scholarly journals Wear Resistance Enhancement of Al6061 Alloy Surface Layer by Laser Dispersed Carbide Powders

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3683
Author(s):  
Rafał Jendrzejewski ◽  
Jacek Łubiński ◽  
Gerard Śliwiński
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Sliding Friction ◽  
Laser Energy ◽  
Mass Density ◽  
Surface Coatings ◽  
Alloy Surface ◽  
Al Alloy ◽  
Substrate Preheating ◽  
Alloy Surface Layer

In this paper, results of the experimental study on improving wear resistance in sliding friction of Al-based alloy are presented. The technique used involves the formation of a metal matrix composite (MMC) in the alloy surface layer by laser dispersion of carbide powders such as WC, TiC and SiC. For WC and TiC MMC surface coatings fabricated under conditions typical for most of the technologically relevant solid-state lasers (wavelength range of 0.8–1.1 μm), the nearly inversely proportional dependence of the required laser energy density on the powder mass density is observed. Highly homogenous distribution of powder particle content (up to 40%) in the MMC surface coatings of a thickness between 0.8 and 1.6 mm obtained by multiple scanning is observed in the cross-section of specimens processed within a rather narrow parameter window. Tribological tests and comparison to untreated material reveal wear resistance increases by five- and ten-fold, observed in samples with laser-dispersed TiC and WC powders, respectively. Results indicate that substantial modification and reinforcement of the surface layer can be achieved in Al alloy in a one-step process without substrate preheating.

Utilisation of High-Energy Heat Sources in Magnesium Alloy Surface Layer Treatment

2013 ◽  
Vol 58 (2) ◽  
pp. 619-624 ◽  
Author(s):  
M. Szafarska ◽  
J. Iwaszko ◽  
K. Kudła ◽  
I. Łegowik
Keyword(s):  
Surface Layer ◽  
Magnesium Alloy ◽  
Physicochemical Properties ◽  
Treatment Effectiveness ◽  
High Energy ◽  
Alloy Surface ◽  
Heat Sources ◽  
X Ray ◽  
Additional Equipment ◽  
Alloy Surface Layer

The main aim of the study was the evaluation of magnesium alloy surface treatment effectiveness using high-energy heat sources, i.e. a Yb-YAG Disk Laser and the GTAW method. The AZ91 and AM60 commercial magnesium alloys were subject to surface layer modification. Because of the physicochemical properties of the materials studied in case of the GTAW method, it was necessary to provide the welding stand with additional equipment. A novel two-torch set with torches operating in tandem was developed within the experiment. The effectiveness of specimen remelting using a laser and the GTAW method was verified based on macro- and microscopic examinations as well as in X-ray phase analysis and hardness measurements. In addition, the remelting parameters were optimised. The proposed treatment methodology enabled the achieving of the intended result and effective modification of a magnesium alloy surface layer.

Phase and structural states in the NiTi-based alloy surface layer formed by electron-ion-plasma methods using tantalum

2015 ◽  
Author(s):  
Aleksei A. Neiman ◽  
Ludmila L. Meisner ◽  
Aleksandr I. Lotkov ◽  
Ekaterina Y. Gudimova ◽  
Viktor O. Semin
Keyword(s):  
Surface Layer ◽  
Alloy Surface ◽  
Ion Plasma ◽  
Plasma Methods ◽  
Alloy Surface Layer

scholarly journals Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

2016 ◽  
Vol 16 (1) ◽  
pp. 13-18
Author(s):  
J. Iwaszko ◽  
M. Strzelecka
Keyword(s):  
Surface Layer ◽  
Magnesium Alloy ◽  
Structural Changes ◽  
Continuous Wave ◽  
Sample Surface ◽  
Alloy Surface ◽  
Az91 Alloy ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Alloy Surface Layer

Abstract In this study, modification of the AZ91 magnesium alloy surface layer with a CO2 continuous wave operation laser has been taken on. The extent and character of structural changes generated in the surface layer of the material was being assessed on the basis of both macro- and microscopy investigations, and the EDX analysis. Considerable changes in the structure of the AZ91 alloy surface layer and the morphology of phases have been found. The remelting processing was accompanied by a strong refinement of the structure and a more uniform distribution of individual phases. The conducted investigations showed that the remelting zone dimensions are a result of the process parameters, and that they can be controlled by an appropriate combination of basic remelting parameters, i.e. the laser power, the distance from the sample surface, and the scanning rate. The investigations and the obtained results revealed the possibility of an effective modification of the AZ91 magnesium alloy surface layer in the process of remelting carried out with a CO2 laser beam.

Modification of Al-Si alloy surface layer using Nd:YAG laser

2006 ◽  
Author(s):  
Agnieszka E. Radziszewska ◽  
Sławomir Z. Kąc
Keyword(s):  
Surface Layer ◽  
Nd:Yag Laser ◽  
Alloy Surface ◽  
Alloy Surface Layer

One‐step preparation of the superhydrophobic Al alloy surface with enhanced corrosion and wear resistance

2020 ◽  
Author(s):  
Tian Shi ◽  
Xuewu Li ◽  
Chuanwei Zhang ◽  
Hongxing Wang ◽  
Zhenyan He ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion And Wear ◽  
Alloy Surface ◽  
Al Alloy ◽  
One Step

Ni-Based Alloy Surface Layer on Copper Fabricated by Combination of Laser Cladding and Friction Stir Welding

2016 ◽  
Vol 43 (1) ◽  
pp. 0106003
Author(s):  
赵静梅 Zhao Jingmei ◽  
高士友 Gao Shiyou ◽  
牟明强 Mu Mingqiang ◽  
付瑞东 Fu Ruidong ◽  
李毅军 Li Yijun
Keyword(s):  
Surface Layer ◽  
Friction Stir Welding ◽  
Laser Cladding ◽  
Alloy Surface ◽  
Friction Stir ◽  
Alloy Surface Layer
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