Comparative study of the energy state of the surface layer of aluminium alloys after milling treatment

The purpose of this work is electron microscope investigation of the Ti/TiCN/TiAlN and Cr/CrN/CrN coatings deposited by PVD process. The investigations were performed using scanning and transmission electron microscopy for the microstructure determination. By mind of the transmission electron microscopy the high resolution and phase determination was possible to obtain. The morphology was studied as well the lattice parameters for the layer matrix and substrate phase identification using diffraction methods was applied. After the coating of the aluminium alloys AlSi9Cu and AlSi9Cu4 with the selected coatings there are crystallites detected with the size of several tenth of diameter. The investigated samples were examined metallographically using electron microscope with different image techniques, also EDS microanalysis and electron diffraction was made. As an implication for the practice a new layer sequence can be possible to develop, based on PVD technique. Some other investigation should be performed in the future, but the knowledge found in this research shows an interesting investigation direction. The originality and value of this combination of TEM investigation for PVD deposited surface lasers on aluminium alloys makes the investigation very attractive for automotive and other industry branches. Some practical implications and employment of the surface treatment technology for elements, made from tool materials, with the PVD and CVD methods, to obtain the high wear resistant coatings, makes it possible to improve the properties of these materials by – among others – decreasing for example their friction coefficient, microhardness increase, improvement of the tribological contact conditions in practical use. One original value is it also to applied the PVD method on a common material like aluminium alloy. The double layer coatings worked out In the PVD process on the Al0Si-Cu alloys substrate hale the following configuration of the layers: bottom layer/gradient layer/wear resistant hard surface layer.

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Change of energy state in the surface layer at the stages of vacuum ion-plasma treatment process

Journal of Physics Conference Series ◽

10.1088/1742-6596/729/1/012011 ◽

2016 ◽

Vol 729 ◽

pp. 012011

Author(s):

V V Plikhunov ◽

L M Petrov

Keyword(s):

Surface Layer ◽

Plasma Treatment ◽

Treatment Process ◽

Energy State ◽

Ion Plasma

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Comparative study of severe plastic deformation at elevated temperatures of two aluminium alloys during friction surfacing

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2017.04.021 ◽

2017 ◽

Vol 247 ◽

pp. 257-267 ◽

Cited By ~ 16

Author(s):

S. Hanke ◽

J.F. dos Santos

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

Comparative Study ◽

Aluminium Alloys ◽

Elevated Temperatures ◽

Friction Surfacing

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Analysis of Surface and Subsurface Layers after Shot Peening of Various Aluminium Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.89-91.53 ◽

2010 ◽

Vol 89-91 ◽

pp. 53-58

Author(s):

Sebastjan Žagar ◽

Janez Grum

Keyword(s):

Surface Layer ◽

Crack Initiation ◽

Residual Stresses ◽

Surface Integrity ◽

Shot Peening ◽

Aluminium Alloys ◽

Surface Hardening ◽

Hardened Layer ◽

Operating Pressure ◽

Subsurface Layers

In the paper two aluminium alloys, i.e. 6082 and 7075, which were cold hardened by shot peening under different conditions, are treated. Surface hardening was carried out with S170 steel shot of the same diameter, particle hardness being 56 HRC. Other conditions were the operating pressure, mass flow, which provide different Almen intensities. The hardened layer was described by surface integrity. Macroscopic and microscopic analyses consisted in analyses of hardened profiles of hardness, and residual stresses in the thin surface layer. Research results indicated that there were significant differences among the characteristics chosen to describe surface integrity and that they had an important influence on the final condition of the surface layer. With too severe settings of the peening parameters, the surface properties got worse because of damages, which resulted in crack initiation and growth of the existing cracks.

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Application of Anodization Process for Cast Aluminium Surface Properties Enhancement

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0222 ◽

2016 ◽

Vol 61 (3) ◽

pp. 1351-1356

Author(s):

A. Włodarczyk-Fligier ◽

K. Labisz ◽

M. Polok-Rubiniec ◽

J. Konieczny

Keyword(s):

Corrosion Resistance ◽

Surface Layer ◽

Aluminium Alloys ◽

Light Metal ◽

Test Results ◽

Metallographic Examination ◽

Ceramic Phase ◽

Treatment Processes ◽

Anodization Process

Abstract An huge interest is observed in last years in metal matrix composite, mostly light metal based, which have found their applications in many industry branches, among others in the aircraft industry, automotive-, and armaments ones, as well as in electrical engineering and electronics, where one of the most important issue is related to the corrosion resistance, especially on the surface layer of the used aluminium alloys. This elaboration presents the influence of ceramic phase on the corrosion resistance, quality of the surface layer its thickness and structure of an anodic layer formed on aluminium alloys. As test materials it was applied the aluminium alloys Al-Si-Cu and Al-Cu-Mg, for which heat treatment processes and corrosion tests were carried out. It was presented herein grindability test results and metallographic examination, as well. Hardness of the treated alloys with those ones subjected to corrosion process were compared.

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Studies of Atmospheric Parameters during SW Monsoon Period Associated with Severe Cyclone Aila and Lightning Occurrence over Ranchi Region

ISRN Meteorology ◽

10.5402/2012/975790 ◽

2012 ◽

Vol 2012 ◽

pp. 1-3

Author(s):

Abhay Srivastava ◽

Manoj Kumar ◽

Arun K. Dwivedi

Keyword(s):

Surface Layer ◽

Wind Speed ◽

Electric Field ◽

Comparative Study ◽

Correlation Coefficients ◽

Atmospheric Parameters ◽

Monsoon Period ◽

Cyclone Aila ◽

Layer Parameter ◽

Sw Monsoon

A number of events are happening every time in the atmosphere in which much of them are randomly generated. Parameters are varying daily like temperature, humidity, electric field, and wind speed. Variation on surface layer parameters, events thunderstorms, earthquake, volcanoes, cyclone, tsunami, and so forth are occurring. Study and correlation between surface layer parameter and occurrence are greatly required in current research scenario. A comparative study about atmospheric parameters has been done just after the Aila; in the day when lightning occurred and correlation coefficients between these parameters are observed.

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