Effect of extrusion process on microstructure and properties of AZ80NC degradable magnesium alloy

doi:10.13251/j.issn.0254-6051.2025.03.006

Abstract

Abstract: Effects of extrusion temperature and speed on microstructure, mechanical properties and dissolution properties of the AZ80NC degradable magnesium alloy were investigated. The results show that the as-cast microstructure of the AZ80NC alloy consists of α-Mg matrix and secondary phases including β-Mg₁₇Al₁₂, MgAlNi and MgAlCu. During hot extrusion at temperatures above 300 ℃, complete dynamic recrystallization occurs in the extruded rods of the AZ80NC alloy, resulting in an equiaxed grain microstructure. Under low temperature and low strain rate extrusion, partial recrystallization occurs at the edges of the extruded rods, forming a bimodal grain microstructure. As the extrusion temperature and extrusion rate decrease, the yield strength and tensile strength of the AZ80NC alloy gradually increase, while the elongation and corrosion rate decrease. However, when a bimodal grain microstructure is formed under low temperature and low strain rate extrusion, the alloy exhibits both high strength and high ductility, with higher corrosion rate reaching a maximum of 31.18 mg/(cm²·h).

Key words: degradable magnesium alloy, extrusion process, mechanical properties, dissolution properties

CLC Number:

Zhou Xiaozhou, Meng Li, Xu Jiangjie, Zhang Ning, Tu Yang, Fu Chao, Yang Yong. Effect of extrusion process on microstructure and properties of AZ80NC degradable magnesium alloy[J]. Heat Treatment of Metals, 2025, 50(3): 38-43.

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