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Oxidation resistant low-alloyed Ti alloys with good ductility

Rare Metals 2024年第8期43卷 3921-3936页

作者： Meng Li Zhang-Zhi Shi Jun-Yi Xu Fu-Zhi Dai Xiang-Min Li Zi-Lin Li lu-ning wang Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advance Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Oxidation resistance enhancement of pure Ti often comes at the cost of reduced ductility,which is frequently the problem through alloying with sole Al,Si,W,Mo and *** overcome the short coming of single element alloying,this paper proposes a multi-element low-alloying strategy to take advantage of synergistic effects and resolve the conflict between oxidation resistance and *** demonstrates that the addition of a small quantity of Ta(0.51wt%)can boost both oxidation resistance and ductility in comparison to pure ***,the combined addition of a small amount(0.54 wt%)of Ta,Nb and Si not only preserves good ductility of pure Ti,but also reduces mass gains to 14%-67%of pure Ti during 100 h oxidation at 650-850℃in *** indicates even better oxidation resistance than that obtained through the use of Ta,Nb,or Nb+Ta *** Ta+Nb+Si alloying creates an oxide layer that is less porous and more resistant to stratification and ***,a 3-μm N-rich layer can form in the Ti substrate beneath the oxide scale,in which phase transformation generates coherent Ti_(2)N with(0001)_(Ti)as the habit plane,with N atoms prefers to diffuse along■than along[0001]_(Ti).The completely transformed Ti_(2)N region or partially transformed Ti+Ti_(2)N region can effectively impede oxygen ***,the multielement low-alloying strategy is promising for enhancing both oxidation resistance and mechanical properties of metallic materials in the future.

关键词： Ti alloys Multi-element Co-alloying Oxidation resistance Mechanical properties

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Multi-objective optimization of three mechanical properties of Mg alloys through machine learning

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Materials Genome Engineering Advances 2024年第3期2卷 83-95页

作者： Wei Gou Zhang-Zhi Shi Yuman Zhu Xin-Fu Gu Fu-Zhi Dai Xing-Yu Gao lu-ning wang State Key Laboratory for Advance Metals and Materials Beijing Advanced Innovation Center for Materials Genome EngineeringSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyangChina Department of Materials Science and Engineering Monash UniversityClaytonVictoriaAustralia Institute of Microelectronics Chinese Academy of SciencesBeijingChina

Conventional trial-and-error method is usually time-consuming and expensive for multi-objective optimization of Mg *** machine learning exhibits great potential to accelerate related research studies,machine learning prediction of properties of Mg alloys is often a prediction of a single target at a *** address this,this paper integrates non-dominated sorting genetic algorithm III multiobjective optimization algorithm with light gradient boosting machine algorithm to simultaneously optimize yield strength,ultimate tensile strength,and elongation of Mg *** is the first time that simultaneous machine learning optimization of these three objectives has been achieved for Mg alloys.

关键词： alloy design machine learning Mg alloys multi-objective optimization

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Effects of γ-Ray Irradiation on the Fatigue Strength, Thermal Conductivities and Thermal Stabilities of the Glass Fibres/Epoxy Resins Composites

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Acta Metallurgica Sinica(English Letters) 2018年第1期31卷 105-112页

作者： Li-Fang Zheng lu-ning wang Zhao-Zhong wang Li wang School of Mechanical Engineering University of Science and Technology Beijing School of Materials Science and Engineering University of Science and Technology Beijing

Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the 3,-ray irradiation on the fatigue strength, thermal conductivities and thermal stabilities of the glass fibres/epoxy resins composites were investigated. And a two-parameter fatigue life model was established to predict the fatigue life of the composites. Results revealed that the y-ray irradiation could probably result in the degradation of epoxy resins, but hardly damage to the glass fibres. And the γ-ray irradiation treatment could significantly affect the fatigue strength of the composites at a low-cycle fatigue stage, but seldom influence at a high-cycle fatigue stage. Furthermore, the fabricated glass fibres/epoxy resins composites after the γ-ray irradiation still presented excellent fatigue strength, ideal thermal conductivities, remarkable dimensional and thermal stabilities, which can meet the actual requirements of normal operation for supporting instruments under high-energy and nuclear physics experiments.

