Surface Modification of Aluminum Alloys Prepared by Plasma-Based-Ion-Implantation Technique

The aluminum alloys AA5052, AA5083 and Al-7%Si (AC4C) were nitrided by electron beam excited plasma (EBEP) technique to improve wear resistance and hardness. The specimens were characterized with respect to the following properties: wear resistance, hardness of nitrided layer (AlN layer), surface and cross sectional microstructures. The friction coefficient of nitrided AA5052 decreased to 0.2 and that of Al-7%Si was improved to 0.1. The AlN layers were relatively uniformly formed on the AA5052 and AC4C alloys with a thickness of 4.5 μm and 2.5 μm during 2hrs and 5.4 ks, respectively. On the surface of nitrided AA5083, a uniform AlN layer was not formed due to the high nitriding temperature. The Si3N4 was found in the nitrided AC4C alloy.

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Deep Cryogenic Treatment and CrN Coating Effects on Micro-Scale Abrasion of Aluminum Alloy AA 6101-T4

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.1047 ◽

2014 ◽

Vol 936 ◽

pp. 1047-1055 ◽

Cited By ~ 1

Author(s):

Edgar S. Ashiuchi ◽

Volker F. Steier ◽

Cosme R.M. Silva ◽

Tales D. Barbosa ◽

Tiago F.O. Melo ◽

...

Keyword(s):

Wear Resistance ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Wear Rate ◽

Cryogenic Treatment ◽

Deep Cryogenic Treatment ◽

Low Wear ◽

The Impact ◽

Improve Wear Resistance ◽

Wear Tests

The endurance of components made of aluminum and aluminum alloys is often limited by their low yield strength and by their low wear resistance. The aim of this paper is to investigate the effect of different methods that can improve wear resistance of aluminum alloys. As a first approach, a highly wear resistant chromium nitrite layer was deposited by plasma vapor deposition on the surface of the aluminum alloy AA 6101-T4. In the second method, an ultra-deep cryogenic treatment was selected. Both methods have been previously used to improve the wear resistance of other harder substrate materials, like tool steel. To investigate the impact of the two methods on the wear resistance of such alloy, micro abrasive wear tests were carried out and an analysis based on the Archard’s law was considered. The results showed a decrease of the wear rate by 29% and 26% for the coated and for the cryogenically treated specimens, respectively, when compared to the as received material. The work also investigated the performance of three different methods (Allsopp, Double Intercept and Polynomial AT) usually considered to calculate the wear rate of coated samples. The three methods presented similar measures of wear rate for the substrate and for the coating

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711 Improvement of wear resistance and Fatigue Strength of Aluminum Alloys by DLC Surface modification

The Proceedings of Ibaraki District Conference ◽

10.1299/jsmeibaraki.2014.22.117 ◽

2014 ◽

Vol 2014.22 (0) ◽

pp. 117-118

Author(s):

Masashi NAKAMURA ◽

Hideto Suzuki ◽

Tadao Haraguti ◽

Sadayuki Kubota

Keyword(s):

Wear Resistance ◽

Surface Modification ◽

Fatigue Strength ◽

Aluminum Alloys

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Surface modification of AISI H13 steel by die-sinking electrical discharge machining and TiAlN coating: A promising hybrid technique to improve wear resistance

Wear ◽

10.1016/j.wear.2020.203509 ◽

2020 ◽

Vol 462-463 ◽

pp. 203509

Author(s):

Sinval Pedroso da Silva ◽

Alexandre Mendes Abrão ◽

Ernane Rodrigues da Silva ◽

Marcelo Araújo Câmara

Keyword(s):

Wear Resistance ◽

Surface Modification ◽

Electrical Discharge ◽

Electrical Discharge Machining ◽

Hybrid Technique ◽

H13 Steel ◽

Tialn Coating ◽

Aisi H13 Steel ◽

Aisi H13 ◽

Improve Wear Resistance

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Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

Metals ◽

10.3390/met9080848 ◽

2019 ◽

Vol 9 (8) ◽

pp. 848

Author(s):

Xiang ◽

Wu ◽

Liu ◽

Cao ◽

Dong

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Mass Loss ◽

Duplex Stainless Steel ◽

Diffusion Layer ◽

Nitrided Layer ◽

Compound Layer ◽

Test Time ◽

Nitriding Temperature ◽

Cumulative Mass

The effect of quench polish quench (QPQ) nitriding temperature on the microstructure and wear resistance of SAF2906 duplex stainless steel was investigated. Results showed the surface of the nitrided samples was composed of an oxidized layer, a loose compound layer, a compact compound layer, and a diffusion layer. The oxidized layer was composed of Fe3O4. The main phases of the loose compound layer were CrN, αN, Fe2–3N, and Fe3O4. The compact compound layer was composed of CrN, αN, and Fe2–3N. In the diffusion layer, CrN and expanded austenite (S) were the main phases. The nitrided layer thickness increased from 20 to 41 μm with an increasing temperature of 570 to 610 °C. When the nitriding temperature was above 590 °C, the precipitates in the diffusion layer became coarsened, and their morphologies gradually changed from spherical particulate to rod-like and flocculent-like. Tribotests showed the cumulative mass loss of QPQ-treated samples was much lower than that of the substrate. The cumulative mass loss of the samples nitrided at 610 °C was higher than that at 570 °C during the first 29 h. When the test time was over 29 h, the former was lower than the latter.

