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作者： Król, Mariusz Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Ul. Konarskiego 18a Gliwice44-100 Poland

The six Mg-Li and Mg-Li-Al alloys in as-cast state namely Mg-4.5%Li, Mg-9%Li, Mg- 12%Li, Mg-4.5%Li-1.5%Al, Mg-9%Li-1.5%Al and Mg-12%Li-1.5%Al were prepared and analysed. These alloys have been subjected to the thermal analysis (thermal derivative-analysis and dilatometry study), and the subsequent thermal assessment, mechanical properties and microstructures were studied. The heating and cooling dilatometric curves characterise by a linear reduction (alloys with 12wt.% of Li) and linear increase (alloys with 4.5wt.% of Li) in coefficient of linear thermal expansion as a function of temperature. No transitions in the solid state occur. Based on results of thermal-derivative analysis a crystallisation process of Mg-Li and Mg-Li-Al alloys was proposed. Addition of aluminium in ultra-light Mg-Li alloys shows considerably improved strengthening without a reduction in grain size. Increasing the lithium content causes the increase of hardness. © 2018 Trans Tech Publications, Switzerland.

关键词： Microstructure

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Laser surface treatment of cast aluminium-silicon alloys

Laser surface treatment of cast aluminium-silicon alloys

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作者： Labisz, K. Tański, T. Department of Railway Transport Faculty of Transport Silesian University of Technology Krasińskiego Str. 8 Katowice40-019 Poland Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Ul. Konarskiego 18a Gliwice44-100 Poland

The reason of performing the investigations carried out in this work was to investigate the microstructure of the laser treated Al-Si-Cu cast aluminium alloy with the ceramic powder particles using High Power Diode Laser (HPDL) for remelting, and/or alloying. First of all the feeding and distribution of the powder in the surface layer of the alloyed and remelted AlSi7Cu material. Very important issue is the determination of the laser treatment parameters, especially the powder feeding rate, laser power, and scan rate to achieve an enhancement of the layer hardness for ensuring this cast aluminium alloy from losing their working properties and to achieve the tool surface is more resistant to wear. The purpose of this work was also to determine technological and technical conditions comparison for the Al2O3 and SiC ceramic powder alloyed into the surface layer with High Power Diode Laser. There are presented also the investigation results about the determination of proper technical condition during the laser treatment, especially the laser head distance and shielding gas influence. The presented results concerns first of all the structure investigation of the obtained surface layer allowing it to achieve an enhanced hardness and wear resistance more resistant for work, special attention was devoted to monitoring of the layer morphology of the investigated material and on the particle occurred. Light (LM) and scanning electron microscopy (SEM) were used to characterize the microstructure of the obtained surface zones - the remelted zone (RZ) and heat affected zone (HAZ), the ceramic powder distribution and intermetallic phases occurred. A wide range of laser power values was applied and implicated with different laser scan rates. The powders in form of ceramic powders used for alloying were chosen with the particle size of ca. 60µm. This study was conducted to investigate the influence carbide and oxide powder addition on structure and mechanical properties as well the

关键词： Surface treatment

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Deep learning enabled fast optical characterization of two-dimensional materials

arXiv

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arXiv 2019年

作者： Han, Bingnan Lin, Yuxuan Yang, Yafang Mao, Nannan Li, Wenyue Wang, Haozhe Fatemi, Valla Zhou, Lin Wang, Joel I-Jan Ma, Qiong Cao, Yuan Rodan-Legrain, Daniel Bie, Ya-Qing Navarro-Moratalla, Efrén Klein, Dahlia MacNeill, David Wu, Sanfeng Leong, Wei Sun Kitadai, Hikari Ling, Xi Jarillo-Herrero, Pablo Palacios, Tomás Yin, Jihao Kong, Jing Image Processing Center School of Astronautics Beihang University Beijing100191 China Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Chemistry Boston University BostonMA02215 United States Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Instituto de Ciencia Molecular Universidad de Valencia c/Catedrático José Beltrán 2 Paterna46980 Spain Division of Materials Science and Engineering Boston University BostonMA02215 United States