关键词： Epoxy resins composites Glass fibres Fatigue strength γ-Ray irradiation Thermal stabilities

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高度灵活可控的多孔MOF膜用于高效药物释放

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Science China Materials 2024年第5期67卷 1509-1520页

作者：李家馨鄢亚超房庆霖陈颖芝景启航 Hiang Kwee Lee 王鲁宁 School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Shunde Graduate School of University of Science and Technology Beijing FoshanGuangdong528399China School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang LinkSingapore637371Singapore

具有生物力学和生化活性的敷料在伤口护理和皮肤组织再生中起着至关重要的作用.然而,机械失配和药物释放管理所涉及的问题限制了当前敷料的有效使用.在本工作中,我们报道了一种简单的策略,即采用聚偏二氟乙烯(PVDF)作为底物,通过嵌入不... 详细信息

具有生物力学和生化活性的敷料在伤口护理和皮肤组织再生中起着至关重要的作用.然而,机械失配和药物释放管理所涉及的问题限制了当前敷料的有效使用.在本工作中,我们报道了一种简单的策略,即采用聚偏二氟乙烯(PVDF)作为底物,通过嵌入不同尺寸的沸石咪唑酸盐框架(ZIF-8)种子,以推动具有均匀蜂窝结构的高柔性金属有机框架(MOF)复合膜的受控生长,用于药物负载和释放.以嵌入的种子为控制中心,形成的多孔膜具有约0.7-3μm的宽孔隙.这种可调节的微尺度孔与ZIF-8中的固有纳米孔不仅可以有效地提高抗炎类药物的负载(姜黄素,CCM),而且还能够快速并可控地释放药物,大大提高了抗菌活性,同时促进细胞生长.其中,在40 nm种子上生长的0.7μm多孔膜的表现优于其他蜂窝膜,与2μm多孔膜(相当于裸PVDF基质)相比,细胞增殖能力提高了约2倍,针对金黄色葡萄球菌(***)和大肠杆菌(***)的抗菌活性分别提高了5倍和2.4倍,是基底抗菌活性的5倍,这是因为这种最佳孔几何结构具有CCM和Zn2+释放特性的平衡效应.这种可控分层孔阵列膜的独特性质有望真正用于伤口愈合,同时也为生物医学设计提供了新的指导.

关键词： MOF membrane hierarchical pores controllable drug release cytocompatibility

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Fabrication and characterization of anodic oxide nanotubes on TiNb alloys

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Rare Metals 2016年第2期35卷 140-148页

作者： Ming Jin Xin lu Yi Qiao lu-ning wang Alex A.Volinsky School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Department of Mechanical Engineering University of South Florida

Titanium and its alloys have been extensively used as implant materials owing to their high specific strength, good biocompatibility and excellent corrosion resistance. Oxide nanotubular array layer can be formed on Ti alloy surface by electrochemical anodization treatment. In this work, the morphology of nanotubes formed on Ti-Nb alloys（Nb content of 5 wt%, 10 wt%, 20 wt%, 30 wt% and40 wt%） was investigated using an electrolyte containing ethylene glycol and NH_4 F. Oxide layers consisting of highly ordered nanotubes with a range of diameters（approximately40-55 nm for the inner diameter and 100-120 nm for the outer diameter） and lengths（approximately 10-20 lm） can be formed on alloys in the Ti-x Nb system, independent on the Nb content. The nanotubes formed on the Ti-Nb alloy surface were transformed from the anatase to rutile structure of titanium oxide. The oxide nanotubular surface is highly hydrophilic compared with the intact Ti Nb foil. The surface wettability varies with the nanotube diameter. As the nanotube diameter increases while the nanotube layer thickness remains constant, the capillary wetting of the nanotube surface decreases and the surface becomes less *** changes the nanotubular surface wettability further and establishes less hydrophilic surface conditions due to the removal of hydroxyl groups and residue fluoridecontaining species. It is believed that the surface wettability is changed due to the decreasing content of hydroxyl groups in ambient atmosphere. This work can provide guidelines for improving structural and environmental conditions responsible for changing surface wettability of Ti Nb surfaces for biomedical applications.

