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2022 7th International Seminar on Advances in materials Science and Engineering, ISAMSE 2022

作者： Liu, Yushuang Zhang, Peigen Sun, Zhengming Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and Engineering Nanjing Institute of Technology Jiangsu Nanjing211167 China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Jiangsu Nanjing211189 China

The spontaneous growth of tin whiskers has resisted interpretation for more than 70 years. Herein, tin whisker growth behaviours on Ti2SnC bulks cold-pressed under different pressures were studied. It was found that higher whisker growth propensity is reached when Ti2SnC cold-pressed under higher pressure. Several thicker whiskers with diameter more than 3 μm were observed on the samples formed under higher pressure, while the diameter of more than 50% whiskers ranges from 0.5 μm to 1.5 μm for all of the samples. An atomic motion mechanism, in which the element source supplying Sn whisker growth diffuse through the Sn atom layer in Ti2SnC lattice, and the interaction between Ti2SnC and Sn is considered to be the fundamental factor initiating the Sn whisker growth, was employed to understand the phenomena. The findings herein provide new clues to understand the tin whisker growth behaviors and modulable metal whisker fabrication. © Published under licence by IOP Publishing Ltd.

关键词： Crystal whiskers

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Resin transfer molding process and performance of paraffin based energy storage composites framed on polyurethane foam

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materials Science for Energy Technologies 2022年 5卷 252-261页

作者： Zusheng, Hang Zichun, Lv Yongsheng, Zhang Qing, Zhang Xu, Wang Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167 China School of Materials Science and Engineering Nanjing Institute of Technology Nanjing211167 China School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China

With the continuous exploration and development in the field of energy storage, phase Change Material (PCM) are good energy storage materials. Paraffin wax is a good low-temperature phase change material because of its high enthalpy of phase change, stable chemical properties, no subcooling and low cost. However, it has disadvantages such as easy leakage of phase change and low thermal conductivity in practical applications. In this paper, octadecane with a melting point of 22 °C and 52# paraffin wax with a melting point of 54 °C were used as raw materials, and paraffin wax with a melting point of 35 °C was prepared by blending with a mass ratio of 1: 1.5 (52# paraffin wax: octadecane), and then the blended paraffin wax was compounded with polyurethane frame structure by resin transfer molding (RTM) method, and finally aluminum foil was used to encapsulate the composite phase change material and enhance its thermal conductivity. The properties of the composite phase change material were investigated by DSC (Differential Scanning Calorimeter), FTIR (Fourier Transform infrared spectroscopy), TG (glass transition temperature), and tensile tests. The results show that the tensile strength decreases with the increase of RTM infusion pressure, and the minimum is 6.5 kPa, at which time the elongation at break is 55.2%, and the thermal conductivity of the composite material after aluminum foil encapsulation is 1.83 W/(m·K), and the thermal conductivity is found to be stable after residual analysis. This paper provides a technical reference for the rapid batch preparation of PCM composite system by RTM molding method with polymer material as the frame structure. © 2022

关键词： Phase change materials

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Simultaneously improving mechanical and anti-corrosion properties of extruded Mg-Al dilute alloy via trace Er addition

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Journal of materials Science & technology 2023年第19期150卷 49-64页

作者： Zhi Zhang Jinshu Xie Jinghuai Zhang Hao Dong Shujuan Liu Xiaobo Zhang Jun Wang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China Ningbo Branch Ordnance Science Institute of ChinaNingbo 315103China

Simultaneously improving the mechanical properties and corrosion resistance of magnesium(Mg)alloys is a long-standing challenge to be solved in their engineering *** this work,we find that trace Er addition can improve the mechanical and anti-corrosion properties of Mg-1.4Al-0.4Mn-0.4Ca-0.3Er(wt%,AMXE)dilute alloy synergistically,especially reducing the corrosion rate(0.75 mm y-1)by one order of magnitude compared with the reference Mg-1.4Al-0.4Mn-0.4Ca(AMX)alloy and making it comparable to that of high-purity *** trace Er reduces the dynamic recrystallization degree and increases the strengthening phase particles,which is mainly responsible for the increase of yield strength by 42 *** addition of Er promotes the formation of much less noble Al8Mn4Er with effective Fe trapping ability and induces dislocation segregation,thus dramatically reducing micro-galvanic corrosion ***,Er addition promotes the formation of a more passivation and dense corrosion *** two factors together lead to the extremely low corrosion rate of AMXE *** findings are expected to promote the development of low alloyed high performance Mg alloys.