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Surface Modification of Aluminum Alloy Using Plasma Based Ion Implantation and Deposition

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.488-489.960 ◽

2012 ◽

Vol 488-489 ◽

pp. 960-966 ◽

Cited By ~ 1

Author(s):

Tadahiro Wada ◽

Jun Nakanishi ◽

Yasuhiro Miki ◽

Makoto Asano ◽

Koji Iwamoto ◽

...

Keyword(s):

Wear Resistance ◽

Surface Modification ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Multilayer Coating ◽

Frictional Coefficient ◽

Negative Influence ◽

Dlc Film ◽

Mechanical Parts ◽

Silicon Based

Aluminum alloys are used for mechanical parts, but the alloys have poor wear-resistance. To increase their wear resistance, a hard coating is applied to the surface of the alloys. Diamond-like carbon (DLC) is applied in surface modification technology due to its superior mechanical characteristics. In this study, in order to achieve effective surface modification to improve the wear resistance of the aluminum alloys, a new coatings-system was designed. This coating-substrate system is a multilayer coating-substrate system, which consists of nitriding pretreatment of the substrate, the intermediate layer of the silicon-based film and the outer layer of the DLC film. This new coating-system was used to deposit DLC film on three kinds of aluminum alloys that have different Si contents. In order to determine the influence of the Si contents on the mechanical properties of the DLC film, SEM observation of the cross section of the coating layer, the adhesion and the wear resistance of the layer were experimentally investigated. The results were as follows: (1) In the case of the DLC un-coated aluminum alloys, the rapid progress of the friction coefficient in the case of 10-N load was found at the short sliding distance. (2) The hardness of the DLC film was not decreased with the increase of Si contents. And the increase of Si contents did not have a negative influence upon the hardness of the DLC film. (3) The frictional coefficient of the Al-4%Si alloy was the smallest, the frictional coefficient of the DLC film was decreased with the increase of Si contents, and it was effective for improvement of the frictional coefficient to increase Si contents. The new coating-substrate system is effective for improving the adhesion between the substrate of the aluminum alloy and the DLC film. Moreover, the increase of Si contents was effective for the decrease in the frictional coefficient.

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Surface Modification of Aluminum Alloys Prepared by Plasma-Based-Ion-Implantation Technique

Solid State Phenomena - Heat Treatment of Materials ◽

10.4028/3-908451-25-6.269 ◽

2006 ◽

pp. 269-274

Author(s):

Li Liu ◽

Atsushi Yamamoto ◽

Takanori Hishida ◽

Hiroaki Shoyama ◽

Tamio Hara ◽

...

Keyword(s):

Surface Modification ◽

Aluminum Alloys ◽

Ion Implantation ◽

Implantation Technique

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Effect of Pulsed High Energy Electron Beam on Surface Modification of AZ91 Magnesium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.547 ◽

2007 ◽

Vol 546-549 ◽

pp. 547-550

Author(s):

Wei Lv ◽

Hui Zhao ◽

Zhong Han ◽

Zhen Liu

Keyword(s):

Wear Resistance ◽

Surface Layer ◽

Surface Modification ◽

Electron Beam ◽

Magnesium Alloy ◽

High Energy ◽

Az91 Alloy ◽

High Energy Electron ◽

Az91 Magnesium Alloy ◽

Az91 Magnesium

Effect of pulsed high-energy electron beam on the surface modification and the state of surface layer and wear resistance of AZ91 magnesium alloy have been investigated in this study. Optical microscope (OM) and X-ray diffraction (XRD) were employed to characterize the microstructure and phase composition of the modified surface layer. It was found that the thickness of melted layer on the surface varied with electron beam current and the numbers of pulses, the treated surface layer exhibited higher hardness than AZ91 alloy. The friction coefficient and the wear volume of AZ91 alloy after electron beam treatment decrease markedly. The wear resistance of treated samples were significantly improved, which may be attributed to high hardness as a result of grain refinement.

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X-ray micro tomography in the scanning electron microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107678 ◽

1978 ◽

Vol 36 (1) ◽

pp. 106-107 ◽

Cited By ~ 1

Author(s):

W. Brünger

Keyword(s):

Electron Beam ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Target Surface ◽

The Body ◽

X Rays ◽

Cross Sectional ◽

X Ray ◽

Micro Tomography ◽

Scanning Electron

Reconstructive tomography is a new technique in diagnostic radiology for imaging cross-sectional planes of the human body /1/. A collimated beam of X-rays is scanned through a thin slice of the body and the transmitted intensity is recorded by a detector giving a linear shadow graph or projection (see fig. 1). Many of these projections at different angles are used to reconstruct the body-layer, usually with the aid of a computer. The picture element size of present tomographic scanners is approximately 1.1 mm2.Micro tomography can be realized using the very fine X-ray source generated by the focused electron beam of a scanning electron microscope (see fig. 2). The translation of the X-ray source is done by a line scan of the electron beam on a polished target surface /2/. Projections at different angles are produced by rotating the object.During the registration of a single scan the electron beam is deflected in one direction only, while both deflections are operating in the display tube.

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