关键词： Ti-Nb alloy Anodization Nanotubes Wettability Implants

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Zn-0.8Mn alloy for degradable structural applications:Hot compression behaviors,four dynamic recrystallization mechanisms,and better elevated-temperature strength

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Journal of Materials Science & Technology 2023年第6期137卷 159-175页

作者： Meng Li Zhang-Zhi Shi Qiang wang Yang Cheng lu-ning wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Environmentally degradable Zn-0.8Mn alloy is highly ductile,which lays the foundation for developing high-performance Zn-Mn-based ***,not only constitutive equation of this alloy is unknown,but also its dynamic recrystallization(DRX)behavior is unclear,which makes optimization of hot pro-cessing parameters of this alloy almost dependent on *** work aims to tackle these *** constitutive equation was deduced to be˙ε=1.38×10^(12)×[sinh(0.009σ)]^(8)exp(-135150/RT).A processing map of the alloy was obtained for the first time,which shows that it has excellent hot formability with narrow instability *** a final true strain of 0.8,the volume fraction of DRX grains increased from 37%to 79%with temperature increasing from 150℃to 350℃and strain rate decreas-ing from 10 s^(−1)to 10^(-3)s^(−1).Discontinuous DRX(DDRX),continuous DRX(CDRX),twinning-induced DRX(TDRX),and particle stimulated nucleation(PSN)were activated during hot *** was al-ways the main *** was completely suppressed at 300℃and *** arose from dis-persed MnZn 13 ***,Zn-0.8Mn alloy exhibited elevated-temperature strengths better than pure Zn and Zn-Al-based *** 300℃and 0.1 s^(−1),its peak stress was 1.8 times of pure Zn,owing to MnZn 13 particles of 277±79 nm impeding the motion of grain boundaries and dislocations.

关键词： Environmentally degradable Zn-0.8Mn alloy Hot deformation DRX Constitutive equations Microstructure

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Fatigue and corrosion fatigue behaviors of biodegradable Zn-Li and Zn-Cu-Li under physiological conditions

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Journal of Materials Science & Technology 2022年第36期131卷 48-59页

作者： Huafang Li Yan Huang Xiaojing Ji Cuie Wen lu-ning wang Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China School of Engineering RMIT UniversityMelbourneVictoria 3001Australia

Zinc(Zn)alloys are emerging as a new class of biodegradable metallic materials due to their good biocompatibility,suitable biodegradability,and ***,the dynamic loading in the human body,along with the corrosive physiological environment,brings great challenges to the application of biodegradable Zn *** present,there are few reports on the fatigue and corrosion fatigue properties of Zn alloys in simulated body fluid(SBF).In the present work,extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were selected in order to systematically evaluate their fatigue and corrosion fatigue behaviors both in air at ambient temperature and in SBF at 37℃.Results revealed that the fatigue limits of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys were about 135 and 180 MPa,respectively,in air at ambient ***,the fatigue limits of the two alloys decreased to 65 and 80 MPa,respectively,in SBF at 37℃and showed a linear relationship between the corrosion fatigue life and the stress *** sources of fatigue cracks in air were internal microstructural defects or weak mechanical properties of the material,while the initiation of corrosion pits on the surface was the main reason for the source of the formation of fatigue cracks in *** fracture mode of the extruded Zn-0.8Li and Zn-2Cu-0.8Li alloys was quasi-cleavage *** to static immersion testing,cyclic loading significantly increased the corrosion rates of the two experimental alloys in a corrosion fatigue environment.

