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Degradation behavior of austenite, ferrite, and martensite present in biodegradable fe-based alloys in three protein-rich pseudo-physiological solutions

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Bioactive Materials 2024年第11期41卷 96-107页

作者： Abdelhakim Cherqaoui Quang Nguyen Cao Maria Laura Gatto Carlo Paternoster Paolo Mengucci Diego Mantovani Laboratory for Biomaterials and Bioengineering Canada Research Chair I in Biomaterials and Bioengineering for the Innovation in SurgeryDepartment of Min-Met-Materials EngineeringResearch Center of CHU de QuebecDivision of Regenerative MedicineLaval UniversityQuebec CityCanada Department DIISM UniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131AnconaItaly Department SIMAU&UdR INSTM UniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131AnconaItaly

This study investigates the degradation behavior of three distinct fe-based alloys immersed in three pseudo-physiological *** alloys,which have varied Mn and C contents,include a commercially available fe-0.15C alloy,namely fe–C,and two newly developed alloys,that is fe–5Mn-0.2C(namely fe–5Mn)and fe–18Mn-0.6C(namely fe–18Mn).The aim was to understand the effect of alloying elements and the testing solution on the in-vitro degradation behavior of these fe-based *** immersion degradation and potentiodynamic corrosion tests were carried out using three pseudo-physiological solutions with albumin supply,that is modified Hanks’saline solution(MHSS),phosphate buffered saline solution(PBS),and sodium chloride solution(NaCl).After two weeks of static immersion,the results revealed that fe–5Mn,characterized by a mixture of ferrite and martensite,showed the highest degradation rate,while fe–C,composed solely of ferrite,showed the lowest rate of *** predominant degradation products in MHSS and PBS were phosphates and *** PBS,these products formed a remarkably stable protective layer on the surface,contributing to the lowest degradation *** contrast,porous hydroxides appeared as the main degradation products for samples immersed in NaCl solution,leading to the highest degradation *** results provided important insights into the customization of fe–Mn–C alloys for a range of biomedical applications,meeting a variety of clinical requirements,and highlighting the considerable potential of fe–Mn–C alloys for biomedical applications.

关键词： Biodegradable metals fe-based alloys Degradation Albumin Pseudo-physiological solutions

Formation and mechanical properties of ductile fe-based amorphous alloys using a cast iron with minor addition of B and Al

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International Journal of Minerals,Metallurgy and Materials 2007年第S1期15卷 46-49页

作者： Kun Tian, Shujie Pang, Hua Men, and Tao Zhang Department of Materials Science and Engineering, Beihang University, Beijing 100083, China

fe-based amorphous alloys with ductility were synthesized using the commercial cast iron QT50 (denoted as QT) with the combining minor addition of B and Al by single roller melt-spinning. The melt-spun (QT1-xBx)99Al1 (x is from 0.006wt% to 0.01wt%) amorphous alloys exhibit onset crystallization temperatures and Curie temperatures of 759-780 and 629-642 K respectively, and whi- ch increase with B content. The amorphous ribbons are ductile and can be bent 180° without breaking. With the increase in B content from 0.006wt% to 0.01wt%, the Vickers microhardness of the amorphous alloys increases from Hv 830 to Hv 1110. The effects of the additional B and Al elements on the glass forming ability and mechanical properties were also discussed.

关键词： amorphous alloy fe-based alloys cast iron rapid solidification mechanical property

Effects of annealing condition and Al content on novel fe_(73.5)Si_(13.5)B_9Cu_1Nb_(3-x)Al_x alloys

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Rare Metals 2008年第5期27卷 545-549页

作者： LIU Haishun DU Youwei MIAO Xiexing HAN Kui SHEN Xiaopeng BU Wankui School of Sciences China University of Mining ＆ Technology Xuzhou 221008 China National Key Laboratory of Solid State Microstructure Nanjing University Nanjing 210093 China

The annealing condition, AI content, and field amplitude dependences of the complex permeability for Nb-poor Finemet type alloys, fe73.5Si13.5B9Cu1Nba-xAlx （x = 0, 0.5, 1.5, 2.0, and 3.0）, were investigated using an impedance analyzer and X-ray diffraction. The results show that different AI contents lead to different optimum annealing conditions, and the A1 content exerts a distinct effect on microstructure thus resulting in a variety of real permeability value. For the samples annealed at 793 K for 0.5 h, the real permeability increases with an increase in A1 content when the AI content is below 2.0 at.%; as for those annealed at 793 K for 1 h and at 813 K for 0.5 h, an overall increase in real permeability can be obtained compared to those annealed at 793 K for 0.5 h. The permeability under different field amplitudes is also studied and it is found that the relaxation frequency in the lower frequency region tends to moving toward a higher frequency with an increase in field amplitude. All these might be because of the role of Nb in the annealing process and the solubility of AI in the amorphous matrix and nanocrystallized crystallites.

