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A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

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Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1191-1200页

作者： He huang huan Liu Li-Sha Wang Yu-hua Li Solomon-Oshioke Agbedor jing Bai Feng Xue jing-hua jiang College of Mechanics and Materials Hohai UniversityNanjing 210000China Ocean and Coastal Engineering Research Institute Nantong 226300China College of Materials Science and Engineering Southeast UniversityNanjing 211189China Suqian Research Institute of Hohai University Suqian 223800China

In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn–1.6 Mg(wt%) alloy during multipass rotary die equal channel angle pressing(RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg2 Zn11 + MgZn2 ternary eutectic structure was formed in as-cast Zn–Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization(DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8 p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn–Mg alloy was successfully developed without sacrifice of the corrosion resistance.

关键词： Zn–Mg alloy Equal channel angular pressing Eutectic structure Mechanical property Corrosion behavior

Microstructure and mechanical property of Mg-10Gd-2Y-1.5Zn-0.5Zr alloy processed by eight-pass equal-channel angular pressing

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Rare Metals 2023年第4期42卷 1371-1377页

作者： huan Liu Jia Ju Xiao-Wei Yang Yu-hua Li jing-hua jiang Ai-Bin Ma College of Mechanics and Materials Hohai UniversityNanjing211100China Suqian Research Institute of Hohai University Suqian223800China College of Materials Engineering Nanjing Institute of TechnologyNanjing211167China

In this work,a high-strength Mg-10Gd-2Y-1.5Zn-0.5Zr(wt%)alloy was prepared via eight passes of equal-channel angular pressing(ECAP).The microstructures and mechanical properties of as-cast and ECAP alloys were systematically investigated by X-ray diffraction(XRD),optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electronic universal testing *** obtained results indicate that the microstructure of as-cast alloy consists ofα-Mg dendrite,network Mg3(Gd,Y,Zn)phase and lamellar 14H long-period stacking ordered(LPSO)phase which is precipitated near the boundary of Mg3(Gd,Y,Zn)*** eight-pass ECAP,the network Mg3(Gd,Y,Zn)phase is deformed and ***,the refined Mg_3(Gd,Y,Zn)particles are not distributed uniformly in the matrix,but still aggregated at the interdendritic ***,the content of 14H lamellas increases obviously,and they become bent and kinked during severe *** is activated in the region between Mg3(Gd,Y,Zn)particles and 14H *** test at room temperature indicates that the ECAP alloy exhibits excellent mechanical property with compressive strength of 518 MPa and fracture strain of 21.6%.The comprehensive high strength and toughness could be ascribed to the refined Mg_3(Gd,Y,Zn)particles,DRX grains and kinked 14H LPSO phase.

关键词： Mg-Gd-Y-Zn-Zr Long-period stacking ordered phase Equal-channel angular pressing Compression strength Fracture strain

Fabrication of AI foam without thickening process through melt-foaming method

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Journal of Iron and Steel Research International 2018年第1期25卷 90-98页

作者： Dong-hui Yang Jian-qing Chen Lei Wang jing-hua jiang Ai-bin Ma College of Mechanics and Materials Hohai UniversityNanjing 210098 Jiangsu China Suqian Research Institute of Hohai University Suqian 223814 Jiangsu China

By using calcium carbonate （CaCO3） powder as the blowing agent, Al foams with porosities of - 60 to 85% and pore size of - 1.5 mm were fabricated via melt-foaming method. Instead of adding a thickening agent to increase Al melt viscosity, a small amount of Mg ingot （5.0 wt%） was added first, and then A1 melt was foamed by adding calcium carbonate via the impellor stirring. The effect of Mg addition on the gas release behavior of calcium carbonate in the Al melt was investigated. The compression behavior of fabricated Al foams was examined. The results show that the blowing gas is possibly from the reaction between Mg and calcium carbonate, and this reaction can produce solid oxides with micrometer level size, which leads to increasing the Al melt viscosity and is beneficial for inhibiting pores coarsening. Besides, the micrometer level cracks in the cell walls make the strength of Al foam decrease.

关键词： Al foam Thickening agent Calcium carbonate Blowing gas Compression

Microstructure Characteristic and Electrochemical Corrosion Behavior of Surface Nano-crystallization Modified Carbon Steel

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Journal of Iron and Steel Research International 2016年第12期23卷 1281-1289页

作者： Zhao-jun CHENG Dan SONG Jin-yang jiang jing-hua jiang Xiao-long MA Kai YOU Ai-bin MA College of Mechanics and Materials Hohai UniversityNanjing 210098JiangsuChina School of Materials Science and Engineering Southeast UniversityNanjing 211100JiangsuChina Suqian Research Institute of Hohai University Suqian 223800JiangsuChina Department of Material Science and Engineering North Carolina State UniversityRaleigh 27606US

