键词： Additive manufacturing Friction stir additive manufacturing Water cooling Al-Zn-Mg alloy Microstructure Mechanical property

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Hot-top direct chill casting assisted by a twin-cooling field:Improving the ingot quality of a large-size 2024 Al alloy

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Journal of Materials Science & Technology 2022年第17期112卷 114-122页

作者： Cheng Zhu Zhihao Zhao qingfeng Zhu Gaosong Wang Yubo Zuo Qiangqiang Li gaowu qin Research Center for Metallic Wires School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Key Laboratory of Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Microstructure inhomogeneity and negative segregation have long been challenges for large-size alloy ingots,directly affecting the downstream processing and final performance of ***,we used2024 aluminum alloy as a model alloy to propose a technique,named double-cooling field casting,i.e.,one 2024 Al alloy rod(Φ20 mm)at room temperature was introduced into the melt along the central axis of the hot-top with the protection of a thermal-insulation tube during the direct chill(DC)casting process of aΦ300 mm 2024 Al alloy *** results show that the introduction of the same alloy solid insert has a remarkable influence on refining grains in the center region of the ingot,reducing negative centerline segregation and decreasing the depth of the center part of the *** the application of the 2024 Al insert,the mean size of equiaxed grains at the center part of the ingot decreased from1204±132μm to 721±69μ*** relative deviation of the Cu and Mg main solutes reduced from-0.062 and-0.054 to-0.03 and-0.024,respectively,and the sump depth decreased from 280 mm to242 ***,the shape of the solidification front was changed from‘V’-shaped to‘W’-*** ingot quality was thus improved,mainly arising from the dissolution of the cold 2024 Al insert at a proper position of the hot-top counteracting some latent heat of solidification of the ingot,dissipating the heat of the central part of the hot-top by conducting the 2024 Al insert to the outside,and providing extra-nuclei from the unmoltenα-Al particles of the insert.

关键词： Aluminum alloy DC casting Solid insert Grain refinement Macrosegregation

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Far-from-equilibrium electrosynthesis ramifies high-entropy alloy for alkaline hydrogen evolution

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Journal of Materials Science & Technology 2023年第35期166卷 234-240页

作者： Yunan Wang Hao Yang Zhe Zhang Xiangying Meng Tao Cheng gaowu qin Song Li Key Lab for Anisotropy and Texture of Materials(MoE) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)provide an ideal platform for developing highly active electrocatalysts and investigating the synergy of mixed ***-from-equilibrium synthesis holds great potential for fabricating HEAs at the nanoscale by rapidly shifting the thermodynamic conditions and manipulat-ing the growth *** far-from-equilibrium synthesis of nanomaterials has been successful un-der thermochemical conditions,it is markedly challenging under electrochemical environments,as the use of an electrolyte limits the accessible temperature window and the temporal tunability of ***,we demonstrate that applying a large electrochemical overpotential would create a far-from-equilibrium condition as changing the temperature of the system by considering the equation △G=△H−T△S+nF△ψ.An electrochemical far-from-equilibrium approach is thus setup for construct-ing hierarchical and self-supporting high-entropy alloy *** large overpotential drives the simultaneous reduction of multiple cations and the subsequent formation of a single-phase *** a proof-of-concept,hierarchical Fe_(0.22)Co_(0.18)Ni_(0.18)Cr_(0.14)Cu_(0.28)was fabricated and used as an electrocatalyst for the hydrogen evolution reaction in alkaline *** noble-metal-free HEA exhibits an overpoten-tial of 84 mV at a current density of 10 mA cm^(-2),which is among the lowest even compared to noble metal-based *** work opens a new avenue for building a variety of HEAs for energy and catalysis applications.

关键词： High-entropy alloys Nanostructures Electrocatalysis Hydrogen evolution reaction Far-from-equilibrium synthesis

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Improvement of microstructure and fatigue performance of wire-arc additive manufacture d 4043 aluminum alloy assiste d by interlayer friction stir processing

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Journal of Materials Science & Technology 2023年第2期133卷 183-194页

作者： Changshu He Jingxun Wei Ying Li Zhiqiang Zhang Ni Tian gaowu qin Liang Zuo School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

To expand the application of wire-arc additive manufacturing(WAAM)in aluminum alloy forming com-ponents,it is vitally important to reduce the porosity,refine microstructure,and thereby improve the mechanical properties of the *** this study,the interlayer friction stir processing(FSP)tech-nique was employed to assist the WAAM of 4043 Al-Si alloy,and the related effects on the microstruc-ture evolutions and mechanical properties of the fabricated builds were systematacially *** compared to the conventional WAAM processing of Al-Si alloy,it was found that the introduction of in-terlayer FSP can effectively eliminate the pores,and both theα-Al dendrites and Si-rich eutectic network were severely broken up,leading to a remarkable enhancement in ductility and fatigue *** average yield strength(YS)and ultimate tensile strength(UTS)of the Al-based components produced by the combination of WAAM and interlayer FSP methods were 88 and 148 MPa,***,the elongation(EL)of 37.5%and 28.8%can be achieved in the horizontal and vertical directions,*** anisotropy of EL was attributed to the inhomogeneous microstructure in the stir zone(SZ).Notably,the stress concentration can be effectively reduced by the elimination of porosity and Si-rich eu-tectic network fragmentation by the interlayer FSP,and thus the fatigue behavior was improved with the fatigue strength and elongation increased by∼28%and∼108.7%,*** is anticipated that this study will provide a powerful strategy and theoretical guidance for the WAAM fabrication of Al-based alloy components with high ductility and fatigue performance.

关键词： Wire-arc additive manufacturing(WAAM) Friction stir processing(FSP) Aluminum alloy Microstructure evolution Fatigue performance

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