关键词： Magnesium alloy Mechanics-corrosion synergy Rare earth element SKPFM

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Nucleation potency prediction of LaB_6 with E2EM model and its influence on microstructure and tensile properties of Al-7Si-0.3Mg alloy

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Transactions of Nonferrous Metals Society of China 2018年第9期28卷 1687-1694页

作者： Li-jun JING Ye PAN Tao LU Jin-hong PI Teng-fei GU Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China

The edge-to-edge matching(E2EM)crystallographic model was used to predict the orientation relationships(ORs)between LaB6 and *** different possible ORs can be predicted between LaB6 and Al,which are(100)Al||(100)LaB6,[001]Al||[001]LaB6;(110)Al||(110)LaB6,[001]Al||[001]LaB6;and(111)Al||(111)LaB6,[011]Al||[011]*** prediction results are perfectly confirmed through TEM analysis and prove the nucleation potency of *** refining efficacy of Al-2La-1B refiner and its influence on the tensile properties were investigated in the as-cast Al-7Si-0.3Mg *** to the results,LaB6 has higher nucleation potency than TiB2,leading to better grain refining efficacy of Al-2La-1B refiner in the as-cast Al-7Si-0.3Mg *** the mechanical performances,tensile properties of the as-cast Al-7Si-0.3Mg casting alloy are prominently improved after addition of Al-2La-1B refiner,due to the refined microstructures.

关键词： edge-to-edge matching orientation relationship casting aluminum alloy grain refinement tensile properties

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Correlation between crystal structure and mechanical performance of Cr-implanted 300M high-strength steel using X-ray diffraction method

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Journal of Iron and Steel Research International 2019年第10期26卷 1106-1116页

作者： Xiao-hu Chen Ping-ze Zhang Dong-bo Wei Xiao Huang Feng Ding Feng-kun Li Xian-jun Dai Zhang-zhong Wang College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106JiangsuChina Ningbo Branch China Ordnance AcademyNingbo 315103ZhejiangChina Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167JiangsuChina Key Laboratory of Materials Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211106JiangsuChina Department of Mechanical and Aerospace Engineering Carleton UniversityOttawaON ONK1S5B6Canada

In order to study the influence of crystal structure change due to implantation dose on the hardness and wear performance of 300M high-strength steel,samples were surface modified by Cr implantation with dosages of 5.0 × 10^16,1.5 × 10^17 and 3.0 × 10^17 ions/cm^2.X-ray diffraction method,which was already applied in studies on the microstructure of deformed and heat-treated materials,was used to study the crystal structure of the implanted steel,and the results were corrected with the hardness and wear *** solid solution strengthening effect and microstructure vary with increase in implantation *** to strong solid solution hardening of Cr,small average crystallite size and high dislocation density,the hardness and wear resistance of implanted steel with dose of 5.0 × 10^16 ions/cm^2 were found to be the highest compared with other ***,although the crystal lite size of the implanted sample with dose of 3 × 10^17 ions/cm^2 was similar to that of substrate and the dislocation density was lower than that of the substrate,its higher hardness and lower specific wear rate were due to the solid solution hardening and perhaps Cr clusters reinforcement.

关键词： X-ray diffraction method Ion implantation Dislocation density Hardness Wear Crystal structure

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Refining 18R-LPSO phase into sub-micron range by pre-kinking design and its prominent strengthening effect on Mg_(97)Y_(2)Zn_(1) alloy

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Journal of materials Science & technology 2024年第9期176卷 13-24页

作者： Chao Sun Huan Liu Ziyue Xu Yuna Wu Kai Yan Jia Ju Jinghua Jiang Feng Xue Jing Bai Yunchang Xin College of Mechanics and Materials Hohai UniversityNanjing 210000China College of Materials Science and Engineering Southeast UniversityNanjing 211189China Jiangsu Key Laboratory for Light Metal Alloys Nanjing Yunhai Special Metals Co.Ltd.Nanjing 211200China College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China

