Materials Science and Technology最新文献

{"title":"Solvo/hydrothermal upcycling of polyethylene plastic-waste into carbon-based nanocomposite for supercapacitor application","authors":"M. Kigozi, E. Tebandeke, John Baptist Kirabira, G. Kasozi","doi":"10.1080/02670836.2023.2215646","DOIUrl":"https://doi.org/10.1080/02670836.2023.2215646","url":null,"abstract":"One of the most worrying environmental issues affecting all forms of life, the economy, and natural ecosystems globally is the accumulation of polyethylene (PE) plastic garbage. Creating peaceful and environmentally friendly alternatives to conventional disposal techniques, like transforming plastic waste into cherished carbonaceous nanomaterials, is of utmost importance considering this threat. The current study carefully employed a cleaner upcycling technique to create carbon-based nanomaterials (CNMs) for supercapacitors. Using solvothermal/hydrothermal synthetic techniques, the PE waste was transformed into CNMs used in energy storage supercapacitors application. With an energy density of 21.6 W h kg−1 and a current density of 0.25 A g−1, the electrochemical test showed a specific capacitance of 155.5 F g−1. Additionally, the materials demonstrated 98.5% capacitance retention after 9000 cycles at a constant current density of 1.0 A g−1. Abbreviations: AC: activated carbon; CNM: carbon nanomaterials; CV: cyclic voltammetry; EC: electrochemical system; EDLC: electrical double layer capacitor; EIS: electrochemical impedance spectroscopy; FESEM: field emission scanning electron microscopy; FTIR: Fourier transform infrared; GCD: galvanostatic charge–discharge; HDPE: high-density polyethene; KOH: potassium hydroxide; LLDPE: linear low-density polyethene; Mn: manganese; PE: polyethene; Rct: charge transfer resistance; SSA: specific surface area; TEM: transmission electron microscopy; TGA: thermogravimetric analysis; UV–VIS: ultraviolet–visible spectroscopy; XRD: X-ray diffraction Highlights The article explored a low-temperature and non-emission upcycling method of polyethylene plastic waste into carbon-based nanomaterials (CNMs). CNMs were characterised for physical–chemical properties using different characterisation techniques. The carbon material was used with other materials like activated carbon and manganese to produce nanocomposites tested for electrical double layer capacitor energy storage and exhibited higher energy density.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"14 1","pages":"2707 - 2721"},"PeriodicalIF":1.8,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80143606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of PMMT on microstructure and macrosegregation of large-sized 6061 alloy billet","authors":"Xinyu Bao, Yong-lin Ma, Ruiyin Huang, Yongzhen Liu, Yuanlu Tang, Shuqing Xing","doi":"10.1080/02670836.2023.2215645","DOIUrl":"https://doi.org/10.1080/02670836.2023.2215645","url":null,"abstract":"The pulsed magnetic field melt treatment (PMMT) was applied in the direct chill (DC) casting of 6061 alloy billets with a diameter of 430 mm. The results indicated that the billet solidification structure was refined and homogenised. The grain size was reduced by 20.4% in the billet centre. Meanwhile, the PMMT can reduce the addition of grain refiner. The negative macrosegregation in the billet centre was reduced significantly. This can be attributed to the melt structure being changed by the energy of the pulsed magnetic field, which leads to the temperature of the melt variation and increased nucleation rate. This study may offer a promising method for the high-quality large-sized 6061 alloy billets preparation with less grain refiner.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"32 1","pages":"2699 - 2706"},"PeriodicalIF":1.8,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86332800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution of aluminium in dissimilar A1050/S45C FSW joints by Zn interlayer","authors":"Mohamed Saleh, Y. Morisada, K. Ushioda, H. Fujii","doi":"10.1080/02670836.2023.2216547","DOIUrl":"https://doi.org/10.1080/02670836.2023.2216547","url":null,"abstract":"This study investigated the microstructural evolution of A1050 stir zones in dissimilar A1050/S45C friction stir-welded joints fabricated with 100- and 200-µm-thick Zn interlayers in addition to a third joint without any interlayer. The dissolved Zn in the A1050 stir zones contributed to its strengthening by forming Al–Zn solid solution. The addition of Zn refined the A1050 grains with many well-defined high-angle grain boundaries. The effect of Zn in the A1050 strengthening and grain refinement becomes apparent with a relatively high content of Zn. The possible precipitation of Zn-rich particles along the A1050 grain boundaries may also contribute to the A1050 stir zone strengthening by retarding the dislocation motion and enhancing the discontinuous dynamic recrystallisation.