Characterization of nanomaterial morphologies with advanced microscopy and/or spectroscopy tools plays an indispensable role in nanoscience and nanotechnology research 1 2, 3, 4, 5, as rich information about the chemical compositions, crystallography, other physical and chemical properties, as well as the growth mechanism can be extracted from morphology analysis. However, the interpretation of imaging data heavily relies on the "intuition" of experienced researchers. As a result, many of the deep graphical features are often unused because of difficulties in processing the data and finding the correlations. Such difficulties can be well addressed by deep learning 6 7, 8, 9. In this work, we use the optical characterization of two-dimensional (2D) materials as a case study, and demonstrate a neural network based algorithm for the material and thickness identification of exfoliated 2D materials with high prediction accuracy and real-time processing capability. Further analysis shows that the trained network can be used to predict physical properties of the materials. Finally, a transfer learning technique is applied to adapt the pretrained network to more optical characterization applications such as identifying layer numbers of chemically synthesized graphene domains. Copyright © 2019, The Authors. All rights reserved.

关键词： Data handling

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Effect of strain deformation rates on forming the structure and mechanical properties of high-manganese austenitic TWIP steels

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Advances in materials and processing Technologies 2016年第4期2卷 490-502页

作者： Dobrzański, Leszek Adam Borek, Wojciech Mazurkiewicz, Janusz Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Gliwice Poland

The aim of this paper is to determine the influence of strain rate on mechanical properties and structure of high-Mn austenitic TWIP steels. Deformation rates in a range from 0.001 to 1000 s ⁻¹ have a significant effect on forming the structure and mechanical properties of high-manganese austenitic TWIP-type steels. TWIP steels not only show excellent strength, but also have excellent formability due to twinning, thereby leading to excellent combination of strength, ductility and formability over conventional dual phase steels or transformation-induced plasticity steels. Also the strain energy per unit volume of advanced high-Mn TWIP steels containing Mn, Al, SI and some of that steels with Nb and Ti microadditions with various structures after their heat- and thermomechanical treatments increases considerably in dynamic conditions. The microstructure of investigated steels was determined in metallographic investigations using light, scanning and high-resolution transmission electron microscopes. Results obtained in static and dynamic conditions for newly developed high-manganese austenitic steels indicate the possibility and purposefulness of their employment for constructional elements of vehicles, especially of the passenger cars to take advantage of the significant growth of their strain energy per unit volume which guarantee reserve of plasticity in the zones of controlled energy absorption during possible collision resulting from the activation of twinning induced by cold working, which may result in significant growth of the passive safety of these vehicles’ passengers. © 2016, © 2016 Informa UK Limited, trading as Taylor & Francis Group.

关键词： High manganese steel mechanical properties strain rate structure TWIP mechanism

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Influence of hot-working conditions on a structure of X11MnSiAl17-1-3 steel for automotive industry

Influence of hot-working conditions on a structure of X11MnS...

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作者： Dobrzański, Leszek Adam Czaja, Malgorzata Borek, Wojciech Labisz, Krzysztof Tański, Tomasz Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego 18A Gliwice44-100 Poland

The investigations are focused on high-manganese austenitic steel used for reinforcing elements of a car body. The main purpose of this paper is to determine the effect of various conditions of thermomechanical treatment carried out on Gleeble 3800 simulator being on equipping Scientific and Didactic Laboratory of Nanotechnology and materials Technologies, Institute of Engineering materials and Biomaterials, Silesian University of technology in Gliwice Poland, and LPS module for semi-industrial hot-rolling on the structure and phase transformations occurring during cold plastic deformations. Thermomechanical treatment consists of a four passovers with a planned true strain equal 4 × 0.23. There were three variants of cooling after thermomechanical treatment: cooling in water, natural air-cooling and cooling in water after isothermal holding for 30 s at the temperature of last deformation 850°C. After thermomechanical treatment of high-manganese austenitic steel performed in the laboratory Gleeble 3800 simulator and industrial conditions of LPS module can be concluded that simulation in laboratory conditions allows to obtain fine-grained austenitic structure. Rolling performed in the semi-industrial conditions in the LPS rolling mill did not allow to achieve the assumed parameters of thermomechanical treatment, such as temperature and planned strain during successive deformations. These factors have led to the lack of a uniform structure fragmentation of the rolled material, and also have an influence on mechanical properties obtained during cold plastic deformation. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： Cooling

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Electron microscopy investigation of cast aluminium alloy after laser feeding with ceramic powder 15th

Electron microscopy investigation of cast aluminium alloy af...

