Effect of Twin-Induced Texture Evolution on Corrosion Resistance of Extruded ZK60 Magnesium Alloy in Simulated Body Flui
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JMEPEG https://doi.org/10.1007/s11665-020-05068-2
Effect of Twin-Induced Texture Evolution on Corrosion Resistance of Extruded ZK60 Magnesium Alloy in Simulated Body Fluid Ying Xiong
, Tao Zhu, Jie Yang, Yi Yu, and Xinghua Gong
(Submitted May 12, 2020; in revised form July 25, 2020) Different pre-compression deformations are carried out along the extrusion direction of ZK60 magnesium alloy to change the initial texture of the material. The corrosion resistance of ZK60 magnesium alloy associated with twin-induced texture evolution was investigated by immersion and electrochemical experiments in simulated body fluid (SBF). The results showed that a small amount of twins decreased corrosion resistance, while high density twins improved the corrosion resistance of the material. Keywords
corrosion resistance, magnesium alloy, orientation, texture, twinning
1. Introduction Magnesium alloys are considered as promising biomedical implant material which replaces traditional stainless steel and titanium alloy because of its good biocompatibility, biodegradability and similar mechanical properties to human bone (Ref 1). The temporary implant made of magnesium alloy can avoid the damage caused by secondary surgery. However, the rapid corrosion rate of magnesium alloy in physiological environment is the main problem hindering its clinical application (Ref 2). In the corrosive fluid environment, magnesium alloy implants may lose their mechanical integrity before tissue healing. In the past few decades, researchers have developed various surface modification methods to improve the corrosion resistance of magnesium alloys (Ref 3, 4). In order to realize the successful use of magnesium alloy implants in human body, it is necessary not only to control the corrosion rate of material by surface modification technology, but also to understand the effect of microstructure on corrosion behavior. Previous studies have focused on the effects of impurity elements (Ref 5-8), second phase (Ref 9-12) and grain size (Ref 13-15) on the corrosion properties of magnesium alloys. Due to strong crystallographic texture formed in extruded or rolled magnesium alloys during plastic deformation, corrosion anisotropy will be unavoidable. It was found that the crystallographic texture has a significant influence on corrosion properties of Ying Xiong, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China; and Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou 310023, China; and Tao Zhu, Jie Yang, Yi Yu, and Xinghua Gong, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China. Contact e-mail: [email protected].
Journal of Materials Engineering and Performance
magnesium alloys (Ref 16-23). Different orientated crystallographic planes exhibited corrosion anisotropy. It is well known that implants are subjected to mechanical stress in actual service. The previous rese
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