An Investigation on Subsurface Microstructural Evolution and Mild to Severe Wear Transition in AZ51 Magnesium Alloy

2015 ◽  
Vol 58 (3) ◽  
pp. 549-559 ◽  
Author(s):  
T. F. Su ◽  
X. Han ◽  
Y. B. Wang ◽  
M. L. Yin ◽  
C. Liang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Microstructural Evolution ◽  
Severe Wear ◽  
Wear Transition

Wear Behavior and Microstructural Evolution during Dry Sliding Wear of AZ51 Magnesium Alloy

2014 ◽  
Vol 1061-1062 ◽  
pp. 674-678
Author(s):  
Yuan Bo Wang ◽  
Teng Fei Su ◽  
Ming Liang Yin ◽  
Xue Han ◽  
Xin Ying Li ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Microstructural Evolution ◽  
Wear Behavior ◽  
Thermal Softening ◽  
Surface Melting ◽  
Dry Sliding Wear ◽  
Near Surface ◽  
Severe Wear ◽  
Wear Transition ◽  
Subsurface Microstructure

Wear behavior of AZ51 magnesium alloy was studied using a pin-on-disc type wear apparatus at 20-360 N and 0.785 m/s. Wear mechanisms were determined using scanning electron microscope (SEM), including abrasion, oxidation, delamination, thermal softening and surface melting. Microstructural evolution, plastic deformation and microhardness in the subsurfaces were examined with optical microscope and hardness tester before and after mild to severe wear transition. The subsurface microstructure experienced deformation, dynamic recrystallization (DRX) and surface melting successively with increasing load. These changes in subsurface microstructure result in strain hardening and thermally-activated softening in the near-surface layers. The thermal softening originating from DRX and surface melting in subsurface is responsible for the mild to severe wear transition.

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

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 554
Author(s):  
Qingqiang Chen ◽  
Yalei Yu ◽  
Jie Sun ◽  
Cainian Jing ◽  
Yanhua Zhao ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Wear Rate ◽  
Wear Mechanism ◽  
Sliding Friction ◽  
Wear Behavior ◽  
Az91 Alloy ◽  
Severe Wear ◽  
Surface Welding ◽  
Wear Transition

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.

scholarly journals Dry Sliding Wear Behavior and Mild–Severe Wear Transition of Mg97Zn1Y2 Alloy at Elevated Temperatures

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1735 ◽  
Author(s):  
Liang Li ◽  
Jihe Feng ◽  
Ce Liang ◽  
Jian An
Keyword(s):  
Test Temperature ◽  
Sliding Wear ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Hardness Measurement ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Softening Effect ◽  
Severe Wear ◽  
Wear Transition

Dry sliding wear behavior of Mg97Zn1Y2 alloy was investigated at test temperatures of 50–200 °C under three sliding speeds of 0.8 m/s, 3.0 m/s and 4.0 m/s. The wear mechanisms in mild and severe wear regimes were identified by examination of morphologies and compositions of worn surfaces using scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS), and from which wear transition maps under different sliding speeds were constructed on rectangular coordinate systems with applied load versus test temperature axes. It is found that under each sliding speed condition, mild–severe transition load decreases almost linearly within the test temperature range of 50 °C to 200 °C. Microstructure observation and hardness measurement in subsurfaces identify that the softening effect generating form dynamic crystallization (DRX) is the dominant mechanism for the mild–severe wear transition at elevated temperatures. The mild–severe wear transition at 50–200 °C follows the contact surface DRX temperature criterion, and the transition loads can be well evaluated using the criterion.

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