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Evaluation of high-temperature tensile behavior for metal foils by a novel resistance heating assisted tensile testing system using samples with optimized structures

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Journal of Materials Science & Technology 2021年第35期94卷 216-229页

作者： Qiu Zheng tsuyoshi furushima Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1 KomabaMeguro 153-8505TokyoJapan

To evaluate the tensile behavior of metal foils by resistance heating(RH)assisted tensile testing system accurately,this study proposed to embed a digital image correlation(DIC)system with laser speckles for the measurement of full-field strain ***,the sample structures were optimized to achieve uniform temperature and strain *** infrared camera was used to monitor the temperature *** samples instead of dog-bone shaped samples were proposed.A model for calculating the temperature distribution was established to optimize the sample *** parameters that influence the temperature distribution and tensile behavior were *** results,compared to the strain measured by a non-contact extensometer,the maximum deviation of the strain measured by DIC was less than 6%when the nominal strain was larger than *** is confirmed that the proposed tensile testing system is reliable for measuring the temperature and full-field strain *** shape influenced temperature distributions of smaller samples while it almost had no influence on the temperature distributions of larger *** temperature difference was not affected by the material type but by the sample *** proposed rectangular shape was validated to be feasible for RH assisted tensile *** sample length was successfully optimized for a more uniform temperature distribution by the established *** the tensile deformation was not influenced by the sample shape,the temperature distribution resulted in a non-uniform strain distribution before achieving ultimate tensile *** effective sample length between two clamping jigs contributed to a more uniform temperature distribution and material deformation.A more accurate evaluation of high-temperature tensile behavior for metal foils can be achieved by the proposed RH assisted tensile testing system using rectangular samples with an optimized structure.

关键词： High temperature Metal foil Resistance heating Sample structure Tensile behavior

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Continuous observation of twinning and dynamic recrystallization in ZM21 magnesium alloy tubes during locally heated dieless drawing

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Journal of Magnesium and Alloys 2022年第3期10卷 791-805页

作者： Peihua Du Shusaku Furusawa tsuyoshi furushima Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1KomabaMeguroTokyo 153-8505Japan

Compared to cold drawing,dieless drawing has shown great potential for manufacturing biodegradable Mg alloy microtubes due to the large reduction in area acquired in a single ***,owing to the local heating and local deformation,the deformation mechanism during dieless drawing is not clear,and thus causing difficulties in controlling the microstructure of dieless drawn *** the purpose of acquiring a desired *** this study the deformation mechanism of ZM21 Mg alloy tube was clarified by conducting continuous observation of the microstructural evolution during dieless *** results show that both SRX and DRX occurred during dieless *** occurred before the plastic deformation to soften dieless drawn *** increase of feeding speed,the deformation mechanism changed accordingly:(1) At the low-speed of 0.02 mm/s,the deformation mechanism was dominated by twin-slip sliding,during which {10-12} tension twins were generated inside grains to accommodate the plastic deformation by changing the crystal orientation.(2) At the intermediate-speed of 2 mm/s,a twin-DRX process related to {10-12} tension twin was observed,which was characterized by the generation of abundant {10-12} tension twins and the evolution of misorientation angle of {10-12} tension ***,the transformation from twin-DRX to CDRX can be observed at the late stage of plastic deformation,which was attributed to the inhomogeneous conditions of dieless drawing.(3) At the high-speed of 5 mm/s,a CDRX process was observed,during which grain boundary sliding and grain tilting were observed,in addition to the gradual rotation of *** results show that during dieless drawing,DRX is not only a temperature-dependent phenomenon,but also influenced by the variation of feeding speed.

关键词： Dieless drawing Inhomogeneous condition Twining Dynamic recrystallization Microstructure evolution Magnesium alloy Twinning

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Effect of microstructure on outer surface roughening of magnesium alloy tubes in die-less mandrel drawing

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Journal of Magnesium and Alloys 2022年第10期10卷 2730-2744页

作者： Takuma Kishimoto Peihua Du tsuyoshi furushima Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1 KomabaMeguroTokyo 153-8505Japan

The crystal orientation and outer surface roughening of magnesium alloy tubes were evaluated to clarify the effect of the mandrel on the microstructure and outer surface roughness in die-less mandrel drawing. Locally heated ZM21 tubes with an outer diameter of 6.0 mm and an inner diameter of 3.8 mm were drawn with and without a mandrel. The outer surface roughness and crystal orientation were evaluated in the same measurement area. The results indicated that the outer surface becomes rougher in the die-less mandrel drawing than in die-less drawing for a given outer circumferential strain. The outer surface roughness developed when there was large difference in the pyramidal slip system Schmid factor. Therefore, the slip deformation of the pyramidal slip system seems to be mainly responsible for the outer surface roughening in the die-less mandrel drawing. Furthermore, the crystal grain with the {2110} crystal plane vertical to the normal direction of outer surface had a larger Schmid factor than the other crystal grains. The large number of crystal grains with the {2110} crystal plane in the die-less mandrel drawing is one of the reasons that the outer surface roughness develops more in the die-less mandrel drawing than in die-less drawing for a given outer circumferential strain. These results will contribute significantly to the development of fabrication process of the microtube with high surface quality, which prevents rapid corrosion of biomedical applications.

