oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 1 )

2019 ( 11 )

2018 ( 45 )

2017 ( 36 )

Custom range...

Search Results: 1 - 10 of 3160 matches for " Aluminium cast alloys "
All listed articles are free for downloading (OA Articles)
Page 1 /3160
Display every page Item
Anodization of cast aluminium alloys produced by different casting methods
K. Labisz,L.A. Dobrzański,J. Konieczny
Archives of Foundry Engineering , 2008,
Abstract: In this paper the usability of two casting methods, of sand and high pressure cast for the anodization of AlSi12 and AlSi9Cu3 aluminium cast alloys was investigated. With defined anodization parameters like electrolyte composition and temperature, current type and value a anodic alumina surface layer was produced. The quality, size and properties of the anodic layer was investigated after the anodization of the chosen aluminium cast alloys. The Alumina layer was observed used light microscope, also the mechanical properties were measured as well the abrasive wear test was made with using ABR-8251 equipment. The researches included analyze of the influence of chemical composition, geometry and roughness of anodic layer obtained on aluminum casts. Conducted investigations shows the areas of later researches, especially in the direction of the possible, next optimization anodization process of aluminum casting alloys, for example in the range of raising resistance on corrosion to achieve a suitable anodic surface layer on elements for increasing applications in the aggressive environment for example as materials on working building constructions, elements in electronics and construction parts in air and automotive industry.
Methodology of analysis of casting defects
L.A. Dobrzański,M. Krupiński,J.H. Sokolowski,P. Zarychta
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The goal of this publication is to present the methodology of the automatic supervision and controlof the technological process of manufacturing the elements from aluminium alloys and of the methodology ofthe automatic quality assessment of these elements basing on analysis of images obtained with the X-ray defectdetection, employing the artificial intelligence tools. The methodologies developed will make identification andclassification of defects possible and the appropriate process control will make it possible to reduce them andto eliminate them - at least in part.Design/methodology/approach: The methodology is presented in the paper, making it possible to determine thetypes and classes of defects developed during casting the elements from aluminium alloys, making use photosobtained with the flaw detection method with the X-ray radiation. It is very important to prepare the neuralnetwork data in the appropriate way, including their standardization, carrying out the proper image analysis andcorrect selection and calculation of the geometrical coefficients of flaws in the X-ray images. The computersoftware was developed for this task.Findings: Combining of all methods making use of image analysis, geometrical shape coefficients, and neuralnetworks will make it possible to achieve the better efficiency of class recognition of flaws developed in thematerial.Practical implications: The presented issues may be essential, among others, for manufacturers of carsubassemblies from light alloys, where meeting the stringent quality requirements ensures the demanded servicelife of the manufactured products.Originality/value: The correctly specified number of products enables such technological process control thatthe number of castings defects can be reduced by means of the proper correction of the process.
Effect of selected microadditives on the mechanical properties of aluminium alloys
Rzadkosz S.,Staszczak L.
Archives of Foundry Engineering , 2007,
Abstract: The effect of iron impurities on microstructure and mechanical properties of cast Al-Cu and Al-Zn-Mg alloys was discussed. The role of iron in the process of solutioning and ageing of these alloys was described. Basing on the results of investigations, a comparative analysis was made to disclose the effect of low content (microadditives) of the elements, like Mn, Ti, Zr, B, Cr, Ni, Zn, Sn, Cd, In, Mg, Sb, and Ag on the primary structure of castings, mainly on the morphology of iron-bonding intermetallic phases. The studies also allowed for an effect of these elements on dispersion hardening of the examined alloys, reflected in an improvement of the principal mechanical properties (Rm, A5, HV), and on the kinetics of ageing. Tin, cadmium and indium, added in an amount of 0,1 – 0,15 %, were reported to have the strong-est effect on the process of dispersion hardening. Beneficial effect on the morphology of iron phases have manganese, chromium and nickel.
HPDL Remelting of Anodised Al-Si-Cu Cast Alloys Surfaces
K. Labisz,T. Tański,D. Janicki
Archives of Foundry Engineering , 2012,