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15th International Conference on Electron Microscopy, EM 2014

作者： Krzysztof, Labisz Tomasz, Tanski Jaroslaw, Konieczny Miroslawa, Pawlyta Ewa, Jonda Silesian University of Technology Institute of Engineering Materials and Biomaterials Division of Biomaterials Engineering Konarskiego 18A Gliwice44-100 Poland Silesian University of Technology Institute of Engineering Materials and Biomaterials Division of Materials Processing Technologies Management and Computer Techniques in Materials Science Konarskiego 18A Gliwice44-100 Poland Silesian University of Technology Institute of Engineering Materials and Biomaterials Division of Metal and Polymer Materials Processing Konarskiego 18A Gliwice44-100 Poland

ISBN: (纸本)9783038354680

This paper presents the results of an investigation using transmission electron microscopy concerning the structure of AlSi7Cu2 cast aluminium alloy after alloying and remelting with a high power diode laser (HPDL). In particular, the changes in the particle/precipitation type, size and shape were determined, concerning especially the SiC and TiC particles added to the initial material. The aim of this work was also to present the laser treatment technology which will be used for further alloying and remelting with ceramic powders – especially carbides and oxides. The innovatory arrangement of this investigation is based on the mixing of two different powders, which were fed simultaneously to the laser-treated aluminium surface. The overview focuses on the laser power required to achieve good layer hardness to prevent hot work tool steel from losing its work stability and to make the tool surface more resistant to action in external conditions. © (2015) Trans Tech Publications, Switzerland.

关键词： Silicon carbide

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Structure and mechanical properties of high-mn twip steel after their thermo-mechanical and heat treatments 24

Structure and mechanical properties of high-mn twip steel af...

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24th International Conference on Metallurgy and materials, METAL 2015

作者： Borek, Wojciech Tański, Tomasz Jonšta, Zdeněk Jonšta, Petr Čížek, Lubomir Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Gliwice Poland VSB-Technical University of Ostrava Ostrava Czech Republic VÍTKOVICE HEAVY MACHINERY A.s. Ostrava Czech Republic

ISBN: (纸本)9788087294628

The aim of this paper is to determine the impact of heat treatment of steel pre-treated thermo-mechanically using Gleeble 3800 simulator on the structure and mechanical properties of investigated high-manganese austenite Fe-Mn-(Al, Si) steel, containing 25% of Mn, 3% of Si, and 3% of Al. Applying thermo-mechanical treatment using Gleeble 3800 simulator allow to obtain the conditions for a gradual grain refinement controlled mainly by dynamic recrystallization and also by a dynamic recovery in a whole temperature deformation range. The high-manganese TWIP steel after hot-deformation is characterized by a mixture of fine, recrystallized grains and some fraction of dynamically recovered grains with a mean diameter of about 5-7m. Solution heat treatment of the specimens from a temperature 850 °C cause that steel possesses fine-grained microstructure of austenite with grain sizes about 10m. Increasing solution temperature from 850 to 1000 °C results in a rapid grain growth up to about 17m. Specimens were annealing at time 900 s, increasing solution time also cause a growth of austenite mean grain size in high-manganese Fe-25Mn-3Si-3Al TWIP steel. The new developed high-manganese TWIP steels provide an extensive potential for automotive industries through exhibiting the twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) mechanisms. TWIP steels not only show excellent strength, but also have excellent formability due to twinning, thereby leading to unique combination of strength, ductility, and formability over conventional dual phase steels or transformation induced plasticity TRIP steels.

