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Metals 2017, 7(2), 62; doi:10.3390/met7020062

Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy

1
Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, China
2
School of Mechanical Science and Engineering, Jilin University, Changchun 130025, China
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 22 December 2016 / Revised: 13 February 2017 / Accepted: 14 February 2017 / Published: 20 February 2017
(This article belongs to the Special Issue Fatigue Damage)
View Full-Text   |   Download PDF [5661 KB, uploaded 20 February 2017]   |  

Abstract

High-frequency impacting and rolling was applied on AZ31B magnesium alloy to obtain a gradient nano-structured surface. Surface characteristics were experimentally investigated, and the nanocrystallization mechanism is discussed in detail. Results showed that the gradient nano-structure with the characteristics of work hardening, compressive residual stress and a smooth surface was induced on the treated surface. Grains on the top surface were generally refined to around 20 nm. Twins, dislocations and dynamic recrystallization dominated the grain refinement process. Fatigue strength of the treated specimens corresponding to 107 cycles was increased by 28.6% compared to that of the as-received specimens. The work hardened layer induced by high-frequency impacting and rolling is the major reason to improve fatigue life. View Full-Text
Keywords: severe plastic deformation; hardening; twins; fatigue; compressive residual stress; nanocrystallization severe plastic deformation; hardening; twins; fatigue; compressive residual stress; nanocrystallization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, X.; Zhang, Y.; Liu, Y. Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy. Metals 2017, 7, 62.

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