Abstract: The results of the investigations of the laser remelting of the AlSi9Cu4 cast aluminium alloy with the anodised and non-anodised surfacelayer and hardness changes have been presented in this paper. The surface layer of the tested aluminium samples was remelted with thelaser of a continuous work. The power density was from 8,17 103 W/cm2 to 1,63 104 W/cm2. The metallographic tests were conducted inform of light microscope investigations of the received surface layer. The main goal of the investigation was to find the relation betweenthe laser beam power and its power density falling on a material, evaluating the shape and geometry of the remelted layers and theirhardness. As the substrate material two types of surfaces of the casted AlSi9Cu4 alloy were applied – the non–treated as cast surface aswell the anodized surface. As a device for this type of surface laser treatment the High Power Diode Laser was applied with a maximumpower of 2.2 kW and the dimensions of the laser beam focus of 1.8 x 6.8 mm. By mind of such treatment it is also possible to increasehardness as well eliminate porosity and develop metallurgical bonding at the coating-substrate interface. Suitable operating conditions forHPDL laser treatment were finally determined, ranging from 1.0 to 2.0 kW. Under such conditions, taking into account the absorptionvalue, the effects of laser remelting on the surface shape and roughness were studied. The results show that surface roughness is reducedwith increasing laser power by the remelting process only for the non-anodised samples, and high porosity can be found in the with highpower remelted areas. The laser influence increases with the heat input of the laser processing as well with the anodisation of the surface,because of the absorption enhancement ensured through the obtained alumina layer.
Abrasive wear of BA1055 bronze with additives of Si, Cr, Mo and/or W
B. P. Pisarek
Archives of Foundry Engineering , 2008,
Abstract: Aluminium bronzes belong to the high-grade constructional materials applied on the put under strongly load pieces of machines, aboutgood sliding, resistant properties on corrosion both in the cast state how and after the thermal processing. It moves to them Cr and Si in the aim of the improvement of their usable proprieties. The additions Mo and/or W were not applied so far. It was worked out therefore the new kind of bronzes casting including these elements. Make additions to the Cu-Al-Fe-Ni bronze of Si, Cr, Mo and/or W in the rise of these properties makes possible. The investigations of the surface distribution of the concentration of elements in the microstructure of the studied bronze on X-ray microanalyzer were conducted. It results from conducted investigations, that in the aluminium bronze BA1055 after makes additions Si, Cr, Mo and/or W the phases of the type κFe, κNi crystallize, probably as complex silicides. Elements such as: Fe and Si dissolve first of all in phases κ, in smaller stage in the matrix of the bronze; Mn, Ni and W they dissolve in matrix and phases κ. It dissolves Cr and Mo in the larger stage in phases κ than in the matrix. The sizes of the abrasive wear were compared in the state cast multicomponentnew casting Cu-Al-Fe-Ni bronzes with the additives Cr, Mo or W with the wear of the bronze CuAl10Fe5Ni5Si. The investigations of thewear were conducted on the standard device. It results from conducted investigations, that make additions to bronze BA1055 of the additives of Si, Cr, Mo, and/or W it influences the rise of the hardness (HB) of the bronze in the cast state, in the result of the enlarged quantity separates of hard phases κ, and in the consequence the decrease of the abrasive wear. The addition of molybdenum made possible obtainment of the microhardness of the phase α and γ 2 on the comparable level. From the microstructure of the bronze CuAl10Fe5Ni5MoSi is characterizes the smallest abrasive wear among studied bronzes. More far works over new multicomponent aluminium bronzes will be guided in the direction of the identification of the changes of mechanical properties of studied bronzes under the influence of the thermal processing.
TEM microstructure investigations of aluminium alloys used for laser alloying
K. Labisz,M. Krupiński,T. Tański
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: In this paper there are presented results of Transmission Electron Microscope investigation concerning the structure of the AlSi7Cu4 cast aluminium alloy using for alloying and remelting with the high power diode laser (HPDL). There are also presented the results of the thermo-derivative analysis performed using the UMSA (Universal Metallurgical Simulator and Analyser) device, allowing to determine the specific points of the solidifying alloy, what is helpful for phase determination occurred in this alloy. In this work especially the changes of the precipitation type, size and shape were determined.Design/methodology/approach: The investigations were performed using electron microscopy for the microstructure and phases determination. By mind of the transmission electron microscopy, especially selected area diffraction method appliance it was possible to determine the phases occurred in the alloy in the as cast state. The morphology and size of the Mg2Si was also possible to determine as well the lattice parameters for this phase.Findings: : The reason 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. Particularly the overview will be directed on the laser power to achieve good layer hardness for protection of this hot work tool steel from losing their work stability and to make the tool surface more resistant to action in external conditions. The structure of the surface laser tray changes in a way, that there are very high roughness of the surface zone and the flatness or geometry changes in an important manner, crucial for further investigation.Research limitations/implications: The aluminium samples were examined metallographically using transmission electron microscope with different image techniques.Practical implications: Developing of new technology with appliance of Al alloys, High Power Diode Laser and diverse ceramic powders will be possible to obtain, based in findings from this research project. Some other investigation should be performed in the future, but the knowledge found in this research concerning the proper process parameters for each type of alloy shows an interesting investigation direction.Originality/value: The combination of metallographic investigation for cast aluminium alloys - including electron microscope investigation - and HPDL treatment parameters makes the investigation very attractive for automobile, aviation industry, and others where aluminium alloys plays an important role.