In this study,a composite deformation strategy of pre-kinking(equal channel angular pressing(ECAP))followed by large-ratio hot extrusion(HE)was designed to refine the 18R long period stacking ordered(LPSO)phase into sub-micron range in a Mg_(97)Y_(2)Zn_(1)(at.%)*** the composite processing,the mechanical properties of the alloy are significantly enhanced,superior to the majority of reported Mg_(97)Y_(2)Zn_(1) and other LPSO-containing Mg *** the composite deformed alloys,the 16P-HE alloy exhibits the best mechanical properties with tensile yield strength(TYS)of 475 MPa,ultimate tensile strength(UTS)of 526 MPa,and fracture elongation(FE)of 14.5%.Quantitative analysis of 18R phase indicates that increasing ECAP pass from 1 to 16 gradually decreases the average size of 18R phase from 5.1μm to 2.3μ*** HE,the 18R phase is further refined with a corresponding decrease in the average size in the descending order of 1P-HE(4.3μm),4P-HE(3.2μm),and 16P-HE(1.4μm)*** of the strengthening contributions confirms that the superior mechanical properties of 16P-HE alloy are mainly due to its strongest interface strengthening(145 MPa)and grain boundary strengthening(189 MPa)from the sub-micron 18R phase andα-Mg ***,the strengthening effect of 18R phase decreases gradually with their morphology changing from particles to fibers,and to *** obtained results further deepen and broaden the strengthening-toughening theory of 18R phase.

关键词： Magnesium alloys Long period stacking ordered structure Plastic deformation Refinement Mechanical property

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Corrosion behavior of Mg-3Gd-1Zn-0.4Zr alloy with and without stacking faults

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Journal of Magnesium and Alloys 2019年第2期7卷 240-248页

作者： Xiaobo Zhang Jianwei Dai Ruifeng Zhang Zhixin Ba Nick Birbilis Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of TechnologyNanjing 211167China School of Materials Science and Engineering Central South UniversityChangsha 410083China College of Engineering and Computer Science Australian National UniversityActon ACT 2000Australia

To develop biodegradable magnesium alloy with desirable corrosion properties,a low Gd-containing Mg-3Gd-1Zn-0.4Zr(wt%,GZ31K)alloy was *** as-cast ingot was solution treated and then hot *** were characterized by scanning electron microscopy(SEM).Corrosion behavior of the alloy under each condition was studied by hydrogen evolution and quasi in-situ corrosion *** has been found that the as-cast alloy is composed ofα-Mg,stacking faults(SFs)at the outer edge of the matrix grains,and eutectic phase along the grain *** solution treatment,the SFs disappear and precipitates rich in Zn and Zr elements form in the grain interior and *** microstructure is significantly refined after *** evolution tests show that the as-cast alloy exhibits the best corrosion resistance,and the solution-treated alloy has the worst corrosion *** rate of the alloy under each condition decreases first and then increases with prolonging immersion *** experiments demonstrate thatα-Mg was corroded preferentially,the eutectic phase and precipitates exhibit better corrosion *** as-extruded alloy demonstrates uniform corrosion due to fine and homogeneous microstructure.

关键词： Magnesium alloys Stacking faults Corrosion resistance Uniform corrosion

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SYNTHESIS OF pH-RESPONSIVE AMPHIPHILIC DIBLOCK COPOLYMERS CONTAINING POLYISOBUTYLENE via OXYANION-INITIATED POLYMERIZATION AND THEIR MULTIPLE SELF-ASSEMBLY MORPHOLOGIES

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Chinese Journal of Polymer Science 2013年第2期31卷 218-231页

作者： Huai-chao Wang Ming-zu Zhang 倪沛红 Jin-lin He Ying Hao Yi-xian Wu College of Chemistry Chemical Engineering and Materials Science Soochow University Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Soochow University State Key Lab of Chemical Resource Engineering Beijing University of Chemical Technology

