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

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Abstract:

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.

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Research in Materials and Manufacturing Technologies IV View Preview

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Periodical:

Advanced Materials Research (Volumes 1061-1062)

Pages:

674-678

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1061-1062.674

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Online since:

December 2014

Authors:

Yuan Bo Wang, Teng Fei Su, Ming Liang Yin, Xue Han, Xin Ying Li*, Ce Liang, Jian An

Keywords:

Dry Sliding Wear, Hardness, Magnesium Alloy, Surface Analysis

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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