The surface nano-crystallization （SNC） of carbon steel was achieved via a high-speed rotating wire-brush- ing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface exhibited marked deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed gradient lay er with thickness of 40-50 μm was produced, and the grain size of the topmost zone was about 50-100 nm. X-ray photoelectron spectroscopy （XPS） analysis indicated that enhanced Fe oxides and Cr oxides were generated. Electrochemical corrosion tests, including open circuit potential （OCP）, electrochemical impendence spectroscopy （EIS）, potentiodynamic polarization （PDP） and potentiostatic polarization （PP） were conducted to study the corrosion be- havior of SNC steel in 3.5 mass% NaC1 solution, where an improved corrosion resistance was observed. The resulted improvement resulted from the dominated positive effects （the attached Cr alloying element and enhanced oxide film） against the negative effects （the higher roughness and the improved corrosion activity of surface microstructure）.

关键词： surface nano-crystallization carbon steel microstructure electrochemical corrosion behavior

Torin2 overcomes sorafenib resistance via suppressing mTORC2-AKT-BAD pathway in hepatocellular carcinoma cells

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Hepatobiliary & Pancreatic Diseases International 2020年第6期19卷 547-554页

作者： Yi-Ting Hu Zhe-Yue Shu jing-hua jiang Qin-Fen Xie Shu-Sen Zheng Department of Hepatobiliary and Pancreatic Surgery Shulan(Hangzhou)HospitalZhejiang Shuren UniversityShulan International Medical CollegeHangzhou 310022China Division of Hepatobiliary Pancreatic Surgery First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Hepatobiliary and Pancreatic Surgery Jinhua Municipal Central HospitalJinhua 321000China

Background:Sorafenib is an oral multi-kinase inhibitor that was approved by the US Food and Drug Administration for the treatment of patients with advanced hepatocellular carcinoma(HCC).However,resistance to sorafenib is an urgent problem to be resolved to improve the therapeutic efficacy of *** the activation of AKT/mTOR played a pivotal role in sorafenib resistance,we evaluated the effect of a dual mTOR complex 1/2 inhibitor Torin2 on overcoming the sorafenib resistance in HCC ***:The sorafenib-resistant Huh7 and Hep3B cell lines were established from their parental cell *** synergistic effect of sorafenib and Torin2 on these cells was measured by cell viability assay and quantified using the Chou-Talalay *** induced by the combination of sorafenib and Torin2 and the alteration in the specific signaling pathways of interest were detected by Western ***:Sorafenib treatment inversely inhibited AKT in parental but activated AKT in sorafenib-resistant Huh7 and Hep3B HCC cells,which underscores the significance of AKT ***2 and sorafenib synergistically suppressed the viability of sorafenib-resistant cells via apoptosis ***2 successfully suppressed the sorafenib-activated mTORC2-AKT axis,leading to the dephosphorylation of Ser136 in BAD protein,and increased the expression of total BAD,which contributed to the apoptosis in sorafenibresistant HCC ***:In this study,Torin2 and sorafenib showed synergistic cytostatic capacity in sorafenibresistant HCC cells,via the suppression of mTORC2-AKT-BAD *** results suggest a novel strategy of drug combination for overcoming sorafenib resistance in HCC.

关键词： Torin2 Sorafenib resistance Hepatocellular carcinoma mTORC2-AKT-BAD pathway

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

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Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1180-1190页

作者： Li-Sha Wang jing-hua jiang Bassiouny Saleh Qiu-Yuan XieQiong Xu huan Liu Ai-Bin Ma College of Mechanics and Materials Hohai UniversityNanjing 210098China Suqian Institute Hohai UniversitySuqian 223800China Production Engineering Department Alexandria UniversityAlexandria 21544Egypt

Mg-RE(rear earth) alloys with long period stacking(LPSO) structures have great potential in biomedical applications. The present work focused on the microstructure and corrosion behaviors of Mg 98.5 Y1 Zn0.5 alloys with 18 R LPSO structure after equal channel angular pressing(ECAP). The results showed that the ECAP process changed the grain size and the distribution of LPSO particles thus controlled the total corrosion rates of Mg 98.5 Y1 Zn0.5 alloys. During the ECAP process from 0 p to 12 p, the grain size reduced from 160–180 μm(as-cast) to 6–8 μm(12 p). The LPSO structures became kinked(4 p), then started to be broken into smaller pieces(8 p), and at last comminuted to fine particles and redistributed uniformly inside the matrix(12 p). The improvement in the corrosion resistance for ECAP samples was obtained from 0 p to 8 p, with the corrosion rate reduced from 3.24 mm/year(0 p) to 2.35 mm/year(8 p) in simulated body fluid, and the 12 p ECAP alloy exhibited the highest corrosion rate of 4.54 mm/year.