关键词： Tube forming Die-less drawing Surface roughness Crystal plasticity Magnesium alloy Electron backscatter diffraction

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Microstructure and performance of biodegradable magnesium alloy tubes fabricated by local-heating-assisted dieless drawing

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Journal of Magnesium and Alloys 2020年第3期8卷 614-623页

作者： Peihua Du Shusaku Furusawa tsuyoshi furushima Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1KomabaMeguroTokyo 153-8505

Magnesium(Mg)alloy stents are expected to be the next generation of stents because of good biocompatibility and *** with cold drawing,dieless drawing with local heating is an effective method for manufacturing the Mg alloy microtubes since a large reduction in area can be achieved in a single ***,the microstructure and properties of dieless drawn tubes have not been clarified,leading to the problems in practical application of dieless drawn *** this study,the microstructure and performance of dieless drawn tubes are *** results show that temperature and speed in the dieless drawing process are two factors in determining the grain size of dieless drawn tubes since decreasing the temperature or increasing the speed promotes the generation of fine-grained *** are also generated during the dieless drawing process,which 1)disintegrates grains leading to refinement and 2)causes Hall-Petch law effect on dieless drawn *** tests show that grain size is the main factor in determining the mechanical properties of dieless drawn tubes,namely,0.2%proof stress 135-180MPa,ultimate tensile strength(UTS)200-250MPa,and elongation 8-12%.In 0.9 wt%NaCl solution,localized corrosion is the key factor in initiating the corrosion of dieless drawn tubes,but refined grains and fewer twins can alleviate local *** results imply that dieless drawn tubes are promising in the clinical application of Mg alloy stents for cardiovascular disease.

关键词： Dieless drawing Magnesium alloy tube Microstructure Mechanical properties Corrosion properties

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In vitro corrosion properties of HTHEed Mg-Zn-Y-Nd alloy microtubes for stent applications:Influence of second phase particles and crystal orientation

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Journal of Magnesium and Alloys 2022年第5期10卷 1286-1295页

作者： Peihua Du Di Mei tsuyoshi furushima Shijie Zhu Liguo Wang Yifan Zhou Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced magnesium Alloys Zhengzhou 450002China Key Laboratory of Advanced Materials Processing and Mold Ministry of Education Zhengzhou 450002China Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1KomabaMeguroTokyo 153-8505Japan Magnesium Innovation Centre-MagIC Institute of Materials ResearchHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany

Magnesium(Mg)alloys are promising materials for cardiovascular stent applications due to their good biocompatibility and ***,in vitro and in vivo corrosion tests reveal that Mg alloy stents suffer from a rapid corrosion rate and severe localized corrosion,which is limiting their widespread *** solve the problem of uneven degradation of stents,a HTHE(long-time and high-temperature heat treatment,large-reduction-ratio hot extrusion)process is used to manufacture Mg-Zn-Y-Nd alloy microtubes in this *** heat treatment is to dissolve alloying elements and reduce the size of SPPs,and the hot extrusion is to acquire fine-grained and strongly textured *** microstructural characterization shows that coarse second phases in as-cast alloy are refined and uniformly distributed in matrix of *** hot extrusion,microtubes show strong texture with basal plain oriented parallel to the longitudinal section(LS).The corrosion testing indicates that severe localized corrosion occurs on the cross section(CS)while localized corrosion is alleviated on the *** on the different corrosion properties of the LS and CS,HTHEed microtubes are promising for solving the problems of rapid corrosion rate and severe localized corrosion of Mg alloy stents.

关键词： Mg-Zn-Y-Nd alloy Microtubes Heat treatment Hot extrusion Corrosion properties Cardiovascular stent

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Microstructure and mechanical properties evolution of 65Cu-35Zn brass tube during cyclic rotating−bending process

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Transactions of Nonferrous Metals Society of China 2022年第11期32卷 3610-3622页

作者： Zi-cheng ZHANG tsuyoshi furushima Ken-ichi MANABE School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of TokyoKomaba 4-6-1MeguroTokyo 153-8505Japan Department of Mechanical Engineering Tokyo Metropolitan University1-1 Minami-OsawaHachioji-shiTokyo 192-0397Japan

The cyclic rotating−bending(CRB)processes under different deformation conditions were carried out to refine the microstructure and improve the mechanical properties of the 65Cu−35Zn brass *** microstructure and the mechanical properties in the axial direction of the tubes after the CRB process were studied with the OM,EBSD and conventional tensile *** obtain the accumulated effective plastic strain of the tube during the CRB process,the FEM simulation was also *** results show that the average grain size decreases with the increase of rotation time at RT,and with the decrease of bending angle at 200℃.With the increase of accumulated effective plastic strain during the CRB process,the reduction rate of average grain size of the brass tube increases,the tensile strength of the brass tube increases in wave shape and the elongation increases first and then sharply decreases.

