Effects of heat treatment on the wear behavior of surfacing AZ91 magnesium alloy

AbstractIn this study, conventional WC-12Co cermet coatings were deposited on AZ91 magnesium alloy using High Velocity Oxy-Fuel spray method. The effects of different coating thicknesses (60 and 120 µm) and wear loads (20 and 30 N) on tribological properties of AZ91 magnesium alloy coated with WC-12Co were investigated. Structural, mechanical and tribological properties of WC-12Co coatings were analyzed by means of X-ray diffractometer, scanning electron microscope, micro-hardness tester and pin-on-disc tribotester. It was observed that WC-12Co coating is an effective method for improving the wear behavior of AZ91 magnesium alloy.

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Ceria Coatings Prepared by Sol-Gel Approach on AZ91 Magnesium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.1369 ◽

2017 ◽

Vol 898 ◽

pp. 1369-1380 ◽

Cited By ~ 1

Author(s):

Hui Min Han ◽

Dan Tong Wang ◽

Hua Qian Yu ◽

Min Zuo ◽

Li Hong Wang ◽

...

Keyword(s):

Heat Treatment ◽

Corrosion Resistance ◽

Magnesium Alloy ◽

Sol Gel ◽

Electrochemical Corrosion ◽

Chemical Conversion ◽

Corrosion Current ◽

Az91 Alloy ◽

Az91 Magnesium Alloy ◽

Az91 Magnesium

The ceria coatings on AZ91 substrates were successfully synthesized by chemical conversion and the corrosion resistance of AZ91 samples with and without ceria coatings were evaluated by means of electrochemical corrosion in 3.5 wt.% NaCl solution. According to the parameters derived from the polarization date, the Icorr (the corrosion current density) values of the coated samples are smaller than that of bare one, indicating that the corrosion resistance of AZ91 alloys has been improved to some extent. The influence of fluoridated pretreatment, inter-layer heat treatment, sintering temperature and the layer of films on the performance of ceria coatings were also investigated. It was found that the inter-layer heat treatment has no influence on improving the anticorrosion resistance of AZ91 alloy. In comparison with the bare one, the Icorr of optimal sample is about 0.0219mA/cm2, which decreases by two orders of magnitude, indicating that the ceria coatings could significantly improve the corrosion resistance of AZ91 magnesium alloy.

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Retraction notice to: “Effect of grain orientation on friction and wear behavior of AZ91 magnesium alloy” [Lett. Mater. 11(2) (2021) 135-139]

Letters on Materials ◽

10.22226/2410-3535-2021-3-367 ◽

2021 ◽

Vol 11 (3) ◽

pp. 367-367

Author(s):

Mukesh Kumar

Keyword(s):

Magnesium Alloy ◽

Grain Orientation ◽

Friction And Wear ◽

Wear Behavior ◽

Az91 Magnesium Alloy ◽

Friction And Wear Behavior ◽

Az91 Magnesium ◽

Retraction Notice

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Semisolid processing AZ91 magnesium alloy by electromagnetic stirring after near-liquidus isothermal heat treatment

Materials Science and Engineering A ◽

10.1016/j.msea.2007.04.049 ◽

2008 ◽

Vol 475 (1-2) ◽

pp. 194-201 ◽

Cited By ~ 37

Author(s):

Xiao-li Zhang ◽

Ting-ju Li ◽

Hai-tao Teng ◽

Shui-sheng Xie ◽

Jun-ze Jin

Keyword(s):

Heat Treatment ◽

Magnesium Alloy ◽

Electromagnetic Stirring ◽

Isothermal Heat Treatment ◽

Semisolid Processing ◽

Az91 Magnesium Alloy ◽

Az91 Magnesium

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Effect of Precipitates on Mechanical and Tribological Performance of AZ91 Magnesium Alloy–Steel Couple

Journal of Tribology ◽

10.1115/1.4029248 ◽

2015 ◽

Vol 137 (2) ◽

Cited By ~ 9

Author(s):

Deepak Kumar ◽

Jayant Jain ◽

Tulsi Bisht ◽

Anuz Zindal

Keyword(s):