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"13 1","pages":"2722 - 2729"},"PeriodicalIF":1.8,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81204050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Refinement behaviour of microstructure in in-situ synthesised (TiB+TiC)/Ti6Al4V composites by laser melting deposition","authors":"H. Gu, Jie Zhang, Jianhua Sun, Guoqing Wu, Zhong-gang Sun","doi":"10.1080/02670836.2023.2213023","DOIUrl":"https://doi.org/10.1080/02670836.2023.2213023","url":null,"abstract":"Laser melting deposition (LMD) was used to stimulate the columnar to equiaxed transition (CET) of Ti6Al4V grains by adding a few of nano-B4C particles. The results showed that the grains were gradually refined with the increase of B4C content. When the B4C content is 3 wt-%, the titanium matrix composite material of B4C and Ti6Al4V reached CET. Ti6Al4V and B4C happened in-situ reaction to form TiB and TiC reinforcements at high temperature, which not only precipitate at grain boundaries to limit grain growth but also act as nucleation to accelerate the non-spontaneous nucleation of β grains to achieve fine grain strengthening. It reveals the epitaxial growth mechanism of β grains at the deposition bottom, the transition pattern and CET mechanism of the interface structure in successive deposition layers.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"29 1 1","pages":"2662 - 2669"},"PeriodicalIF":1.8,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90066685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvements in welding continuous cooling transformation diagram of high-strength low-alloy steel weld","authors":"Zi-Yi Lai, X. Lei, Zhenmin Zhang, Yu Zhang, Chaobin Lai","doi":"10.1080/02670836.2023.2215644","DOIUrl":"https://doi.org/10.1080/02670836.2023.2215644","url":null,"abstract":"The welding continuous cooling transformation (CCT) diagram concerning microstructure evolution in a fine zone of the weld joint provides essential data for microstructure control in practice. In this study, a welding CCT diagram was improved to be elaborate by using the expanded lever rule. Processes for obtaining pieces of phase information are explained in detail. Improvements are: (i) phase areas are clearly presented, (ii) phase volume percentages are given, and (iii) overlapped phase areas are revealed. To meet high-strength requirement, a heat input of 21 kJ cm−1 was referenced from the welding CCT diagram, for achieving acicular ferrite and lath-like martensite. Transformed phase volume fractions are estimated and high strength and good toughness are obtained due to the elaborate phase information. GRAPHICAL ABSTRACT","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"1 1","pages":"2690 - 2698"},"PeriodicalIF":1.8,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89639914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration analysis of composite plates reinforced CNTs using an exponential function approach","authors":"Mohamed Essedik Lazar, Madjid Ezzraimi, R. Tiberkak, Yasser Chiker, M. Bachene, Saïd Rechak","doi":"10.1080/02670836.2023.2213975","DOIUrl":"https://doi.org/10.1080/02670836.2023.2213975","url":null,"abstract":"Free vibration analysis of functionally graded material ‘FGM’ plates reinforced with carbon nanotubes (CNTs) using exponential distribution law is investigated. Nonlinear distribution through the thickness direction of Nano-fillers is considered in the present study. Thus, the mechanical properties of the nanotubes vary through the thickness and are evaluated using a modified rule of mixture. In the finite element analysis formulation, the first-order shear deformation theory has been implemented by using the exponential law. The obtained results show a better distribution of CNTs through the thickness, which leads to an improved plate stiffness. An increase in the natural frequencies is thus expected. The obtained results show the five natural frequencies which compare well with those available in the literature.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"73 1","pages":"2680 - 2689"},"PeriodicalIF":1.