关键词： Mechanisms

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Scanning electron microscopy and X-ray energy dispersive spectroscopy – useful tools in the analysis of pharmaceutical products

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Journal of Physics: Conference Series 2017年第1期931卷

作者： Beata Sarecka-Hujar Radoslaw Balwierz Aneta Ostrozka-Cieslik Renata Dyja Dariusz Lukowiec Andrzej Jankowski Medical University of Silesia in Katowice School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec Department of Pharmaceutical Technology Kasztanowa Str 3 41-200 Sosnowiec Poland Silesian Medical College in Katowice Mickiewicza Str 29 Katowice 40-085 Poland Silesian University of Technology Department of Materials Processing Technology Management and Computer Techniques in Materials Konarskiego Str 18a 44-10 Gliwice Poland

The quality of the drug, its purity and identification of degradation products provide the highest quality of pharmaceutical products. The energy dispersive spectroscopy (EDS) method analyses the percentage of each element form as well as their distribution, and morphological characteristics of the drug form. We analysed the usefulness of EDS method in testing orally disintegrating tablets (ODT) with trimetazidine hydrochloride with high resolution scanning electron microscopy (SEM, SUPRA25 Carl Zeiss company) with spectrophotometer equipped with an X-ray energy dispersion (EDAX Company). The samples of the analysed tablets were imaged after applying conductive layers of gold on their surface. In the EDS analysis the compositions of each sample of the obtained tablets were observed to be virtually identical. The differences in the content of carbon and oxygen came from differences in the composition of particular tablets. The presence of gold in the composition resulted from the sputtering the surface of tablets with gold during the analysis. Knowing the composition of the tablet, SEM-EDS method helps to locate and identify the impurities and degradation products of the compounds, leading to a better understanding of the mechanisms of their formation.

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Comparison of long-term ageing of binary Ag-Cu alloys

Comparison of long-term ageing of binary Ag-Cu alloys

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作者： Labisz, Krzysztof Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego Str 18A Gliwice Poland

ISBN: (纸本)9783038352556

Silver alloys, due to its specific properties are widely used in different branches of industry, with approximately 95% of the world silver production is used in the photographic industry and for jeweller production. Moreover Poland is a significant producer of silver in the world, and takes the 6th place on the list of the world's silver producers with the KGHM Polish Copper Company production on the first place among global companies providing silver on the market, with an annual production at 1281 tones. Because of this impotent role of silver, this work presents microstructure and mechanical properties investigations results of the long aged Ag-Cu alloys used mainly for mint monetary production. The purpose of this work was to determine the microstructural changes after 32 and 40 year of natural ageing time, with appliance of transmission electron microscopy as well as light microscopy. A very important issue - one of the investigations directions is also the possibility of study of spinodal decomposition process, which occurred in this alloy. After the long-time ageing of the material, there are detected morphological different areas of the Ag-α and Cu-β phase. As an implication for appliance in real conditions - as coin metal, or in electronic and chemical industry branches, there is the possibility of application of long term ageing for mechanical properties improvement by natural ageing method. Some other investigations should be performed in the future, but the knowledge found in this research shows an interesting investigation direction, where a low cost but long term treatment operations can be applied. © (2014) Trans Tech Publications, Switzerland.

关键词： Microstructure

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Structure and properties of the aluminium alloy Alsi12CuNiMg after laser surface treatment

Structure and properties of the aluminium alloy Alsi12CuNiMg...

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作者： Taski, Tomasz Dobrzaski, L.A. Pakiela, Wojciech Labisz, Krzysztof Roszak, Marek Tomiczek, Blaej Division of Materials Processing Technology Management and Computer Techniques in Materials Science Institute of Engineering Materials and Biomaterials Silesian University of Technology Konarskiego Str 18A Gliwice Poland

ISBN: (纸本)9783038352556

The investigations results concern the influence of laser heat treatment on the structure and mechanical properties of aluminium alloy, where the mutual relationships were tested and presented in this paper. The aim of this investigations was to improve the mechanical and wear resistance properties of the top surface layers of the aluminium alloy AlSi12CuNiMg by remelting and feeding the tungsten carbide powder into the molten material and next quick solidification. The powder of tungsten carbide has been introduced in the liquid metal using gravity feeder at a constant rate of 3 g/min. In order to remelting the aluminium alloy surface, there has been used the high power diode laser HPDL, with an applied power of the laser beam in the range between 1.6 kW and 2.0 kW. The linear laser scan rate of the beam was set as much as 0.4 m/min. As a result of laser treatment of aluminium alloy a composite layer with higher hardness and enhanced wear resistance compared to the base material has been obtained. © (2014) Trans Tech Publications, Switzerland.

关键词： Feeding

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