Magnesium Alloy ◽

Wear Behavior ◽

Tribological Performance ◽

Az91 Alloy ◽

Az91 Magnesium Alloy ◽

Mechanical And Tribological Properties ◽

Mg17al12 Phase ◽

Az91 Magnesium ◽

Steel Aisi ◽

Pin On Disk

The present work involves the study of the effect of precipitates on mechanical and tribological properties of AZ91 magnesium alloy. Optical microscopy, scanning electron microscopy (SEM), and nanoindentation were used to characterize the microstructures and mechanical properties of the alloy. In addition, the wear behavior of the alloy was deduced using a pin-on disk tribological configuration under unidirectional sliding against steel (AISI 250). The elastic modulus of AZ91 alloy was found to vary significantly with changing precipitation state. The tribological evaluations showed that the specific wear-rate of solutionized sample is lowest as compared to the aged samples. This was attributed to the absence of γ-Mg17Al12 phase. Examination of worn surfaces suggested that microploughing coupled with the adhesive mode of wear is the main wear mechanism in the aged samples.

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Microstructural Changes of AZ91 Magnesium Alloy After Heat Treatment

Magnesium ◽

10.1002/3527603565.ch29 ◽

2005 ◽

pp. 196-201 ◽

Cited By ~ 1

Author(s):

Andrzej Kiełbus ◽

Lubomir Ciżek ◽

Libor Pawlica

Keyword(s):

Heat Treatment ◽

Magnesium Alloy ◽

Az91 Magnesium Alloy ◽

Microstructural Changes ◽

Az91 Magnesium

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Corrosion Resistance of Al-12Si Coatings on AZ91 Magnesium Alloy Prepared through Flame Spray

Materials Science Forum ◽

10.4028/www.scientific.net/msf.765.639 ◽

2013 ◽

Vol 765 ◽

pp. 639-643 ◽

Cited By ~ 1

Author(s):

Pei Hu Gao ◽

Jian Ping Li ◽

Zhong Yang ◽

Yong Chun Guo ◽

Yan Rong Wang

Keyword(s):

Heat Treatment ◽

Corrosion Resistance ◽

Magnesium Alloy ◽

Coating Thickness ◽

Corrosion Potential ◽

Treatment Temperature ◽

Phase Changes ◽

Flame Spray ◽

Az91 Magnesium Alloy ◽

Az91 Magnesium

In this study, Al-12Si alloy coatings with different thickness were prepared through flame spray on the surface of the AZ91 magnesium alloy to improve its corrosion resistance. The corrosion resistance was characterized through corrosion potential using electrochemical methods. The Al-12Si alloy coatings were heat treated at 100 °C, 200 °C and 300 °C for 6, 12, 18 and 24 hours. The effects of heat treatment temperature and time on the coatings’ corrosion resistance were discussed. It was found that there were no phase changes during the deposition of Al-12Si coatings through flame spray and heat treatment. The greater the coating thickness was, the higher the corrosion potential was. After annealing, the inner microstructure of the Al-12Si coating was densified furtherly and the annealed coatings had higher corrosion potential and better corrosion resistance. The coating annealed at 100 °C for 18 hours had the highest corrosion potential and the best corrosion resistance in the same coating thickness.

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Effects Of Aluminum Sputtering On The Corrosion Resistance Of AZ91 Alloy

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0237 ◽

2015 ◽

Vol 60 (2) ◽

pp. 953-955 ◽

Cited By ~ 4

Author(s):

Y. Ishibashi ◽

M. Nose ◽

M. Hatakeyama ◽

S. Sunada

Keyword(s):

Heat Treatment ◽

Corrosion Resistance ◽

Magnesium Alloy ◽

Az91 Alloy ◽

Az91 Magnesium Alloy ◽

Eds Analysis ◽

Heat Treated ◽

Film Forming ◽

Az91 Magnesium ◽

Aluminium Film

Abstract The corrosion resistance of a Magnesium alloy is low and needs to be improved. This research aimed at corrosion-resistance improvement by supatterd deposition aluminium film, which is formed on the surface of AZ91 Magnesium-alloy. Corrosion resistance performed polarization curve measurement, was evaluated in quest of the corrosion rate using the Tafel extrapolation method, and conducted surface observation and EDS analysis by SEM. Although corrosion resistance is not improved only by film forming because of defects in film, corrosion resistance is improved by heat treatment for 3 hours by 553K after sputtering. In the case of heat treated at 623K and 673K for 3 hours, magnesium diffuses through the alminium film and reached the surface of the film. Thus, heat treatment at high temperature degrade the corrosion resistance of the film. The optimization of heat treatment after sputtering is important in this method.

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