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79595461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and second-phase strengthening mechanisms of CuTeCrY alloy","authors":"Lixun Deng, Liukui Gong, Shixin Song, Yansong Zhang, Hongwei Feng, Ziming Chen, Hefeng Yuan, Wei Huang","doi":"10.1080/02670836.2023.2210912","DOIUrl":"https://doi.org/10.1080/02670836.2023.2210912","url":null,"abstract":"A CuTeCrY alloy prepared by homogenising annealing, hot extrusion, solution treatment, cold drawing, and a heat ageing treatment has tensile strength and electrical conductivity of 430 MPa and 78.9% IACS, respectively. Electron microscopy analyses show that a metastable CrCu2Te phase in the solid solution alloy is eliminated by the ageing treatment, and a 3–5 nm granular bcc-Cr phase becomes distributed in the matrix. This nanometre Cr second phase is the main contributor to the strengthening of the alloy whereas the second-phase strengthening effects of micrometre Cr and Te phases are weak.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"1 1","pages":"2535 - 2543"},"PeriodicalIF":1.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86810689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving microstructure and segregation of steel ingot by inorganic heat absorption method","authors":"Yang Xu, Jiang Wang, S. Shuai, Shenghao Yu, Dan-qing Jiang, Chaoyue Chen, T. Hu, Z. Ren","doi":"10.1080/02670836.2023.2210913","DOIUrl":"https://doi.org/10.1080/02670836.2023.2210913","url":null,"abstract":"A novel method by adding inorganic heat absorption material (IHAM) into the molten steel was proposed to improve the quality of large steel ingots. The IHAM was found to melt and float up after absorbing the heat of molten steel, stirring the melt and thus accelerating the cooling process. The molten steel was also purified as the inclusions were adsorbed during the floating of IHAM. The addition of IHAM rod was conducive to increase the equiaxed grain ratio (EGR) and alleviate the central carbon segregation, while the IHAM cored wire played a more important role in reducing the inclusion index. This method holds broad appeal to solidification of large steel ingot, as it can improve the microstructure of solidified ingot.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"11 1","pages":"2544 - 2555"},"PeriodicalIF":1.8,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75334258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative study of Cd addition effects on precipitation in different aluminium alloys","authors":"F. Qian, Jinyue Li, Dongdong Zhao, Shenbao Jin, E. Mørtsell, Yanjun Li","doi":"10.1080/02670836.2023.2207368","DOIUrl":"https://doi.org/10.1080/02670836.2023.2207368","url":null,"abstract":"This work demonstrates that Cd microadditions can enhance the precipitation of age-hardening precipitates in 2xxx and 6xxx alloys as well as the dispersoid precipitation in 3xxx alloys, but have a minimal effect on the precipitation in 7xxx alloys. Experimental and theoretical methods are utilised to investigate the nucleation and precipitation of precipitates/dispersoids in Cd-containing Al alloys. The enhanced precipitation of θ′ and α-dispersoids in 2xxx and 3xxx alloys, respectively, are proposed to result from the heterogeneous nucleation on earlier-formed Cd-rich nanoparticles, while the enhanced precipitation of β′′ in 6xxx alloys is attributed to the increased number density of effective Mg-Si co-clusters due to the Cd incorporation. This investigation provides theoretical basis for the design of precipitation-strengthened Al alloys via microalloying.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"56 1","pages":"2469 - 2477"},"PeriodicalIF":1.8,"publicationDate":"2023-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74464128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the microstructure, hardness and electrical conductivity properties of Fe/Graphene compacts","authors":"O. Altuntaş, Melika Ozer, Gözde Altuntaş, A. Ozer","doi":"10.1080/02670836.2023.2213554","DOIUrl":"https://doi.org/10.1080/02670836.2023.2213554","url":null,"abstract":"ABSTRACT The effects of graphene nanoplatelets added to pure Fe powders at different rates on microstructure, hardness and electrical conductivity were investigated. Prepared mixed powders were compressed at 700 MPa pressure and sintered at 1250°C. Densities of samples were measured Archimedes technique. Scanning electron microscope was used for microstructure investigations. The hardness was measured according to ASTM E384. Phase types, average crystallite size and dislocation density calculations in sintered samples were made. Electrical resistance measurements were made with the four-point probe measurement technique. Powder mixtures containing ≤5 wt-% graphene nanoplatelets were sintered into compact samples. The smallest grain size, highest dislocation density, highest hardness and electrical conductivity values were obtained in samples containing 2 wt-% of graphene nanoplatelets.","PeriodicalId":18232,"journal":{"name":"Materials Science and Technology","volume":"9 1","pages":"2670 - 2679"},"PeriodicalIF":1.8,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77629787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}