Study of Intergranular Corrosion Behaviors of Mn-Increased 5083 Al Alloy with Controlled Precipitation States of Al6Mn Formed during Homogenization Annealing
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
- (1)
- Sensitization temperature determination: Through metallographic etching, TEM observation, and NAMLT testing, it was determined that 175 °C is the sensitization temperature for the material, 200 °C is the transition temperature, and 225 °C is the stabilization temperature.
- (2)
- The changes in β phase precipitation behavior: As the temperature increases from sensitization to transition to stabilization, the precipitation behavior of the β phase changes accordingly. At the sensitization temperature, the β phase is continuously distributed along the grain boundaries; at the transition temperature, this continuous distribution weakens, with some β phase forming at the triple grain junctions; at the stabilization temperature, the β phase is almost absent at the grain boundaries.
- (3)
- The effect of Al6Mn on the β phase: the TEM observations of sensitized samples containing different Al6Mn phases showed that the β phase preferentially precipitates on plate-like Al6Mn, leading to intragranular precipitation, which improves the material’s resistance to intergranular corrosion. Further, the NAMLT testing indicated that plate-like Al6Mn can reduce the degree of sensitization by 15%.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Zhang, P.; Wang, Y.; Zhao, P.; Jiang, Z.; Tian, Y.; Yang, Y.; Han, J. Study of Intergranular Corrosion Behaviors of Mn-Increased 5083 Al Alloy with Controlled Precipitation States of Al6Mn Formed during Homogenization Annealing. Metals 2024, 14, 1053. https://doi.org/10.3390/met14091053
Zhang P, Wang Y, Zhao P, Jiang Z, Tian Y, Yang Y, Han J. Study of Intergranular Corrosion Behaviors of Mn-Increased 5083 Al Alloy with Controlled Precipitation States of Al6Mn Formed during Homogenization Annealing. Metals. 2024; 14(9):1053. https://doi.org/10.3390/met14091053
Chicago/Turabian StyleZhang, Peng, Yue Wang, Pizhi Zhao, Zhengyi Jiang, Yinbao Tian, Yang Yang, and Jian Han. 2024. "Study of Intergranular Corrosion Behaviors of Mn-Increased 5083 Al Alloy with Controlled Precipitation States of Al6Mn Formed during Homogenization Annealing" Metals 14, no. 9: 1053. https://doi.org/10.3390/met14091053