关键词： Corrosion behavior Long period stacking ordered phase Magnesium alloys Equal channel angular pressing(ECAP)process Biomaterials

Recent progress in porous Mg-based foam preparation approaches:effect of processing parameters on structure and mechanical property

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Journal of Iron and Steel Research International 2022年第3期29卷 371-402页

作者： Solomon-Oshioke Agbedor Dong-hui Yang jing Cao Jian-qing Chen Bassiouny Saleh Chao Qiu Lei Wang jing-hua jiang Ai-bin Ma College of Mechanics and Materials Hohai UniversityNanjing211100JiangsuChina Suqian Research Institute of Hohai University Suqian223814JiangsuChina Ocean and Offshore Engineering Research Institute of Hohai University Nantong226019JiangsuChina

Porous metals are a class of cellular materials with lightweight and unique mechanical,electrical,thermal,physical and acoustic *** and magnesium alloy foams have exhibited excellent *** particular,open-cell Mg-based foams(porous Mg/Mg alloy foams)have been used for bioresorbable implants,CO_(2)trapping systems,filters,heat exchangers,absorbent panels and many other *** significant progress has been taken in producing porous Mg-based foams with good structure-property relations,but with a large number of different processing parameters,different mechanical properties and pore morphologies of each porous Mg-based foam,it is essential to understand the individual effects of each aspect of the ***,the present article summarized the effects of available processing parameters on the structure and mechanical properties of the porous Mg-based ***,the future perspectives to enhance the structure and properties of porous Mg/Mg alloy foams were discussed.

关键词： Porous Mg alloy Powder processing Sintering Liquid metal infiltration Mechanical property

Improvement of pitting corrosion resistance for Al-Cu alloy in sodium chloride solution through equal-channel angular pressing

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Progress in Natural Science:Materials International 2011年第4期21卷 307-313页

作者： Dan SONG,Ai-bin MA,jing-hua jiang,Ping-hua LIN,Liu-yan ZHANG College of Mechanics and Materials,Hohai University,Nanjing 210098,China College of Mechanics and Materials Hohai University Nanjing 210098 China

Significant corrosion resistance improvement was achieved in solid-solution treated(T4) Al-Cu alloy after severe grain refinement through equal-channel angular *** bulk ultrafine-grained Al-Cu alloy with grain sizes of 200-300 nm has higher pitting potential(elevated by about 34 mV,SCE) and lower corrosion current density(decreased by about 3.88μA/cm~2) in polarization tests than the as-T4 alloy,and increased polarization resistance(increased by about 5.7 kΩ·cm~2) in electrochemical impendence spectrum tests,along with alleviated corrosion damage in immersion *** factors responds to the improved corrosion resistance of the alloy:the first is the refinement of residualθ-phase(Al2Cu) particles leading to the lower micro-galvanic currents and reduced susceptibilities to pitting corrosion,the second is the mass of strain-induced crystalline defects providing more nucleation sites for the formation of more volume fractions of stable oxide film.

关键词： Al-Cu alloy equal-channel angular pressing pitting corrosion resistance ultrafine-grained particle

Synergistic catalysis of the N-hydroxyphthalimide on flower-like bimetallic metal-organic frameworks for boosting oxidative desulfurization

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Petroleum Science 2024年第1期21卷 674-682页

作者： jing He Kun Zhu Wei jiang Dong-Ao Zhu Lin-hua Zhu Hai-Yan huang Wen-Shuai Zhu hua-Ming Li Institute for Energy Research Jiangsu UniversityZhenjiang212013JiangsuChina College of Chemistry and Chemical Engineering Hainan Normal UniversityKey Laboratory of Water Pollution Treatment and Resource Reuse of Hainan ProvinceHaikou571158HainanChina

Synergic catalytic effect between active sites and supports greatly determines the catalytic activity for the aerobic oxidative desulfurization of fuel *** this work,Ni-doped Co-based bimetallic metal-organic framework(CoNi-MOF)is fabricated to disperse N-hydroxyphthalimide(NHPI),in which the whole catalyst provides plentiful synergic catalytic effect to improve the performance of oxidative desulfurization(ODS).As a bimetallic MOF,the second metal Ni doping results in the flower-like morphology and the modification of electronic properties,which ensure the exposure of NHPI and strengthen the synergistic effect of the overall *** with the monometallic Co-MOF and naked NHPI,the NHPI@CoNi-MOF triggers the efficient activation of molecular oxygen and improves the ODS performance without an *** sulfur removal of dibenzothiophene-based model oil reaches 96.4%over the NHPI@CoNi-MOF catalyst in 8 h of ***,the catalytic product of this aerobic ODS reaction is sulfone,which is adsorbed on the catalyst surface due to the difference in *** work provides new insight and strategy for the design of a strong synergic catalytic effect between NHPI and bimetallic supports toward high-activity aerobic ODS materials.

关键词： Metal-organic frameworks Doped Bimetallic N-hydroxyphthalimide Aerobic processes Oxidative desulfurization