关键词： magnetism magnetic property impedance analysis fe-based alloys

Process-structure-property relationship for plasma-sprayed iron-based amorphous/crystalline composite coatings

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 144-152页

作者： Abhishek Pathak Biswajyoti Mukherjee Krishna Kant Pandey Aminul Islam Pavan Bijalwan Monojit Dutta Atanu Banerjee Anup Kumar Keshri Research and Development Unit Tata SteelJamshedpur 831001India Plasma Spray Coating Laboratory Metallurgical and Materials EngineeringIndian Institute of Technology PatnaBihta 801106India

This study explores the fabrication of fe-based amorphous/crystalline coating by air plasma spraying and its dependency on the coating parameters(plasma power,primary gas flow rate,powder feed rate,and stand-off distance).X-ray diffraction of the coatings deposited at optimized spray parameters showed the presence of amorphous/crystalline *** deposited at a lower plasma power and highest gas flow rate exhibited better density,hardness,and wear *** coatings demonstrated equally good resistance against the corrosive environment(3.5wt%NaCl solution).Mechanical,wear,and tribological studies indicated that a single process parameter optimization cannot provide good coating performance;instead,all process parameters have a unique role in defining better properties for the coating by con-trolling the in-flight particle temperature and velocity profile,followed by the cooling pattern of molten droplet before impingement on the substrate.

关键词： fe-based alloys amorphous alloys plasma spray coating mechanical corrosion and wear

Corrosion Behavior of Plasma Transferred Arc fe-based Coating Reinforced by Spherical Tungsten Carbide in Hydrochloric Acid Solutions

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 299-309页

作者： DONG Yaohua FAN Li CHEN Haiyan DONG Lihua YIN Yansheng SUN Fanghong College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China College of Mechanical and Elec-tronic Engineering Shanghai Jian Qiao UniversityShanghai 201306China School of Mechanical Engineering Shanghai Jiaotong Uni-versityShanghai 200240China

fe-based coatings reinforced by spherical tungsten carbide were deposited on 304 stainless steel using plasma transferred arc(PTA) *** composition and phase microstructure of the coatings were evaluated using scanning electron microscopy(SEM),energy dispersive spectrometer(EDS) and X-ray diffraction(XRD).The corrosion behaviors of the coatings in 0.5 mol/L HCl solution were studied using polarization curve and electrochemical impedance spectroscopy(EIS) *** experimental results shows that the tungsten carbide improves the corrosion resistance of the fe-based alloy coating,but increase in the mass fraction of tungsten carbide leads to increasing amount of defects of holes and cracks,which results in an adverse effect on the corrosion *** defects are mainly present on the tungsten carbide but also extend to the fe-based *** tungsten carbide,acting as a cathode,and binding material of fe-based alloy,acting as an anode,create a galvanic corrosion *** binding material is preferentially corroded and causes the degradation of the coating.

关键词： plasma transferred arc(PTA) spherical tungsten carbide fe-based alloys corrosion resistance electrochemical impedance spectroscopy

Effect of casting vacuum on thermodynamic and corrosion properties of fe-based glassy alloy

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Transactions of Nonferrous Metals Society of China 2015年第3期25卷 844-849页

作者：孙益民王永刚张集滕李瑞郭玲玉徐慧王伟民山东大学材料液固结构演变与加工教育部重点实验室济南250061

The effect of casting vacuum on thermodynamic and corrosion properties of fe61Co7Zr8Mo5W2B17 in shape of cylinder of 3 mm in diameter and ribbon of 20?40μm in thickness and 2?3 mm in width were investigated with X-ray diffraction (XRD), differential scanning calorimetry (DSC), dilatometer (DIL), scanning electron microscopy (SEM) and electrochemical station. It is found that high casting vacuum can improve the glass forming ability (GFA), the contraction degree during heating, and the pitting resistance of the glassy alloy, which can be ascribed to the fact that the dissolution of tungsten in the melt is improved under the high casting vacuum.

关键词： fe-based alloys casting vacuum dilation corrosion resistance