Challenges in Thermal Welding of Aluminium Alloys  [PDF]
Emil Schubert
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.62018
Abstract: Modern transport systems have the challenge to integrate more and more functions. This increases the weight of the structures. On the other hand demands and the legal regulations for emissions can only be fulfilled if the weight is reduced. This results in an ongoing increase of the usage of lightweight materials. Due to its low density and high strength Aluminium Alloys are the most used lightweight metals. However, some other physical properties hamper the processing of these alloys. The publication shows ways to overcome these challenges applying appropriate material preparation and handling in combination with specialized welding equipment for Aluminium welding. Application examples demonstrate the state of the art in Aluminium welding.
Microstructural characterization and process selection by attributive analysis of eutectic and quasi-eutectic Al-Si alloys for pressure die casting
Suárez-Pe?a, B.,Asensio-Lozano, J.,Verdeja-González, J. I.,Pero-Sanz Elorz, J. A.
Revista de Metalurgia , 2007,
Abstract: In the present study, four alloys from diverse suppliers suitable for obtaining 413.0 metallurgical quality products together with alloy number 2 with an slightly hypoeutectic composition in Silicon were processed. The study focused on the microstructural characterization of the as-received ingots, as well as that of samples obtained from the production process: die cast samples and cold chamber pressure die cast samples. Finally a materials selection process base on microstructural grounds has been put forward as to determine the most suitable starting alloy for industrial production. En el presente trabajo se han analizado cinco aleaciones procedentes de diferentes proveedores aptas para la obtención de componentes de la calidad metalúrgica 413.0, con excepción de la aleación 2 de composición levemente hipoeutéctica. El estudio se centra en la caracterización microestructural de los lingotes en estado de recepción, así como de las muestras obtenidas a partir del proceso de fabricación: muestras coladas en molde metálico y muestras fabricadas mediante fundición a presión en cámara fría. Finalmente se propone un proceso de selección de material basado en consideraciones microestructurales que permite determinar la aleación de partida más apta para la producción industrial mediante fundición a presión.
Comparison of the Mechanical Properties of AL6061/Albite and AL6061/Graphite Metal Matrix Composites  [PDF]
A. Ramesh, J. N. Prakash, A. S. Shiva Shankare Gowda, Sonnappa Appaiah
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.82009
Abstract: The aim of this present investigation is to carry out a comparative study of the mechanical properties of AL6061/Albite composites containing albite(NaAlSi3O8) particulates, which are naturally occurring plagioclase feldspar and AL6061/graphite particulate composites containing graphite particles. The reinforcing particulates in the MMC’s vary from 0% to 4% by weight. The 'vortex method' of production was employed to fabricate the composites, in which the reinforcements were poured into the vortex created by stirring the molten metal by means of a mechanical agitator. The composites so produced were subjected to a series of tests. The results of this study revealed that as the Albite particle content was increased, there were significant increases in the ultimate tensile strength, hardness and Young's modulus, accompanied by a reduction in its ductility. There was, however, only a very marginal increase in the compressive strength, where as in graphite reinforced composites as the graphite content was increased, there were significant reduction in hardness and monotonic increases in the ductility, ultimate tensile strength (UTS), compressive strength and Young's modulus of the composite, An attempt is made in the paper to provide explanations for these phenomena.
Cast Intermetallic Alloys and Composites Based on Them by Combined Centrifugal Casting—SHS Process  [PDF]
Vladimir Sanin,Dmitry Andreev,Denis Ikornikov,Vldimir Yukhvid
Open Journal of Metal (OJMetal) , 2013, DOI: 10.4236/ojmetal.2013.32a2003
Abstract: This work aims to establish a scientific and engineering background in the production of cast multicomponent alloys and metalmartix composite (MMCs) via Self-Propagating High Temperature Synthesis (SHS, combustion synthesis) which is a novel process technique regarding fast and low-cost production ability. We carried out the search for reactive systems and process parameters that would ensure preparation of cast multicomponent materials in a single process. The principles and methods of the SHS thermite-type reaction processes have been investigated under high-gravity values applying loads up to 1000 g with special centrifuge set-up. In this way we expected to improve the yield of target product, remove gaseous byproducts, diminish the grain size in the product, and make product composition more uniform. The obtained results can be expected to make a theoretical background for industrial-scale manufacturing of heat-resistant intermetallic alloys, master alloys, catalysts, MMCs etc.
Page 1 /3160
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.