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| 热挤压与高温再结晶退火对纯镁组织及腐蚀性能的影响 |
| Effect of Hot Extrusion and High-temperature Recrystallisation Annealing on Microstructure and Corrosion Resistance of Pure Magnesium |
| Received:July 26, 2024 |
| DOI：10.3969/j.issn.1674-6457.2025.05.003 |
| 中文关键词: 纯镁 热挤压 退火 再结晶 腐蚀率 |
| 英文关键词: pure magnesium hot extrusion annealing recrystallisation corrosion rate |
| 基金项目:江西省科技厅重点项目(HX202111260001);井冈山大学博士科研启动项目(JZB2018);江西省教育厅科学技术研究项目(GJJ201032);吉安市重大科技专项(吉财教指[2022]4号) |
| Author Name | Affiliation | | YU Anshan | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China
Key Laboratory of Jiangxi Province for Modern Agricultural Equipment, Jinggangshan University, Jiangxi Ji'an 343009, China
Dongguan EONTEC Co., Ltd., Guangdong Dongguan 523662, China | | YANG Xiangjie | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China | | LI Weirong | Dongguan EONTEC Co., Ltd., Guangdong Dongguan 523662, China | | LI Kun | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
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| 中文摘要: |
| 目的 研究纯镁在350、400、450 ℃挤压温度下的变形特征、高温快速静态再结晶退火下的微观组织演变及浸泡腐蚀性能。方法 采用金相显微镜分析微观组织演变、统计晶粒尺寸及分布规律，以生理盐水模拟体液腐蚀环境，测得pH值并计算腐蚀率的变化规律。结果 挤压后的镁棒为由变形晶粒和部分动态再结晶晶粒组成的混晶组织，随着挤压温度的升高，动态再结晶晶粒数量增多。热处理后的镁棒发生了明显的静态再结晶，相对于挤压后组织腐蚀性能的提高，400 ℃挤压后静态再结晶晶粒出现异常长大的现象，组织均匀性变差，腐蚀性能下降，而450 ℃挤压后静态再结晶组织细小且均匀，平均晶粒尺寸为38.5 µm，生理盐水中腐蚀率低于1 mm/a。结论 450 ℃挤压后静态再结晶退火工艺可以有效改善变形均匀性和促进晶粒细化，明显提升纯镁耐腐蚀性能。 |
| 英文摘要: |
| The work aims to study the deformation characteristics, the microstructural evolution during high-temperature rapid static recrystallization annealing, and the immersion corrosion properties of pure magnesium at extrusion temperatures of 350, 400 and 450 ℃. The microstructural evolution was analyzed with a metallurgical microscope, and the grain size and distribution were determined statistically. The physiological saline was used to simulate the corrosive environment of body fluids and the pH value was measured to calculate the variation in corrosion rate. The extruded magnesium bars exhibited a mixed microstructure comprising deformed grains and partially dynamically recrystallised grains. The increasing extrusion temperature resulted in an increase in the number of grains subject to dynamic recrystallization. Following heat treatment, the magnesium bars underwent substantial static recrystallisation, resulting in enhanced corrosion resistance in comparison to the extruded microstructure. Nevertheless, aberrant grain growth occurred during static recrystallisation subsequent to extrusion at 400 ℃, resulting in the most pronounced microstructural inhomogeneity and diminished corrosion resistance. In contrast, the static recrystallised microstructure after extrusion at 450 ℃ was characterized by fine and uniform grains, with an average grain size of 38.5 µm and a corrosion rate in physiological saline below 1 mm/a. The static recrystallisation annealing process after extrusion at 450 ℃ is an effective method for improving deformation uniformity and promoting grain refinement, which significantly enhances the corrosion resistance of pure magnesium. |
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