Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

Chen, Qingqiang; Zhao, Zhihao; Zhu, Qingfeng; Wang, Gaosong; Tao, Kai

doi:10.3390/ma11020250

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…The mechanical and tribological behaviour of the MMCs has been studied to know the effect of the reinforcement. Some information concerning the wear behaviour of magnesium-based MMCs reveals that magnesium alloys’ tribological properties can be improved with the addition of hard ceramic fibre or particulates reinforcements [ 27 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Variation of SiC Reinforcement on Wear Behaviour of AZ91 Alloy Composites

Kumar

Mukhopadhyay

et al. 2021

Materials

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In this investigation, the extensive wear behaviour of materials was studied using SiC reinforced magnesium alloy composites fabricated through the stir casting process. The wear properties of AZ91 alloy composites with a small variation (i.e., 3%, 6%, 9% and 12%) of SiC particulates were evaluated by varying the normal load with sliding velocity and sliding distance. The worn surfaces were examined by scanning electron microscope to predict the different wear mechanisms on the pin while sliding on the hard disk in the dry sliding wear test condition. The microhardness of the SiC reinforced AZ91 composites was found to be more than the un-reinforced AZ91 alloy. Pins tested at load 19.62 N, and 2.6 m/s exhibited a series of short cracks nearly perpendicular to the sliding direction. At higher speed and load, the oxidation and delamination were observed to be fully converted into adhesion wear. Abrasion, oxidation, and delamination wear mechanisms were generally dominant in lower sliding velocity and lower load region, while adhesion and thermal softening/melting were dominant in higher sliding velocity and loads. The wear loss, wear rate and coefficient of friction of the SiC reinforced composites were lower than that of the unreinforced alloy. This is due to the fact of higher hardness exhibited by the composites. The wear behaviour at the velocity of 1.39 m/s was dominated by oxidation and delamination wear, whereas at the velocity of 2.6 m/s the wear behaviour was dominated by abrasion and adhesion wear. It was also found that the plastic deformation and smearing occurred at higher load and sliding velocity.

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Section: Introductionmentioning

confidence: 99%

Effect of Variation of SiC Reinforcement on Wear Behaviour of AZ91 Alloy Composites

Kumar

Mukhopadhyay

et al. 2021

Materials

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“…Zafari et al [12] compared the wear resistance of as-cast AZ91 magnesium alloy and AZ91 + 3 wt% RE at different temperatures. The addition of RE elements had a negative impact on the wear resistance of the magnesium alloy under a load of 20 N and temperatures of less than 100 • C. A similar phenomenon was observed with cerium-doped AZ91 alloy [13]. However, reduced wear resistance typically causes only slight wear and the mass loss generated by this additional wear is also small.…”

Section: Introductionmentioning

confidence: 52%

Investigation of the Wear Behavior of Surface Welding AZ91 and AZ91+Gd Alloys under Variable Loading Conditions

Chen

Sun

et al. 2021

Crystals

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Adding rare earth elements to magnesium alloys is an effective way to improve their wear resistance. However, the effect achieved is closely related to the friction condition. In this paper, two different types of welding wires, AZ91 magnesium alloy and AZ91 + gadolinium (Gd), were used for surface welding. Dry sliding friction and wear experiments were performed on the surfacing alloys using the pin-on-disc test. The effects of Gd addition on the wear resistance and wear mechanism of the alloy were systematically studied under low to high loads. The results show that as the load increases, the friction coefficient of the surfacing AZ91 alloy gradually decreases as the wear rate increases. A mild–severe wear transition occurred at 100 N. The addition of Gd only slightly increased the wear rate under a load of 15 N. The wear rate was significantly decreased with loads in the range of 30 to 100 N and mild–severe wear transition was avoided. The influence of both Gd addition and load on the wear mechanism were considered. The overall wear resistance of the surfacing magnesium alloy was determined.

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“…Feng [52] and other authors [53,54] report that during friction and wear tests, intermetallic phases are, in the case of AZ-based Mg alloys, a ready source of cracks at the solid solution α-Mg/intermetallic phase interface due to the fact that the intermetallic phases (especially β-Mg17(Al,Zn)12 and Al8Mn5 phases) are more brittle than the surrounding matrix α-Mg. In addition, for AZ91 alloy, the β-Mg17(Al,Zn)12 phase loses adhesion to the surrounding α-Mg matrix during plastic deformation.…”

Section: Tribological Behaviourmentioning

confidence: 99%

Effect of Laser Remelting of Fe-Based Thermally Sprayed Coating on AZ91 Magnesium Alloy on Its Structural and Tribological Properties

Buchtík,

Březina,

Mrňa

et al. 2023

Coatings

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An Fe-based coating was thermally sprayed onto the surface of AZ91 magnesium alloy via the High-Velocity-Oxygen-Fuel (HVOF) method. The thermally sprayed coating with a thickness of 530 ± 25 µm and a porosity of 0.7 ± 0.1% did not show any macrostructural defects and did not cause any degradation of the AZ91 alloy. Laser remelting of the surface layer of the sprayed coating resulted in the recrystallization of the structure and the disappearance of presented pores, splat boundaries, and other defects. This led to an increase in the hardness of the remelted layer from the original 535 ± 20 HV0.3 up to 625 ± 5 HV0.3. However, during the laser remelting at a laser power of 1000 W, stress cracking in the coating occurred. The tribological properties were evaluated by the ball-on-plate method under dry conditions. Compared to the uncoated AZ91 magnesium alloy, a higher value of friction coefficient (COF) was measured for the as-sprayed coating. However, there was a decrease in wear rate and weight loss. The remelting of the surface layer of the as-sprayed coating led to a further decrease in the wear rate and weight loss. Based on the obtained data, it has been shown that the application of laser-remelted thermally sprayed Fe-based coatings on AZ91 Mg alloy improves hardness and tribological properties compared to bare Mg alloy and as-sprayed Fe-based coatings.

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Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

Cited by 9 publications

References 27 publications

Effect of Variation of SiC Reinforcement on Wear Behaviour of AZ91 Alloy Composites

Effect of Variation of SiC Reinforcement on Wear Behaviour of AZ91 Alloy Composites

Investigation of the Wear Behavior of Surface Welding AZ91 and AZ91+Gd Alloys under Variable Loading Conditions

Effect of Laser Remelting of Fe-Based Thermally Sprayed Coating on AZ91 Magnesium Alloy on Its Structural and Tribological Properties

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