Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy
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 cha...
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doaj-bb1bc68df7a4434792be6b6c127178292020-11-25T00:16:00ZengMDPI AGMetals2075-47012017-02-01726210.3390/met7020062met7020062Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium AlloyXiaohui Zhao0Yanjun Zhang1Yu Liu2Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, ChinaKey Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun 130025, ChinaSchool of Mechanical Science and Engineering, Jilin University, Changchun 130025, ChinaHigh-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.http://www.mdpi.com/2075-4701/7/2/62severe plastic deformationhardeningtwinsfatiguecompressive residual stressnanocrystallization |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiaohui Zhao Yanjun Zhang Yu Liu |
spellingShingle |
Xiaohui Zhao Yanjun Zhang Yu Liu Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy Metals severe plastic deformation hardening twins fatigue compressive residual stress nanocrystallization |
author_facet |
Xiaohui Zhao Yanjun Zhang Yu Liu |
author_sort |
Xiaohui Zhao |
title |
Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy |
title_short |
Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy |
title_full |
Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy |
title_fullStr |
Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy |
title_full_unstemmed |
Surface Characteristics and Fatigue Behavior of Gradient Nano-Structured Magnesium Alloy |
title_sort |
surface characteristics and fatigue behavior of gradient nano-structured magnesium alloy |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2017-02-01 |
description |
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. |
topic |
severe plastic deformation hardening twins fatigue compressive residual stress nanocrystallization |
url |
http://www.mdpi.com/2075-4701/7/2/62 |
work_keys_str_mv |
AT xiaohuizhao surfacecharacteristicsandfatiguebehaviorofgradientnanostructuredmagnesiumalloy AT yanjunzhang surfacecharacteristicsandfatiguebehaviorofgradientnanostructuredmagnesiumalloy AT yuliu surfacecharacteristicsandfatiguebehaviorofgradientnanostructuredmagnesiumalloy |
_version_ |
1725385240952700928 |