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Tribological Behavior and the Mild–Severe Wear Transition of Mg97Zn1Y2 Alloy with a LPSO Structure Phase

by Wei Sun 1,2, Xihua Xuan 3, Liang Li 1,2 and Jian An 1,2,*
1
Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China
2
Department of Materials Science and Engineering, Jilin University, Changchun 130025, China
3
Chery Jaguar Land Rover Automotive Co., Ltd., Changshu 215513, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 505; https://doi.org/10.3390/ma11040505
Received: 11 March 2018 / Revised: 26 March 2018 / Accepted: 27 March 2018 / Published: 27 March 2018
(This article belongs to the Section Structure Analysis and Characterization)
Dry friction and wear tests were performed on as-cast Mg97Zn1Y2 alloy using a pin-on-disc configuration. Coefficients of friction and wear rates were measured as a function of applied load at sliding speeds of 0.2, 0.8 and 3.0 m/s. The wear mechanisms were identified in the mild and severe wear regimes by means of morphological observation and composition analysis of worn surfaces using scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS). Analyses of microstructure and hardness changes in subsurfaces verified the microstructure transformation from the deformed to the dynamically recrystallized, and properties changed from the strain hardening to dynamic crystallization (DRX) softening before and after the mild–severe wear transition. The mild–severe wear transition can be determined by a proposed contact surface DRX temperature criterion, from which the critical DRX temperatures at different sliding speeds are calculated using DRX dynamics; hence transition loads can also be calculated using a transition load model. The calculated transition loads are in good agreement with the measured ones, demonstrating the validity and applicability of the contact surface DRX temperature criterion. View Full-Text
Keywords: magnesium alloys; tribological behavior; wear maps; mild-severe wear transition; dynamic recrystallization magnesium alloys; tribological behavior; wear maps; mild-severe wear transition; dynamic recrystallization
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Sun, W.; Xuan, X.; Li, L.; An, J. Tribological Behavior and the Mild–Severe Wear Transition of Mg97Zn1Y2 Alloy with a LPSO Structure Phase. Materials 2018, 11, 505.

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