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Ratcheting behavior of ZEK100 magnesium alloy with various loading conditions and different immersing time

Published online by Cambridge University Press:  17 April 2017

Hong Gao ,
Wenbo Ye ,
Zhe Zhang  and
Lilan Gao
Hong Gao*
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Wenbo Ye
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Zhe Zhang
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
Lilan Gao*
Affiliation:
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China; and School of Mechanical Engineering, Tianjin University of Technology, Tianjin 300191, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: gaolilan780921@163.com
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Abstract

It is desirable to evaluate the ratcheting behavior of biomedical magnesium under cyclic loading with and without precorrosion, due to the promising future in biomedical implant field. This study focuses on the investigation of the uniaxial ratcheting strain evolutions of ZEK100 magnesium alloy sheet under various loading conditions and different corrosion time. To illustrate the ratcheting response in detail, the effects of several factors on the ratcheting strain evolution were discussed, including mean stress, stress amplitude, specimen orientations, loading history, and precorroded duration. A series of asymmetrical multistep stress-controlled ratcheting tests were conducted. The mean stress, stress amplitude, and precorrosion duration have significant influence on the ratcheting response of material. ZEK100 magnesium alloy is sensitive to loading history. ZEK100 magnesium alloy exhibits anisotropic behavior, and it is found that the final ratcheting strain of transverse direction (TD) specimens is always larger than that of rolling direction (RD) specimens. The corrosion behavior of ZEK100 magnesium alloy in phosphate buffered solution (PBS) simulated physiological environment was also studied. The corrosion process is characterized by pitting corrosion, and the corrosion rate of material stabilizes at about 2.4 g/(m2 d) after an exponentially decrease at initial stage.

Keywords

ZEK100Mg alloyratcheting straincorrosion behaviorloading historyprecorrodedstress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 11 , 14 June 2017 , pp. 2143 - 2152
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Michele Manuel

References

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