A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

Acta Metallurgica Sinica (English Letters) - Tập 33 - Trang 1191-1200 - 2020
He Huang1, Huan Liu1,2, Li-Sha Wang1, Yu-Hua Li1,3, Solomon-Oshioke Agbedor1, Jing Bai4, Feng Xue4, Jing-Hua Jiang1
1College of Mechanics and Materials, Hohai University, Nanjing, China
2Ocean and Coastal Engineering Research Institute, Nantong, China
3Suqian Research Institute of Hohai University, Suqian, China
4College of Materials Science and Engineering, Southeast University, Nanjing, China

Tóm tắt

In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn–1.6Mg (wt%) alloy during multi-pass rotary die equal channel angle pressing (RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg2Zn11 + MgZn2 ternary eutectic structure was formed in as-cast Zn–Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization (DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn–Mg alloy was successfully developed without sacrifice of the corrosion resistance.

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Acta Metallurgica Sinica (English Letters)

Tập 33

1191-1200

Thông tin tác giả