Two pH-responsive amphiphilic diblock copolymers, namely polyisobutylene-block-poly[2-（N,N- dimethylamino）ethyl methaerylate] （PIB-b-PDMAEMA） and polyisobutylene-block-poly（metharylic acid）（PIB-b-PMAA）, were synthesized via oxyanion-initiated polymerization, and their multiple self-assembly behaviors have been studied. An exo-01efin-terminated highly reactive polyisobutylene （HRPIB） was first changed to hydroxyl-terminated PIB （PIB-OH） via hydroboration-oxidation of C =C double bond in the chain end, and then reacted with KH to yield a potassium alcoholate of PIB （PIB-O-K＋）. PIB-O-K＋ was immediately used as a macroinitiator to polymerize DMAEMA monomer, resulting in a cationic diblock copolymer PIB-b-PDMAEMA. With the similar synthesis procedure, the anionic diblock copolymer PIB-b- PMAA could be prepared via a combination of oxyanion-initiated polymerization of tert-butyl methacrylate （tBMA） and subsequent hydrolysis of tert-butyl ester groups in PtBMA block. The functional PIB and block copolymers have been fully characterized by 1H-NMR, FT-IR spectroscopy, and gel permeation chromatography （GPC）. These samples allowed us to systematically investigate the effects of block composition on the pH responsivity and various self-assembled morphologies of the copolymers in THF/water mixed solvent. Transmission electron microscopy （TEM） images revealed that these diblock copolymers containing small amount of original PIB without exo-olefin-terminated group are able to self-assemble into micelles, vesicles with different particle sizes and cylindrical aggregates, depending on various factors including block copolymer composition, solvent polarity and pH value.

关键词： Oxyanion-initiated polymerization Polyisobutylene Stimuli responsivity Amphiphilic copolymer Self- assembly.

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Effects of Solution Temperature on Microstructure and Properties of Zn-2Cu-0.8Mg Alloy 10

Effects of Solution Temperature on Microstructure and Proper...

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10th International Conference on Advances in Machinery, Material Science and Engineering application, MMSE 2024

作者： Gu, Shenyi Zhang, Yan Wang, Hongxing Zhang, Xinxiang Zhou, Tao Zhen, Zhihao Li, Yaoyang Zhang, Xize School of Materials Science and Engineering Nanjing Institute of Technology Nanjing211167 China Key Laboratory of Advanced Structural Materials and Application Technology of Jiangsu Province Nanjing211167 China

ISBN: (纸本)9781643685465

Zn-2Cu-0.8Mg zinc alloy was prepared by metal mold casting. The effects of solution temperature on the microstructure, corrosion behavior and mechanical properties of zinc alloy were studied. The results show that the microstructure of zinc alloy is mainly composed of η-Zn, Mg2Zn11 and a small amount of CuZn5 compounds. As the solution temperature increases, η-Zn content increases, the grain size increases, from dendrite to equiaxed crystal to coarsening;The tensile strength and elongation of the solid solution alloy are higher than those of the as cast alloy, and decrease with the increase of solution temperature. The alloy after 320°C solution treatment has the maximum values of mechanical properties, which are 396 MPa and 1.18% respectively, 1.3 and 1.8 times of those of as cast alloy;Fracture analysis shows that the fracture mode of zinc alloy is mainly cleavage fracture. The electrochemical test shows that the corrosion resistance of zinc alloy increases with the increase of solution temperature, and the self-corrosion current density of the alloy after 380°C solution treatment is the lowest, 14.965μ***-2. The corrosion rate is the lowest, 0.022mm/y. © 2024 The Authors.

关键词： Tensile strength

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Microstructure and corrosion behavior of hot compressed AZ31B magnesium alloy joint

Microstructure and corrosion behavior of hot compressed AZ31...

引用

Chinese materials Conference on Special and High Performance structural materials, CMC 2015

作者： Chu, Yajie Han, Xinchen Yang, Zonghui Li, Xiaoquan Department of Material engineering Nanjing institute of technology Nanjing211167 China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167 China

ISBN: (纸本)9783038357612

The extruded AZ31B magnesium alloy plates of 4 mm thickness were butt welded using gas tungsten arc welding (GTA) process. The microstructure and corrosion behavior of the hot compressed welds were evaluated by conducting immersion test in NaCl solution at different immersion time and chloride ion concentrations. The specimens were exposed to immersion in order to characterize their corrosion rates. The corrosion morphology and pit morphology observation was carried out by scanning electron microscopy (SEM). The results showed that the corrosion rate of hot compressed magnesium alloy welds decreased with the increase in immersion time and the corrosion rate increased with the increase in chloride ion concentration, and the corrosion morphology was predominantly influenced by the distribution of β-phase. © 2016 Trans Tech Publications, Switzerland.

关键词： Corrosion rate

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