关键词： Biodegradable metals Biomedical applications Corrosion fatigue behaviors Fatigue behaviors Zinc alloys

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Regulation of RAW 264.7 macrophages behavior on anodic TiO2 nanotubular arrays

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Frontiers of Materials Science 2017年第4期11卷 318-327页

作者： Shenglian YAO Xujia FENG Wenhao LI lu-ning wang Xiumei wang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China School of Materials Science anti Engineering Tsinghua University Beijing 100084China

Titanium （Ti） implants with TiO2 nanotubular arrays on the surface could regulate cells adhesion, proliferation and differentiation to determine the bone integra- tion. Additionally, the regulation of immune cells could improve osteogenesis or lead in appropriate immune reaction. Thus, we evaluate the behavior of RAW 264.7 macrophages on TiO2 nanotubular arrays with a wide range diameter （from 20 to 120 nm） fabricated by an electrochemical anodization process. In this work, the proliferation, cell viability and cytokine/chemokine secretion were evaluated by CCK-8, live/dead staining and ELISA, respectively. SEM and confocal microscopy were used to observe the adhesion morphology. Results showed that the small size nanotube surface was benefit for the macrophages adhesion and proliferation, while larger size surface could reduce the inflammatory response. These findings contribute to the design of immune-regulating Ti implants surface that supports successful implantation.

关键词： RAW 264.7 macrophages nanotopography TiO2 nanotubular arrays inflammation

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Fabrication and characterization of novel biodegradable Zn-Mn-Cu alloys

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Journal of Materials Science & Technology 2018年第6期34卷 1008-1015页

作者： Zhang-Zhi Shi Jing Yu Xue-Feng Liu lu-ning wang School of Materials Science and Engineering University of Science and Technology Beijing

Zn-Mn-Cu alloys with micro-alloying of Mn and Cu in Zn are developed as potential biodegradable met- als. Although the as-cast alloys are very brittle, their ductilities are significantly improved through hot rolling. Among the as-cast and the as-hot-rolled alloys, as-hot-rolled Zn-0.35Mn-0.41 Cu alloy has the best comprehensive property. It has yield strength of 198.4 ± 6.7 MPa, tensile strength of 292.4 ± 3.4 MPa, elongation of 29.6 ±3.8% and corrosion rate of 0.050-0.062 mm a^-1. A new ternary phase is characterized and determined to be MnCuZn18, which is embedded in MnZn13, resulting in a coarse cellular/dendritic MnZna3-MnCuZn18 compound structure in Zn-0.75 Mn-0.40Cu alloy. Such a coarse compound structure is detrimental for wrought alloy properties, which guides future design of Zn-Mn-Cu based alloys. The preliminary research indicates that Zn-Mn-Cu alloy system is a promising candidate for potential cardiovascular stent applications.

关键词： Zn alloys Biodegradability Strength Ductility Corrosion behavior

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Progress in organic photocatalysts

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Rare Metals 2018年第1期37卷 1-12页

作者： Ying-Zhi Chen Wen-Hao Li Ling Li lu-ning wang School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Organic materials have advantages of diversity,ease of functionality, self-assembly, etc. The varied mechanistic pathways also make it conceivable to design an appropriate photocatalyst for an identical reaction. From this perspective, organic photocatalysts find wide applications in homogeneous, heterogeneous photocatalysis and photoelectrochemical（PEC） solar cells. In this review, the form of the employed organic photocatalysts ranging from molecules, supported molecules, to nanostructures or thinfilm aggregates will be firstly discussed. Rational design strategies relating to each form are also provided, aiming to enhance the photoenergy conversion efficiency. Finally,the ongoing directions for future improvement of organic materials in high-quality optoelectronic devices are also proposed.

关键词： Organic photocatalysts Homogeneous photocatalysis Heterogenization Organic nanostructures Photoelectrochemical water splitting

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