关键词： brass tube cyclic rotating−bending process severe plastic deformation microstructure mechanical properties

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Degradation of differently processed Mg-based implants leads to distinct foreign body reactions(FBRs)through dissimilar signaling pathways

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Journal of Magnesium and Alloys 2023年第6期11卷 2106-2124页

作者： Xiaosong Liu Guoqiang Chen Xiongxiong Zhong Tianfang Wang Xiaohong He Weipeng Yuan Pingping Zhang Ying Liu Dongming Cao Shu Chen Ken-ichi Manabe Zhengyi Jiang tsuyoshi furushima Damon Kent Yang Chen Guoying Ni Mingyong Gao Hejie Li Cancer Research Institute First People’s Hospital of FoshanFoshanGuangdong 528000China Department of Rheumatology First People’s Hospital of FoshanFoshanGuangdong 528000China The Second Clinical Medical College of Jinan University Shenzhen People’s HospitalShenzhenGuangdong 510632China Genecology Research Centre University of the Sunshine CoastMaroochydore BCQLD 4558Australia Department of Medical Imaging First People’s Hospital of FoshanFoshanGuangdong 528000China Department of Surgery First People’s Hospital of FoshanFoshanGuangdong 528000China Department of Mechanical Engineering Graduate School of Science and EngineeringTokyo Metropolitan University1-1 Minami-osawaHachiojiTokyo 192-0397Japan School of Mechanical MaterialsMechatronic and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongNorthfields AveWollongong NSW 2522Australia Institute of Industrial Science Department of Mechanical and Biofunctional Systemsthe University of Tokyo4-6-1KomabaMeguroTokyo 153-8505Japan School of Science Technology and EngineeringUniversity of the Sunshine CoastMaroochydore BCQLD 4558Australia

Mg alloys have mechanical properties compatible with human ***,their rapid degradation and associated foreign body reactions in vivo significantly limit their application for human *** this study,three differently processed Mg alloys,pure Mg(PM),cold extruded Mg alloy AZ31(CE AZ31),and fully annealed AZ31 Mg alloy(FA AZ31)were comparatively investigated for their potential as implants using a rat *** three implanted Mg alloys do not show any impact on hepato-and renal function,nor any signs of observable changes to vital *** analysis of tissues directly contacting the implants 2.5 months post implantation revealed that FA AZ31 activates very few inflammation and immune associated signaling pathways;while the CE AZ31 and PM produce more significant inflammatory responses as confirmed by cytokine array ***,FA AZ31 activated pathways for cell organization and development that may improve the recovery of injured ***,EBSD analysis reveals that the FA AZ31 alloy has a higher ratio of first-order pyramidal orientated(10–11){10–1–2}grain texture with a value of 0.25,while PM and CE AZ31 alloys have lower ratios of first-order pyramidal orientated texture with the values of 0.16 and 0.17,*** is associated with recovery and recrystallisation during annealing which promotes grain texture which exhibits enhanced degradation behaviours and induces a more limited immune response in *** conclusion,the FA AZ31 demonstrated better biocompatibility and corrosion resistance and is a promising candidate for metal-based degradable implants which warrants further investigation.

关键词： Toxicity test Proteomics analysis Signaling pathway Biocompatibility and corrosion resistance First-order pyramidal slip system Recovery and recrystallization Foreign body reactions(FBRs)

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电加热辅助微弯曲成形中纯钛箔材变形行为的晶粒尺寸效应

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塑性工程学报 2022年第2期29卷 90-94页

作者：郑秋清水徹英古岛刚杨明南京航空航天大学机电学院江苏南京210016 东京都立大学系统设计学院日本东京都日野市191-0065 东京大学生产技术研究所日本东京都目黑区153-8505

研究了晶粒尺寸对纯钛箔材在电加热辅助微弯曲成形中变形行为的影响,为成形过程的设计提供了研究基础。对厚度为50μm的不同晶粒尺寸(2.7、4.5、14.7和24.5μm)的纯钛箔材分别在25、160、300和450℃温度下进行了电加热辅助微弯曲试验,... 详细信息

研究了晶粒尺寸对纯钛箔材在电加热辅助微弯曲成形中变形行为的影响,为成形过程的设计提供了研究基础。对厚度为50μm的不同晶粒尺寸(2.7、4.5、14.7和24.5μm)的纯钛箔材分别在25、160、300和450℃温度下进行了电加热辅助微弯曲试验,对比了不同晶粒尺寸在不同成形温度下对回弹角和弯曲载荷的影响,并分析了其原因。结果表明,在各弯曲温度下,回弹角和弯曲载荷均随晶粒尺寸的增大而减小。此外,高温弯曲相对于室温弯曲的回弹角减小率随晶粒尺寸的增大而增大,高温弯曲时最大弯曲载荷的减小率也随晶粒尺寸的增大而增大。这是由高温弯曲时应变梯度的减小所引起的,并且由于大晶粒箔材的晶界比小晶粒箔材的晶界少,使大晶粒箔材在高温成形时变形更均匀,因而应变梯度的减小量比小晶粒箔材大。

关键词：电加热辅助微弯曲纯钛箔材晶粒尺寸效应回弹角弯曲载荷应变梯度

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