Microstructure, Mechanical Properties and Corrosion Behavior of Extruded Mg-Zn-Ag Alloys with Single-Phase Structure

作者：Zhao, Hong; Wang, Li-Qing; Ren, Yu-Ping^*; Yang, Bo; Li, Song; Qin, Gao-Wu^*

来源：Acta Metallurgica Sinica (English Letters), 2018, 31(6): 575-583.

DOI：10.1007/s40195-018-0712-x

• Mg-Zn-Ag
• Single phase
• Backward extrusion
• Mechanical performance
• Corrosion behavior

Mg-Zn-Ag alloys have been extensively studied in recent years for potential biodegradable implants due to their unique mechanical properties, biodegradability and biocompatibility. In the present study, Mg-3Zn-xAg (wt%, x = 0.2, 0.5 and 0.8) alloys with single-phase crystal structure were prepared by backward extrusion at 340 degrees C. The addition of Ag element into Mg-3Zn slightly influences the ultimate tensile strength and microstructure, but the elongation firstly increases from 12% to 19.8% and then decreases from 19.8% to 9.9% with the increment of Ag concentration. The tensile yield strength, ultimate tensile strength and elongation of Mg-3Zn-0.2Ag alloy reach up to 142, 234 MPa and 19.8%, respectively, which are the best mechanical performance of Mg-Zn-Ag alloys in the present work. The extruded Mg-3Zn-0.2Ag alloy also possesses the best corrosion behavior with the corresponding corrosion rate of 3.2 mm/year in immersion test, which could be explained by the single-phase and uniformly distributed grain structure, and the fewer twinning.

• 出版日期2018-6
• 单位东北大学